CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics

28 May 2018, 14:00 → 3 Jun 2018, 13:00 US/Pacific

Hyatt Regency Indian Wells Conference Center

Wick Haxton (UC Berkeley)

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The Poster Session is on Friday at 18:30–19:30 immediately before the Conference Banquet.

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Monday, 28 May

Registration Desk: Open 16:00 – 20:00

Tuesday, 29 May

Registration Desk: Open 07:00 – 18:00

Plenary 1: Opening | Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity | Special Topic

Convener: Prof. Willem van Oers (U. Manitoba/TRIUMF)

1 Opening

I will welcome the participants of CIPANP 2018 and briefly review the history of this meeting that strives to strengthen the connections between nuclear, particle, and astro physicists.

Speaker: Prof. Wick Haxton (UC Berkeley and LBNL)

Slides 0-0-CIPANP_Haxton_Opening.pdf 0-3-CIPANP_Haxton_Opening.key

2 New Results from the Dark Energy Survey and the South Pole Telescope

Astronomical surveys that map the cosmic microwave background (CMB) and the distribution of large scale structure of the Universe have demonstrated an impressive ability to constrain cosmology and to probe fundamental physics. In this talk, I will present an overview of recent results from the South Pole Telescope, which maps the CMB at small angular scales, and the Dark Energy Survey, which measures large scale structure via the positions of galaxies and weak gravitational lensing. Both experiments have already yielded exciting cosmological and astrophysical constraints, and are poised to advance these constraints significantly in the near future.

Speaker: Eric Baxter (University of Pennsylvania)

Slides 219-0-baxter_CIPAN2018.pdf

3 Theories of Cosmic Acceleration

I will survey our understanding of cosmic acceleration, both in the late and early universe. The focus will be on recent theoretical developments in the study of dark energy and in the physics of inflation. We will also discuss constraints both from current and future observations.

Speaker: Dr Austin Joyce (Columbia University)

Slides 261-0-Joyce_-_CIPANP.pdf

4 Recent Developments in the Proton Radius Puzzle

The CODATA-recommended value of the proton rms charge radius $r_p$ is based on hydrogen/deuterium spectroscopy and electron–proton/deuteron scattering experiments. Since 2010, a discrepancy between the $r_p$ value determined from muonic hydrogen spectroscopy and the CODATA-recommended value has led to intense research activity both in theory and experiment. The situation has recently become even more puzzling as a contradiction appeared between two new hydrogen spectroscopy results: the 2S-4P transition frequency [Beyer $\textit{et al.}$, Science 358, 2017] agrees with the muonic $r_p$ value, while the 1S-3S transition frequency presented here supports the CODATA value. In our experiment at Laboratoire Kastler Brossel (Paris, France), the two-photon 1S-3S hydrogen transition is excited in an atomic beam, with a continuous-wave 205-nm laser obtained by sum frequency generation in a non-linear crystal. The transition frequency is measured with respect to the LNE-SYRTE Cs clock by means of a frequency comb. The second-order Doppler shift and other systematic effects have been included in the analysis to determine the 1S-3S transition frequency with a relative uncertainty of $9\times10^{-13}$ [Fleurbaey $\textit{et al.}$, PRL accepted for publication, 2018]. The value of the proton radius which can be inferred is in very good agreement with the CODATA-recommended value. In this talk, I will present the current situation of the proton radius puzzle and our latest results.

Speaker: Helene Fleurbaey (NIST)

Slides 223-0-Fleurbaey_29May18.pptx

09:50 Break

Plenary 2: Physics at High Energies | QCD, Hadron Spectroscopy, and Exotics

Convener: Dr Richard Mischke (TRIUMF)

5 Frontiers in Electroweak Symmetry Breaking

The Higgs discovery changed our understanding of electroweak symmetry breaking, and the current theoretical focus is on illuminating the properties of the Higgs boson. I will discuss the Standard Model Higgs sector as the low energy limit of unknown high scale physics and present the status of theoretical calculations in the electroweak symmetry breaking sector and prospects for future discoveries.

Speaker: Dr Sally Dawson (BNL)

Slides 67-3-cipanp_2018_dawson.pdf

6 Latest LHC Results

This talk highlights recent results from the LHC experiments, and briefly describes the prospects for the future measurements.

Speaker: Petar Maksimovic (Johns Hopkins University)

Slides 343-0-Maksimovic_cipanp18.pdf

7 Recent Progress in Hadron Spectroscopy Using Lattice QCD

Lattice QCD has matured to a degree where it is now possible to study excited hadrons as they truly appear in nature, as short-lived resonant enhancements decaying into multiple possible final states. Through variational analysis of matrices of correlation functions computed with large bases of interpolating fields it has proven possible to extract many excited state energy levels, and these can be used to constrain the hadron-hadron scattering amplitudes in which hadron resonances can be observed. I will illustrate recent progress with several examples including coupled-channel scattering in the $\pi \eta / K\bar{K}$ and $\pi\pi, K\bar{K}, \eta \eta$ systems in which the $a_0, f_0$ mesons appear.

Speaker: Jozef Dudek (William & Mary / Jefferson Lab)

Slides 69-1-2018_CIPANP_Dudek.pdf

8 Recent Results from GlueX

The GlueX experiment is located in the recently constructed experimental Hall D at Jefferson Lab (JLab), and provides a unique capability to search for hybrid mesons in high-energy photoproduction, utilizing a 9 GeV linearly polarized photon beam. Commissioning of the Hall D beamline and GlueX detector was recently completed and the data collected in the spring of 2017 officially began the GlueX physics program. The statistical precision of this initial dataset surpasses the previous world data on polarized photoproduction in this energy domain by orders of magnitude. First results from this dataset will be presented along with the plan for acquiring higher statistics datasets to begin the search for hybrid mesons at GlueX.

Speaker: Prof. Justin Stevens (William & Mary)

Slides 82-0-cipanp_gluex.pdf

12:30 Lunch

Dark Matter: Parallel 1 — Dark Matter and Hadronic Systems

Convener: Reina Maruyama (Yale University)

9 Dark Matter Interpretation of the Neutron Decay Anomaly

There is a long-standing discrepancy between the neutron lifetime measured in beam and bottle experiments. We propose to explain this anomaly by a dark decay channel for the neutron, involving one or more dark sector particles in the final state. If any of these particles are stable, they can be the dark matter. We construct representative particle physics models consistent with all experimental constraints.

Speaker: Dr Bartosz Fornal (University of California, San Diego)

Slides 32-0-B_Fornal.pptx

10 Search for Dark Matter Decay of the Free Neutron from the UCNA Experiment: $n \to \chi+e^+e^-$

The neutron lifetime is currently measured by two different types of experiments: "beam" and "bottle". These two measurement techniques have a $4 \sigma$ discrepancy in measured lifetime. It has been proposed recently that a previously unobserved neutron decay branch to a dark matter particle ($\chi$) could account for the discrepancy in the neutron lifetime observed in experiments that use two different measurement techniques. One of the possible final states discussed includes a single $\chi$ along with an $e^+e^-$ pair. We use data from the UCNA (Ultracold Neutron Asymmetry) experiment to set limits on this decay channel. Coincident electron-like events are detected with $\approx4\pi$ acceptance using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). The summed kinetic energy ($E_{e^+e^-}$) from such events is used to set limits, as a function of the $\chi$ mass, on the branching fraction for this decay channel. For $\chi$ masses consistent with resolving the neutron lifetime discrepancy, we exclude this as the dominant dark matter decay channel at $\approx5\sigma$ level for 100 keV $< E_{e^+e^-} < 644$ keV. If the $\chi+e^+e^-$ final state is not the only one, we set limits on its branching fraction of $< 10^{-4}$ for the above $E_{e^+e^-}$ range at $>90$% confidence level.

Speaker: Dr Christopher Swank (Caltech)

Slides 58-0-SwankNeutronDarkDecayee2018.pdf

11 Dark Decay of the Neutron

New decay channels for the neutron into dark matter and other particles have been suggested for explaining a long-standing discrepancy between the neutron lifetime measured from trapped neutrons versus those decaying in flight. Many such scenarios are already ruled out by their effects on neutron stars, and the decays into dark matter plus photon or electron-positron pair have been experimentally excluded. In this talk, I will present a scenario in which the neutron decays into two invisible particles: a dark Dirac fermion and a dark photon. This setup can be consistent with all constraints if the fermion is a subdominant component of the dark matter. I will discuss the limits on the model’s parameter space that are derived from the existence of two solar mass neutron stars, direct and indirect dark matter detection, supernova observations, and cosmological considerations.

Speaker: Dr Jonathan Cornell (McGill University)

Slides 21-0-Cornell_Dark_Neutron.pdf

12 Composite Dark Matter

Models of composite dark matter, originating from a new strongly coupled dark sector, have a very interesting phenomenology for particles with mass around the hundreds of GeVs. To make robust predictions in these models one often needs to investigate non-perturbative effects due to the strong self interactions. Lattice field theory methods and numerical simulations are well suited for this task and contribute to a solid uncertainty quantification. I will review the advances of lattice field theory techniques relevant for searches of dark matter particles.

Speaker: Dr Enrico Rinaldi (RIKEN-BNL)

Slides 99-0-latticeDMbounds_Rinaldi_20mins.pdf

13 Sexaquark Dark Matter

A stable sexaquark ($S$) composed of $uuddss$ is a compelling Dark Matter candidate and would not have been discovered in accelerator experiments to date. I will briefly review its particle properties, why the $S$ would have eluded searches for an H-dibaryon, and analyses of Upsilon decay and LHC data suitable to discovering it (as are now underway by BABAR, Belle, CMS and LHCb). The main focus of the talk will be direct detection constraints on $S$ Dark Matter, and two major cosmological consequences: predicted $\Omega_{DM}/\Omega_b = 4.5-6$, in excellent agreement with the $5.3 \pm 0.1$ observed, and $^7$Li abundance in agreement with observation (which is $\sim10\sigma$ below the standard LCDM prediction). For the relevant parameter space of $S$ interactions with nucleons via $\omega$–$\phi$ and $f_0$ meson exchange, the Born Approximation does not apply. This requires a complete re-evaluation of Direct Detection experiments, as will be reported. Time permitting, possible additional astrophysical consequences will be discussed.

Speaker: Glennys Farrar (NYU)

Slides 359-0-CIPANP_SDM_052918.pdf 359-1-farrar_SDM_CIPANPsummary.pdf

HFCKM / PPHI: Parallel 1 — Rare Decays

Convener: Wolfgang Altmannshofer (University of Cincinnati)

14 Rare Decays Probing Physics Beyond the Standard Model

The existence of three generations of fundamental fermions gives rise to a wealth of phenomena, such as CP violation and flavour oscillations. Because of various conservation laws, including baryon number, lepton number and charged lepton flavour conservation, many otherwise possible reactions, asymmetries, and decays are prohibited or strongly suppressed. The search for rare decays helps to explore the range of validity of such laws and, once observed, rare decays may guide in identifying possible physics not yet incorporated in the Standard Model. An overview of characteristic searches and typical approaches will be presented.

Speaker: Dr Gerco Onderwater (University of Groningen)

Slides 322-0-CIPANP2018_Onderwater_RareDecays-v2.pdf

15 $B\to \pi\ell\ell$ and $B\to K\ell\ell$ Decay Form Factors from Lattice QCD

A review of recent lattice QCD calculations of the exclusive rare $B$ decay form factors is presented. Special focus is given to $B\to \pi\ell\ell$ and $B\to K\ell\ell$ decays. These flavor-changing-neutral-current processes provide theoretically clean windows into physics beyond the Standard Model.

Speaker: Dr Yuzhi Liu (Indiana University Bloomington)

Slides 218-0-CIPANP2018_Yuzhi_Liu.pdf

16 Search for LNV by the NA48 Experiment

In 2003–2004 the NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles. A new upper limit on the rate of the lepton number violating decay $K^\pm \to \pi^\mp\mu^\pm\mu^\pm$ is reported: $B(K^\pm \to \pi^\mp\mu^\pm\mu^\pm) < 8.6\times10^{−11}$ at 90% CL. Searches for two-body resonances $X$ in $K^\pm \to \pi\mu\mu$ decays (such as heavy neutral leptons N4 and inflatons $\chi$) are also presented. In the absence of signals, upper limits are set on the products of branching fractions $B(K^\pm \to \mu^\pm N4)\cdot B(N4 \to \pi\mu)$ and $B(K^\pm \to \pi^\pm X)\cdot B(X \to \mu^+\mu^-)$ for ranges of assumed resonance masses and lifetimes. The limits are in the ($10^{−11},10^{−9}$) range for resonance lifetimes below 100 ps.

Speaker: Dr Cristina Biino (INFN Torino)

Slides 282-0-CIPANP2018_LNV@NA48_NA62_Biino.pdf

17 Search for $K^+\to \pi^+ \nu\nu$ at CERN

The decay $K^+\to \pi^+ \nu\nu$, with a very precisely predicted branching ratio of less than $10^{-10}$, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. The NA62 experiment at the CERN SPS is designed to measure the branching ratio of the $K^+\to \pi^+ \nu\nu$ with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and another year run is scheduled in 2018. Statistics collected in 2016 allows NA62 to reach the Standard Model sensitivity for $K^+\to \pi^+ \nu\nu$, entering the domain of $10^{-10}$ single event sensitivity and showing the proof of principle of the experiment. The analysis data is reviewed and the preliminary result from the 2016 data set presented.

Speaker: Dr Bob Velghe (TRIUMF)

Slides 96-3-bvelghe_cipanp_2018_v3.pdf

Neutrino Masses and Neutrino Mixing: Parallel 1 — Neutrino Mass and Astrophysical Neutrinos

Convener: Daniel Dwyer

18 The KATRIN Neutrino Mass Measurement: Experiment, Status, and Outlook

The Karlsruhe Tritium Neutrino (KATRIN) experiment will provide a measurement of the effective electron-neutrino mass, $m(\nu_e)$, based on a precision measurement of the tritium beta decay spectrum near its endpoint. The effective mass is an average of the neutrino mass eigenstates $m_i$ weighted by the flavor-mass mixing parameters $U_{ei}$ according to the relation $m^2(\nu_e)=\sum_{i=1}^3 |U_{ei}|^2 m_i^2$. The KATRIN apparatus uses a windowless gas tritium source (WGTS) and a spectrometer based on the MAC-E-Filter concept to measure the beta energy spectrum. The KATRIN program is designed to reach a mass sensitivity of 0.2 eV (90 % C.L.). The collaboration has completed a series of commissioning measurements and is moving into the first running of tritium. This talk will provide an overview of the KATRIN apparatus with emphasis on the MAC-E filter. Results from the initial commissioning runs and the status of the initial tritium beta-spectrum measurements will be presented.

Speaker: Prof. Gregg Franklin (Carnegie Mellon University)

Slides 248-0-gFranklinCIPANP.pdf

19 Project 8: Cyclotron Radiation Emission Spectroscopy, a New Technique in Direct Neutrino Mass Measurement

Project 8 has demonstrated Cyclotron Radiation Emission Spectroscopy (CRES) as a novel technique for performing electron spectroscopy. Applying this method to highest energy electrons from tritium beta decay will lead to a direct neutrino mass measurement. A proof of this concept was performed with a waveguide detector utilizing conversion electrons from $^{83m}$Kr monoenergetic lines. The demonstrator has expanded our knowledge of rich spectral features in CRES signals. As a next step, we have upgraded our hardware to meet the requirements for a demonstration with tritium. Here I present both the hardware and analysis progress which will lead us to the first continuous spectrum measurement.

Speaker: Mr Ali Ashtari Esfahani (University of Washington)

Slides 180-0-CIPANP_2018.pptx

20 Recent Borexino Measurements of Solar Neutrinos from the pp-Chains with Prospects for Detection of CNO Neutrinos

Borexino is a 300-ton liquid scintillator detector located in the Gran Sasso Underground Laboratory in Italy.   This detector has been taking solar neutrino data for the past ten years, and recently completed new measurements of the pp, p$e$p, $^7$Be, and $^8$B solar neutrinos.  The data comprise the most complete direct experimental confirmation of Bethe’s 1939 theory of the pp-chains of nuclear reactions that produce the Sun’s energy.  The new data also confirm a feature of the MSW theory of neutrino oscillations which predicts a transition from “vacuum oscillations” to “matter effect oscillations” over the solar neutrino energy spectrum.  Experimental methods that achieved the ultra-low backgrounds necessary for these results will be described, as will continuing research toward lower backgrounds for a possible future observation of CNO neutrinos.

Speaker: Prof. Frank Calaprice (Princeton University)

21 Solar and Supernova Neutrino Detection in the Deep Underground Neutrino Experiment

The Deep Underground Neutrino Experiment (DUNE) is an upcoming experiment dedicated to the study of neutrino oscillation physics, nucleon decay, and supernova neutrinos. Understanding the physics of how massive stars die will lead to a better understanding of the creation of elements, properties of neutrinos, and constraints on beyond-the-Standard-Model physics. Neutrinos carry a majority of the core-collapse energy; thus, these neutrinos provide crucial information about the supernova. Solar and supernova neutrinos have much lower energies (few to 10s of MeV energy range) than those studied in the rest of DUNE's physics program. In order to extract as much information about our sun or a future supernova as possible, the DUNE collaboration has initiated various Monte Carlo simulation studies to study detector response and reconstruction ability, in order to optimize the DUNE neutrino detectors for low-energy physics. These studies improve expectations for solar and supernova neutrinos, advance the low-energy neutrino physics field, and prepare the DUNE detectors to detect these neutrinos under the most optimal circumstances.

Speaker: Ms Erin Conley (Duke University)

Slides 286-0-Conley_2018May_CIPANP.pdf

22 The Myriad Wonders and Challenges of Gd-Loading in WC Detectors

The benefits and difficulties of enriching water Cherenkov detectors with water-soluble gadolinium compounds — thereby enabling the detection of thermal neutrons and dramatically improving these devices' performance as detectors of supernova and reactor antineutrinos — will be discussed.

Speaker: Prof. Mark Vagins (Kavli IPMU/UC Irvine)

Slides 276-0-Gad_CIPANP18.pdf

Nuclear Forces and Structure, NN Correlations, and Medium Effects: Parallel 1 — Neutron-Rich Matter and the EOS

Convener: Scott Bogner (Michigan State University)

23 Laboratory Probes of the Neutron-Matter Equation of State

The nuclear Equation of State (EoS) is central to the understanding of the matter found in neutron stars and in explosive stellar environments. This includes the dynamics in neutron star mergers or core collapse supernovae in which many of the heavy elements are formed. Such environments are often neutron-rich and their description requires extrapolating the properties of neutron-rich matter from that of symmetric matter containing equal numbers of neutrons and protons. This extrapolation is governed by the nuclear symmetry energy, which can be defined to be the difference between the EoS of neutron matter and that of symmetric matter. In this talk, I will discuss the experimental probes using heavy ion collisions with different isospin reactions to explore the symmetry energy from sub-normal to supra-normal density and its implication to the tidal deformability in the neutron star merger.

Speaker: Dr Betty Tsang (Michigan State University)

Slides 165-0-iso_PalmSpring_2018_tsang.pptx

24 Overview of Experimental Data on the Neutron-Matter Equation of State and the Neutron Skins of $^{48}$Ca and $^{208}$Pb

The equation of state for asymmetric nuclear systems is a critical input for modeling a broad range of systems spanning from asymmetric nuclei to extremes such as neutron stars. Now, with the advent of gravitational wave astronomy there are new and exciting opportunities to test how these nuclei, measured on earth, connect to their astrophysical counterparts. Within nuclei, several observables are available that are sensitive to this information including the size of the neutron skins, the isovector electric dipole polarizabilities, and heavy ion isospin transport. Neutron skins in particular are notoriously difficult to observe with high precision: the standard tool of electromagnetic interactions that has been used to map out the nuclear charge distributions is simply insensitive to neutrons. Fortunately, nature provides a novel way to image this side of the nucleus: through fundamental weak force interactions, which interact primarily to neutrons rather than protons. In this talk I will review the status of the data that constrains the neutron matter equation of state and in particular discuss neutron densities, how one measures them with electron beams, and the recent and upcoming experimental efforts for such measurements.

Speaker: Dr Seamus Riordan (Argonne National Laboratory)

Slides 71-0-riordan_prex_cipanp18.pdf

25 Neutron Skins and Neutron Star Properties

The neutron skin thickness of medium to heavy nuclei provides a fundamental link between nuclear structure and neutron star properties via the equation of state of neutron-rich matter. In particular, it is strongly correlated with the pressure of a pure neutron matter which pushes against the surface tension thus allowing a finite nucleus to form a neutron skin. It is precisely this same pressure that supports a neutron star against gravitational collapse and therefore has a direct influence on the neutron-star radii, moments of inertia, tidal deformabilities, crust-core transition properties, transport properties, particle compositions and nuclear pasta phases. In this talk, I will present an overview of our recently published works on these topics. Notably, I confront the first model-independent experimental neutron skin thickness result obtained by the pioneering Lead Radius Experiment (“PREX”) at the Jefferson Laboratory against the neutron star tidal deformability that was recently measured in the historical first detection of gravitational waves from a binary neutron star merger by the LIGO-Virgo Collaboration. I will also discuss observational implications of the upcoming measurements of the neutron skin thickness by the PREX-II and CREX experiments.

Speaker: Dr Farrooh Fattoyev (Indiana University)

Slides 231-0-NeutronSkinsNeutronStars_FJFattoyev_V2.pdf

26 Nuclear-Matter Equation of State from Chiral Effective Field Theory

Nuclear matter is an ideal testbed for nuclear interactions with important consequences for nuclear astrophysics as well as finite nuclei. In particular, recent $\textit{ab initio}$ calculations of medium-mass to heavy nuclei have demonstrated the importance of realistic saturation properties of infinite matter for nuclear forces. We present an efficient Monte-Carlo framework for perturbative calculations of infinite nuclear matter based on two-, three-, and four-nucleon forces derived within chiral effective field theory. It enables to incorporate all many-body contributions in a transparent and also straightforward way, making it well-suited for pushing the limits of current state-of-the-art calculations to high orders in both the chiral as well as the many-body expansion. Furthermore, uncertainty estimates can be systematically extracted by order-by-order calculations, which provides important insights into the rate of convergence of each of the two expansions. After demonstrating its versatility, we make use of this novel framework to explore new chiral interactions up to next-to-next-to-next-to-leading order (N$^3$LO) and study the equation of state of neutron and symmetric nuclear matter. Remarkably, simultaneous fits to the triton and to saturation properties can be achieved with natural 3N low-energy couplings. Taking advantage of the framework’s efficacy, future chiral potentials may be optimized with respect to empirical saturation properties.

Speaker: Dr Christian Drischler (University of California, Berkeley and Lawrence Berkeley National Laboratory)

Slides 166-0-2018_Drischler_Nucl_Matt_EOS_slides.pdf

27 Constraining Ab Initio Models and the Nuclear Force with Rare Isotopes

Our Universe has a wide variety of visible matter. An important fundamental question is how nature combines the building blocks, protons and neutrons, to form the large variety of complex many-body nuclei. Addressing this question requires synthesizing observed properties of nuclei and predictions from theoretical models built with knowledge of the nuclear force. A complete understanding of the nuclear force remains a challenge. A major advance in this front has been the description of the nuclear force based on the chiral effective field theory. However, there are different prescriptions of the chiral interactions that need to be constrained with experiments. Rare isotopes with neutron-proton asymmetry bring in additional sensitivity in defining the force and constraining the models. This presentation will discuss how experimental investigations of static ground state nuclear properties such as masses and radii and dynamic observables such as excitation spectra and diffraction pattern in nuclear scattering have unfolded new understanding of the *ab initio* models, the nuclear forces and exhibited the crucial importance of the three-nucleon force. An outlook on future experimental prospects with rare isotopes will be presented together with the need for *ab initio* theoretical developments.

Speaker: Prof. Rituparna Kanungo (Saint Mary's University)

Particle and Nuclear Astrophysics: Parallel 1 — Neutrino Astrophysics

Conveners: Dr Barry Davids (TRIUMF), Wick Haxton

28 Astrophysical Neutrinos from IceCube

In this talk, I will present the latest results on astrophysical neutrinos from IceCube, including our non-detection of GW170817. I will also briefly present two IceCube results on the cross-section and inelasticity distributions for high-energy ($E> 1$ TeV) neutrino interactions.

Speaker: Spencer Klein

Slides 275-0-KleinIceCubeCIPANP.pdf

29 Results from ANITA

The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon payload searches for Askaryan radio emission from ultra-high-energy ($>10^{18}$ eV) neutrinos interacting in Antarctic ice. ANITA is also sensitive to geomagnetic radio emission from extensive air showers. After a brief overview of the experiment, this talk will detail recently released results from the third flight of ANITA. Updates will also be provided on ongoing analysis of ANITA-IV and future plans. The most sensitive search from ANITA-III identified one neutrino candidate with an $\textit{a priori}$ background estimate of $0.7^{+0.5}_{-0.3}$. When combined with previous flights, ANITA sets the best limits on diffuse neutrino flux at energies above $\sim10^{19.5}$ eV. While the candidate is consistent with the pre-unblinding background estimate, a neutrino interpretation of the event remains plausible even after being subjected to post-unblinding examination. Additionally, ANITA-III searches identified nearly 30 extensive air shower candidates. One such event appears to correspond to an upward-going air shower similar to an event from ANITA-I. A tau neutrino could induce an upward-going air shower, but this interpretation is inconsistent with limits from other experiments and, due to the implied path length through the Earth, potentially in tension with the Standard Model's predicted neutrino-nucleon cross-section.

Speaker: Dr Cosmin Deaconu (UChicago / KICP)

Slides 196-0-CIPANP18_Deaconu.pdf

30 Precision Constraints on Nuclear and Neutrino Reactions via Big Bang Nucleosynthesis

Astronomical observations of high precision $(N_\mathrm{eff}, Y_P, \omega_b, D/H_P, \Sigma m_\nu)$ may soon over determine the cosmological standard model. An effort to constrain physics beyond the standard model with these observations is faced with the challenge of the interrelated problems of neutrino transport (via the quantum kinetic equations) and a stiff nuclear reaction network. We overview work on this topic, highlighting recent advances in our understanding of neutrino flavor evolution in the presence of their collisions with each other and matter in the early universe. We demonstrate, by concurrent solution of the neutrino and matter plasma evolution, percent-level effects on predicted deuterium abundances due to non-equilibrium distortions of the neutrino spectra, an order of magnitude larger than previous estimates. Preliminary results for coherent neutrino flavor evolution in the presence of collisions are also discussed.

Speaker: Dr Mark Paris (Los Alamos National Laboratory)

Slides 197-0-paris_bbn_CIPANP18.pdf

31 Neutrinos from Beta Processes in Presupernovae

We present calculations of the neutrino emissivities and energy spectra from massive stars in the lead up to their explosion as supernovae (presupernovae). Results from the stellar evolution code MESA are used to calculate the neutrino emissivity due to thermal and beta processes. In particular, the beta processes are modeled in detail using a network of 204 isotopes. We show that the contribution of beta processes is substantial, especially in the high energy tail of the spectrum, at E > 3-4 MeV. For a star at D = 1 kpc, we find that a 17 ton liquid scintillator detector would observe several tens of events from a presupernova.

Speaker: Dr Kelly Patton (University of Washington/Institute for Nuclear Theory)

Slides 68-0-pattonCIPANP2018.pdf

32 Multi-Angle Simulations of Matter-Neutrino Resonance

Neutrino flavor transformation in compact object mergers can be dominated by matter-neutrino resonances (MNRs). By efficiently converting electron neutrinos to other species, MNRs can affect nucleosynthesis and the dynamics of the merger. Prior to our work, calulations of MNR have used the single-angle approximation, only following flavor evolution along a single neutrino trajectory. However, self-consistency requires that all trajectories be treated simultaneously. It was not known whether MNR phenomena would be present in a multi-angle model, or whether they were merely an artifact of the single-angle approximation. We present the first fully multi-angle calculations of MNR, finding that some familiar features of single-angle MNR are still present. However, there are qualitative differences compared to the single-angle results. We show that the type of flavor transformation seen in multi-angle MNR is extremely robust, occurring with relatively little change under a wide variety of physical conditions. This suggests that neutrino flavor transformation due to MNR can play an important role in merger environments, and does not strongly depend on detailed assumptions about the matter distribution, neutrino spectrum or composition.

Speaker: Dr Alexey Vlasenko (North Carolina State University)

Slides 159-0-Alexey_Vlasenko_CIPANP2018.pdf

Physics at High Energies: Parallel 1 — Standard Model Tests | Theory

Conveners: Prof. Toyoko Orimoto (Northeastern University), Verena Martinez Outschoorn (UMass Amherst)

33 Studying the Electroweak Sector with the ATLAS Detector

The large integrated luminosities that are available at the LHC, allow to test the gauge structure of the electroweak sector of the Standard Model to highest precision. In this talk, we review the latest results of the ATLAS collaboration involving di-boson and multiboson final states, the electroweak production of vector bosons as well as their constraints of effective field theory operators. Another approach to test the consistency of the electroweak sector is via precision measurements. ATLAS has published a first high precision measurement of the W boson mass, a first measurement of the tau-polarization in Z events as well as a three dimensional cross-section measurement of the Drell-Yan process. The latter allows for the extraction of the forward-backward asymmetry that can be interpreted as a measurement of the weak mixing angle. These results will be presented and discussed.

Speaker: Dr Margherita Spalla (Max Planck Institute for Physics - Munich)

Slides 43-0-SM_EW_ATLAS.pdf

34 Recent Developments in Higgs Physics Precision Calculations

During recent years calculations including fixed order approximations and resummation have decreased theoretical uncertainties on Higgs cross sections tremendously. Most exciting results have been published just this year. I present an overview of recent and most recent developments in Higgs precision physics calculations that allow theory predictions to compete with experimental precision reached by future collider upgrades.

Speaker: Tobias Neumann (Illinois Tech / Fermilab)

Slides 281-0-cipanp18.pdf

35 Neutrino Masses from a Pseudo-Dirac Bino and Its LHC Implications

We know neutrinos have mass, but we don't know how they get their masses. Many models augment the Standard Model with right-handed neutrinos, either Dirac or Majorana, to generate the neutrino masses. I will show that in R-symmetric supersymmetric models, the bino and its Dirac partner the singlino can play the role of right-handed neutrinos. In this mechanism the neutrino masses are generated in a very simple fashion. I will discuss interesting signatures of this model at high energy colliders.

Speaker: Dr Seyda Ipek (UC Irvine)

Slides 274-0-ipek_neutrinos_CIPANP18.pdf

36 Modification of Higgs Pair Production at the LHC

The Higgs pair production in gluon fusion is a sensitive probe of Beyond-Standard Model (BSM) phenomena and its detection is a major goal for the LHC and higher energy hadron collider experiments. We reanalyze the possible modifications of the Higgs pair production cross section within low energy supersymmetry models allowed by the current LHC search bounds, where we analyze the combined effects of a modification of the Higgs trilinear and top-quark Yukawa couplings on the di-Higgs production rate in presence of stops. We also explore the implications of such modification of the cross-section in the context of discovering the deviation in the triple Higgs coupling from the SM value, which is correlated with First order phase transitions of the scalar potential in many models, e.g. NMSSM.

Speaker: Aniket Joglekar (UC Riverside)

Slides 283-1-CIPANP18_Aniket2.pdf

15:40 Break

Dark Matter: Parallel 2 — Axions and Light Mass Dark Matter

Convener: Reina Maruyama (Yale University)

37 Experimental Signatures of Ultra-Light Dark Matter

Observational limits on the mass of dark matter are weak — they allow the mass of dark matter to be anywhere from $10^{-22}$ eV – $10^{48}$ GeV. In this talk, I will focus on ultra-light dark matter in the mass range $10^{-22}$ eV – $10^{-5}$ eV. A number of well motivated dark matter candidates such as axions inhabit this vast parameter space. Even though these candidates emerge from a number of models, there are only four possible experimental signatures of these models: they can drive currents in circuits, lead to spin precession, exert forces on particles, and change the values of fundamental constants. All of these effects can be experimentally probed using precision magnetometry and interferometry.

Speaker: Surjeet Rajendran (UC Berkeley)

Slides 331-0-Ultralight.pdf

38 Recent Results from the Axion Dark Matter Experiment (ADMX)

The nature of dark matter is one of the great mysteries of modern physics today and is likely new particles beyond the Standard Model. The Axion, originally conceived as a solution to the strong-CP problem in nuclear physics, is one well-motivated candidate. The Axion Dark Matter Experiment (ADMX) was started at LLNL in the mid-1990s and ran until 2010 before it was moved to the U. of Washington where it is now a DOE Gen 2 project. ADMX uses a large microwave cavity immersed in a strong static magnetic field to resonantly convert dark matter axions to detectable photons. Recently ADMX has completed its first data run with unprecedented sensitivity in the classical QCD-axion mass range of several $\mu$eV. In this talk I will describe the history of axion dark matter searches, describe the recent ADMX results, and give a survey of the R&D efforts currently underway to explore the entire axion dark matter mass window.

Speaker: Dr Gianpaolo Carosi (Lawrence Livermore Natl Lab)

Slides 273-0-ADMX_CIPANP_May2018_Carosi_final.pdf

39 Status and Future Plans for the HAYSTAC Experiment

HAYSTAC (Haloscope At Yale Sensitive To Axion CDM) is a microwave cavity experiment designed both as a data pathfinder and innovation test-bed, in the 3–12 GHz (12–50 $\mu$eV) mass range. The Phase I run program (2016–17) covered a small region of mass around 24 $\mu$eV, achieving a sensitivity in axion-photon coupling well into the range of realistic axion models for a standard halo density. With a tunable annular copper cavity of only 1.5 L volume in a 9 T superconducting magnet, HAYSTAC achieved a system noise temperature of only 2× the Standard Quantum Limit ($k_{B}T_{SYS} = h\nu$), an order of magnitude improvement over any other experiment; its extraordinary sensitivity owing to the first-ever use of Josephson Parametric Amplifiers (JPA) and a dilution refrigerator in a microwave cavity experiment. Currently, a 2-JPA squeezed-vacuum state receiver is being integrated into the experiment that will enable a significant speed up of data taking; commissioning will begin early summer. Innovations in microwave resonators will also be described, such as Photonic Band Gap structures to eliminate interference from unwanted TE-modes with the TM010-like mode of interest, which couples to the axion field.

Speaker: Prof. Karl van Bibber (University of California Berkeley)

Slides 357-0-CIPANP_2018.pdf

40 DM Radio: An Optimized Resonant Search for Axion and Hidden-Photon Dark Matter

We discuss DM Radio, a lumped-LC resonant search for axion and hidden-photon dark matter between 100 Hz and 300 MHz. We illustrate the detection concept and discuss design and fabrication of the Pilot detector, which will operate in liquid helium at 4 K over the next three years and probe hidden photons in a portion of this frequency range. We show results from a fixed-frequency resonator and present work on detector characterization, including a study of loss mechanisms, shielding performance, and dc SQUID amplifier noise. We discuss future plans to optimize DM Radio, in the context of fundamental limitations on electromagnetic searches for light-field dark matter.

Speaker: Mr Saptarshi Chaudhuri (Stanford University)

Slides 241-0-DMRadio_CIPANP_SChaudhuri_v8.pdf

41 ABRACADABRA: A New Approach to the Search for Axion Dark Matter

The evidence for the existence of dark matter is well supported by many cosmological observations. Separately, long standing problems within the Standard Model point to new weakly interacting particles to help explain away unnatural fine-tunings. The axion was originally proposed to explain the strong CP problem, but was subsequently shown to be a strong candidate for explaining the Dark Matter abundance of the Universe. ABRACADABRA is a proposed experiment to search for ultralight axion Dark Matter, with a focus on the mass range $10^{-14} < m_a <10^{-6}$ eV. We search for these axions and other axion-like particles (ALPs) through a modification to Maxwell's equations, which cause strong magnetic fields to source weak oscillating electrical currents parallel to the field. In this talk, I will describe the working principle behind the ABRACADABRA experiment as well as the prototype that we are running at MIT called ABRACADABRA-10 cm.

Speaker: Jonathan Ouellet

Slides 57-0-ABRA_Intersections_2018_May_29_Ouellet.pdf

42 Probing Sub-GeV Dark Matter with Superfluid Helium

We propose a new dark matter detector that will be sensitive to nuclear recoils of sub-GeV dark matter, using superfluid helium as a target. Superfluid helium has many merits as a detector target: these include good kinematic matching to low mass dark matter, excellent intrinsic radiopurity, and its unique ability to be cooled down as a liquid to milli-Kelvin temperatures. We propose to read out the recoil signals by calorimetry based on transition edge sensor readout. Calorimeters submerged in the liquid will measure prompt scintillation photons with near-100% efficiency, while the long-lived rotons and phonon excitations will be detected by quantum evaporation of helium atoms from the liquid surface, into vacuum, and then onto a calorimeter array. The binding energy from helium absorption to the calorimeter surface allows for the amplification of these quantum evaporation signals, allowing sub-eV recoil energy thresholds. Taking into account the relevant backgrounds and detector discrimination power based on the light:heat ratio, sensitivity projections show that a small detector ($\sim$kg scale) can already explore new parameter space.

Speaker: Daniel McKinsey

Slides 228-0-McKinsey_CIPANP_2018.pdf

43 The Light Dark Matter eXperiment

The Light Dark Matter eXperiment (LDMX) proposes a high-statistics search for low-mass dark matter in fixed-target electron-nucleus collisions. Ultimately, LDMX will explore thermal relic dark matter over most of the viable sub-GeV mass range to a decisive level of sensitivity. To achieve this goal, LDMX employs the missing momentum technique, where electrons scattering in a thin target can produce dark matter via "dark bremsstrahlung" giving rise to significant missing momentum and energy in the detector. To identify these rare signal events, LDMX individually tags incoming beam-energy electrons, unambiguously associates them with low energy, moderate transverse-momentum recoils of the incoming electron, and establishes the absence of any additional forward-recoiling charged particles or neutral hadrons. LDMX will employ low mass tracking to tag incoming beam-energy electrons with high purity and cleanly reconstruct recoils. A high-speed, granular calorimeter with MIP sensitivity is used to reject the high rate of bremsstrahlung background at trigger level while working in tandem with a hadronic calorimeter to veto rare photonuclear reactions. This talk will summarize the small-scale detector concept for LDMX, ongoing performance studies, and near future prospects.

Speaker: Omar Moreno (SLAC National Accelerator Laboratory)

Slides 184-0-2018_cipanp.pdf

HFCKM / PPHI: Parallel 2 — LFU/CLF Violation

Convener: Prof. Aida El-Khadra (University of Illinois at Urbana-Champaign)

44 The MEG Experiment: Run I Final Results and Preparation for Run II

The MEG experiment at the Paul Scherrer Institut searches for charged lepton flavor violation in the rare muon decay $\mu^+ \to e^+ + \gamma$. The first run during the 2009–13 period excludes the decay process at the sensitivity limit of $4.2\times 10^{-13}$ at 90% confidence level. An upgrade of the experiment, MEGII, is underway with the aim to improve the sensitivity by an order of magnitude. We discuss the motivation and the analysis strategy for the search followed by a description of the new detectors, novel components and design of the existing detectors, and new calibration techniques. In preparation for the second run (2018–21), scheduled to start at the end of this year, we review the status of the current upgrades and conclude with the expected sensitivity of the MEGII experiment.

Speaker: Dr Terence Libeiro (UCI)

Slides 198-0-MEG2CIPANP.pdf

45 The Mu2e Experiment

The Mu2e experiment at Fermilab aims to measure the neutrinoless conversion of a negative muon into an electron, a reaction violating charged lepton flavor conservation. This process is extremely suppressed in the Standard Model, and an observation would constitute an unambiguous sign of new physics beyond the Standard Model. The conversion signal is characterized by a monochromatic electron with an energy slightly below the rest mass of the muon (104.97 MeV). We expect to reach a single event sensitivity on the ratio between the muon conversion and capture rate in aluminum of $3\times10^{-17}$ at 90% CL after three years of data taking. We present an overview of the theory and motivation for the Mu2e experiment, our experimental design, and the current status of the experiment. We also provide a brief summary of the proposed Mu2e-II experiment that would provide a factor of 10 improvement in sensitivity over Mu2e.

Speaker: Dr Tomonari Miyashita (Caltech)

Slides 156-0-The_Mu2e_Experiment.pdf

46 PEN Experiment: a Precise Test of Lepton Universality

$V$–$A$ helicity suppression of the $\pi^+\to e^+ \nu (\gamma)$ decay (known as "$\pi_{e2}$") amplifies the sensitivity to pseudoscalar terms by a factor of $\sim$8000, enabling indirect searches for non-SM pseudoscalar terms, as well as scalar and tensor terms, through loop effects, with good sensitivity to interesting regions of the beyond-SM parameter space (e.g., supersymmetric extensions). The ratio $R_{e/\mu}^\pi = [\Gamma(\pi \to e \bar{\nu} (\gamma))] / \left[\Gamma(\pi \to \mu \bar{\nu} (\gamma))\right]$ provides the current best limit on the universality of $W$ coupling to the $e$ and the $\mu$, with broad implications, including in the neutrino sector. Recent LHCb data on $B^0 \to K^\star_0\ell^+\ell^-$ decays, coming on the heels of previous measurements from Belle and BaBar, have focused new interest on possible violation of lepton universality. The PEN collaboration is at the threshold of obtaining new results for $R_{e/\mu}^\pi$ at sub-10$^{-3}$ precision from measurements completed at PSI several years ago. We discuss the status of the PEN data analysis and the expected uncertainty limits, as well as complementarity with results of high-energy studies.

Speaker: Prof. Dinko Pocanic (University of Virginia)

Slides 175-0-foils.pdf

47 Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $\pi \to e \nu$

Data from the PIENU experiment at TRIUMF have been examined for evidence of a heavy neutrino coupled to the positron in the decay $\pi \to e \nu$. Limits on the mixing of neutrinos in the mass range 60–135 MeV/$c^2$ with the electron neutrino, which are up to an order of magnitude improvement over previous results, will be presented. The PIENU experiment was also designed to make a high-precision measurement of the $ \pi \to e \nu $ branching ratio: $ R_\pi = \frac{\Gamma(\pi \to e \nu \ + \ \pi \to e \nu \gamma)}{\Gamma(\pi \to \mu \nu \ + \ \pi \to \mu \nu \gamma)}$, which provides a sensitive test of lepton universality and places tight constraints on many new physics scenarios. The branching ratio analysis is in the final stages, and the status will be presented, as well as a summary of published results based on a subset of the data.

Speaker: Richard Mischke (TRIUMF)

Slides 120-1-PiENu_at_CIPANP18.pdf 120-2-PiENu_at_CIPANP18.pptx

48 RD and RD*: Theoretical Developments

I will present an overview of theoretical developments on RD and RD*, in which discrepancies between experimental data and the Standard Model predictions have been reported, referred to as the B anomaly. Then I will summarize New Physics explanations for the B anomaly.

Speaker: Ryotaro Watanabe (University of Montreal)

Slides 212-0-RW_CIPANP2018.pdf

49 Diagnosing New Physics with Lepton Universality Violation and Lepton Flavor Violation

Recent measurements in $B$ decays may indicate lepton universality violation. I will discuss how such lepton universality new physics might arise and how in many cases this new physics also leads to lepton flavor violation. I will consider some interesting processes where lepton universality and lepton flavor violations may be observed.

Speaker: Prof. Alakabha datta (University of Mississippi)

Slides 318-0-Datta_CIPANP.pdf

Neutrino Masses and Neutrino Mixing: Parallel 2 — Neutrinoless Double Beta Decay

Convener: Daniel Dwyer

50 First $0\nu\beta\beta$ Decay Search Results from CUORE and Status of CUPID R&D

The Cryogenic Underground Observatory for Rare Events (CUORE) is a large neutrinoless double beta ($0\nu\beta\beta$) decay search experiment currently taking data at the Laboratori Nazionali del Gran Sasso (LNGS). Such searches can address fundamental questions that remain about the nature of the neutrino such as the mass hierarchy, whether they are Majorana fermions, and may present new physics beyond the Standard Model via lepton number violation. CUORE is the most massive array of crystal bolometers in the world containing a total of 988 TeO$_2$ crystals (742 kg) with an expected sensitivity to the $^{130}$Te $0\nu\beta\beta$ half-life of $9\times10^{25}$ years (90% C.L.) after 5 years of operation. This talk will discuss the recently published CUORE limit on the $^{130}$Te $0\nu\beta\beta$ half-life, $T>1.3\times10^{25}$ years (90% C.L.), as well as the current status of CUORE. Additionally an overview of the current state of R&D towards the proposed next generation experiment, CUORE Upgrade with Particle ID (CUPID), will be presented.

Speaker: Bradford Welliver (LBNL)

Slides 140-0-CIPANP2018_CUORE_bwelliver.pdf

51 Status and Initial Results of the Majorana Demonstrator

Located at the 4850' level of the Sanford Underground Research Facility (SURF), the Majorana Demonstrator (MJD) experiment is searching for neutrinoless double beta ($0\nu\beta\beta$) decay in $^{76}$Ge with high-purity Germanium (HPGe) detectors. The initial goals of the Demonstrator are to establish the required background and scalability of a ton-scale Ge-based experiment. The construction and commissioning of the Demonstrator has been completed and the multiple-year data-taking has started. Initial results from the first physics run has demonstrated an unprecedented energy resolution of 2.5 keV FWHM at $Q_{\beta\beta}$ and an ultra-low background that is consistent with the background goals. The initial 10 kg$\cdot$yr of enriched Ge exposure resulted in a lower limit on the $0\nu\beta\beta$ decay half-life of $1.9\times10^{25}$ yr (90% CL). In this talk, we will discuss the status of the Majorana Demonstrator, the recent physics results, and the implications and status of the LEGEND ton-scale Ge-based neutrinoless double-beta decay program.

Speaker: Dr Wenqin Xu (University of South Dakota)

Slides 62-0-CIPANP_Wenqin_Xu_may_29_18.pdf

52 LEGEND: The Large Enriched Germanium Experiment for Neutrinoless Double-Beta Decay

The lepton number violating process of neutrinoless double-beta decay could result from the physics beyond the Standard Model needed to generate the neutrino masses. Taking different approaches, the current generation of $^{76}$Ge experiments, the MAJORANA DEMONSTRATOR and GERDA, lead the field in both the ultra-low background and energy resolution achieved. The next generation of neutrinoless double-beta decay experiments requires increased mass and further reduction of backgrounds to maximize discovery potential. Building on the successes of the MAJORANA DEMONSTRATOR and GERDA, the LEGEND collaboration has been formed to pursue a tonne-scale $^{76}$Ge experiment, with discovery potential at a half-life beyond $10^{28}$ years. The collaboration aims to develop a phased neutrinoless double-beta decay experimental program, starting with a 200 kg measurement using the existing GERDA cryostat at LNGS. I will discuss the plans and physics reach of LEGEND, and the combination of R&D efforts and existing resources being employed to expedite physics results.

Speaker: Dr Jordan Myslik (Lawrence Berkeley National Laboratory)

Slides 210-0-20180529_CIPANP_LEGEND_Myslik.pdf

53 Deep Neural Networks for Energy and Position Reconstruction in EXO-200

The EXO-200 experiment is dedicated to the search of neutrinoless double beta ($0\nu\beta\beta$) decay in liquid xenon enriched in the isotope 136. A single-phase time projection chamber (TPC), containing 110 kg of active mass, is realized in an ultra-low background environment where both ionization charge and scintillation light is detected. Both channels are combined for improved energy resolution and better background rejection. Conventional multivariate analyses have been performed on the first two years of data with one of the most sensitive results on $0\nu\beta\beta$ decay and data taking in Phase-II is ongoing. Novel approaches of data analysis on the basis of deep learning were implemented and promising first results were achieved towards better reconstruction of events in EXO-200.

Speaker: Dr Manuel Weber (Stanford University)

Slides 311-0-CIPANP2018_-_Weber.pdf

54 Status and Future for the NEXT Collaboration in Neutrinoless Double Beta Decay

Neutrinoless double beta decay ($0\nu\beta\beta$) searches are key components of the physics program dedicated to understanding the nature and mass of the neutrino. The Neutrino Experiment with a high-pressure Xenon Time Projection Chamber (NEXT) collaboration uses high pressure gas xenon time projection chambers (TPCs) to demonstrate the performance and scalability of this technology as isotope masses increase with each experimental generation. I will first highlight some recent results from NEXT-White, a 5 kg-scale detector currently operating at the Laboratorio Subterraneo de Canfranc (Spain). I will then describe research and development related to NEXT-100, a 100 kg-scale detector which is the next generation of NEXT experiments and expected to take data starting in 2019.

Speaker: Dr Sereres Johnston (Argonne National Laboratory)

Slides 150-0-cipanp2018Johnston.pdf

55 Search for Neutrinoless Double-Beta Decay with SNO+

The SNO+ experiment, located in SNOLAB, 2 kilometers underground in the Creighton mine, near Sudbury, Canada, is a large scale neutrino detector whose main purpose is to search for neutrinoless double-beta decay and thus probe the Majorana nature of the neutrino. With 780 tons of liquid scintillator loaded with tellurium, SNO+ aims at exploring the Majorana neutrino mass parameter space down to the inverted mass hierarchy region. The versatility of the SNO+ detector also allows it to detect solar and reactor neutrinos, provide a measurement of the geoneutrino flux, detect galactic core-collapse supernovae and perform nucleon decay searches. The SNO+ experiment is currently taking data with a detector fully filled with ultrapure water. The detector will be completely filled with liquid scintillator in the coming months and subsequently loaded with tellurium. This presentation will describe the physics case, detector design and current status of SNO+.

Speaker: Dr Vincent Fischer (UC Davis)

Slides 270-0-SNOplus_CIPANP2018_FISCHER.pdf

Physics at High Energies: Parallel 2 — Higgs Physics

Conveners: Prof. Toyoko Orimoto (Northeastern University), Verena Martinez Outschoorn (UMass Amherst)

56 Measurements and Searches of Higgs Boson Decays to Two Fermions

Measurements and searches of Higgs boson decays to two third- or two second-generation quarks or leptons are presented using 36 fb$^{-1}$ of $pp$ collision data collected at 13 TeV.

Speaker: Mr Tatsuya MASUBUCHI (The University of Tokyo, International Center for Elementary Particle Physics)

Slides 45-0-CIPANP2018_v3.pdf

57 Evidence for Higgs Boson Production in Association with a $t\bar{t}$ Pair

The search for the production of the Higgs Boson with a pair of $t\bar{t}$ quarks is both very important and very challenging. This talk presents the analyses using Higgs boson decays to $b\bar{b}$ pairs, to two $Z$ bosons, to other multi-lepton final states, and to a pair of photons, using 36 fb$^{-1}$ of $pp$ collision data collected at 13 TeV, as well as their combined results.

Speaker: Mr Jannik Geisen (II. Physikalisches Institut, Georg-August-Universitaet Goettingen)

Slides 46-0-ATL-COM-PHYS-2018-522.pdf

58 Measurement of Cross Sections and Properties of the Higgs Boson in Decays to Bosons Using the ATLAS Detector

Measurements of Higgs boson properties and cross sections measured in Higgs boson decays to two photons, two $Z$ bosons, and two $W$ bosons based on $pp$ collision data collected at 13 TeV are presented. In addition, results from the combination of different decay channels are shown.

Speaker: Lucrezia Stella Bruni (NIKHEF)

Slides 44-0-CIPANP18-Bruni.pdf

59 Searches for Rare and Non-Standard Model Decays of the Higgs Boson

Theories beyond the Standard Model predict Higgs boson decays at a much enhanced rate compared to the Standard Model, e.g. for decays to $Z$+photon, or a meson and a photon, or decays that do not exist in the Standard Model, such as decays into two light bosons (a). This talk presents recent results based on 36 fb$^{-1}$ of $pp$ collision data collected at 13 TeV.

Speaker: Mr Elliot Reynolds (University of Birmingham)

Slides 47-0-RareOrBSMHiggsDecays_CIPANP2018_ElliotReynolds.pdf

60 Precision Measurements with Di-Bosons at the LHC

Precision measurements at the LHC can provide probes of new physics, and they are complementary to direct searches. The high energy distribution of di-boson processes ($WW,WZ,Vh$) is a promising place, with the possibility of significant improvement in sensitivity as the data accumulates. We focus on the semi-leptonic final states, and make projections of the reach for future runs of the LHC with integrated luminosities of 300 fb$^{−1}$ and 3 ab$^{−1}$. We emphasize the importance of tagging the polarization of the vector bosons, in particular for the $WW$ and $WZ$ channels. We employ a combination of kinematical distributions of both the $W$ and $Z$, and their decay products to select the longitudinally polarized $W$ and $Z$. We have also included our projections for the reach using the associated production of vector bosons and the Higgs. We demonstrate that di-boson measurements in the semi-leptonic channel can surpass the sensitivity of the precision measurement at LEP, and they can be significantly more sensitive than the HL-LHC $h\to Z\gamma$ measurements. We have also considered the reaches on the new physics mass scale in different new physics scenarios, including the Strongly Interacting-Light Higgs (SILH), the Strongly Coupled Multi-pole Interaction (Remedios), and the class of models with partially composite fermions.

Speaker: Dr Da Liu (Argonne National Laboratory)

Slides 259-0-Talk_Da.pdf

61 Heavy Higgs Search in the Models with Vectorlike Fermions

I will discuss models with extended Higgs doublets and extra heavy fermions. In this scenario, a promising way of searching both the neutral heavy Higgs and vectorlike fermion signals at the LHC is observing the heavy Higgs cascade decay into a vectorlike fermion which subsequently decays into $W$, $Z$ gauge bosons or the SM Higgs boson. In this talk, I will also show the signal sensitivities in the future LHC program, HL/HE-LHC.

Speaker: Dr Seodong Shin (University of Chicago / Yonsei University)

Slides 291-0-CIPANP2018.pdf

QCD, Hadron Spectroscopy, and Exotics: Parallel 2 — Heavy Spectroscopy

Convener: Dr Seamus Riordan (Argonne National Laboratory)

62 Model Independent Constraints on $R(J/\psi)$

LHCb has recently presented a measurement of $R(J/\psi)=\mathcal{BR}(B_c^+\rightarrow J/\Psi \tau^+\bar\nu_\tau)/\mathcal{BR}(B_c^+\rightarrow J/\Psi \mu^+\bar\nu_\mu)$. The value, $R(J/\psi)=0.71\pm 0.17\pm 0.18$ is in mild tension with the range of model predictions 0.25-0.28. The model transition form factors dominate the systematic uncertainty of the measurement and limit the predictions to a range of values. To improve this situation, we have undertaken to compute model-independent constraints on the transitions form factors via dispersive methods. This allow for rigorous error estimates to be assigned and $R(J/\psi)$ to be computed.

Speaker: Dr Henry Lamm (University of Maryland)

Slides 14-0-Lamm_Presentation.pdf

63 Implication of Chiral Symmetry on the Heavy-Light Spectroscopy

For a long time, the quark model has served as an ordering scheme and brought systematics into the hadron zoo. However, many new hadrons that were observed since 2003, including the lowest-lying positive-parity charm-strange mesons $D_{s0}^\star$(2317) and $D_{s1}$(2460), do not conform with quark model expectations. Various modifications to the quark model and alternative approaches have been proposed ever since to explain their low masses and decay properties. We demonstrate that if the lightest scalar (axial vector) states are assumed to owe their existence to non-perturbative $\pi/\eta/K-D^{(\star)}/D_s^{(\star)}$ scattering, various puzzles in the $D$-meson spectrum get resolved. Most importantly the ordering of the lightest strange and non-strange scalars becomes natural. We show the well constrained amplitudes for Goldstone-Boson$-D/D^\star$ scattering are fully consistent with recent high quality data on $B^-\to\pi^-\pi^-D^+$ final states. This implies that the lowest quark-model positive-parity charm mesons, together with their bottom cousins, if realized in nature, do not form the ground-state multiplet. This is similar to the pattern that has been established for the scalar mesons made from light up, down and strange quarks, where the lowest multiplet is considered to be made of states not described by the quark model. In a broader view, the hadron spectrum must be viewed as more than a collection of quark model states.

Speaker: Dr Meng-Lin DU (Helmholtz-Institut f\"ur Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universit\"at Bonn)

Slides 141-0-CIPANP2018_Du.pdf

64 Precise Measurement of the $D^\star(2010)^+ - D^+$ Mass Difference

We measure the mass difference, $\Delta m_+$, between the $D^\star (2010)^+$ and the $D^+$, using the decay chain $D^\star (2010)^+\to D^+ \pi^0$ with $D^+\to K^- \pi^+ \pi^+$. The data were recorded with the BaBar detector at center-of-mass energies at and near the $\Upsilon$(4S) resonance, and correspond to an integrated luminosity of approximately 468 fb$^{-1}$. We measure $\Delta m_+ = (140,601.0 \pm 6.8 \,[\mathrm{stat}] \pm 12.9 \, [\mathrm{syst}])$ keV. We combine this result with a previous BaBar measurement of $\Delta m_0\equiv m(D^\star(2010)^+) - m (D^0)$ to obtain $\Delta m_D = m(D^+) - m(D^0) = (4,824.9 \pm 6.8\,[\mathrm{stat}] \pm 12.9\,[\mathrm{syst}])$ keV. These results are compatible with, and approximately five times more precise than, previous world averages.

Speaker: Prof. Abner Soffer (Tel Aviv University)

Slides 170-0-Soffer-CIPANP18-parallel.pdf

65 Dibaryon Searches in Decuplet Baryons from Lattice QCD

In recent years, there is a renewed interest in the dibaryons due to exclusive measurements in hadron reactions as well as the direct measurement in relativistic heavy-ion collisions. In this talk, we will present the result of the dibaryon searches from lattice QCD. Particularly we focus on the study of "Most strange dibaryon", which is composed of two $\Omega$ baryons. First, we will show the result of the $\Omega$-$\Omega$ interaction in the $^1S_0$ channel at almost physical point, and then will clarify that the interaction leads to a shallow bound state. We may talk about the $\Delta$-$\Delta$ interaction in the $^7S_3$ channel in the case of the heavy pion mass. In the interaction, there appears a deep bound state that is observed as a resonance of two nucleons in an experiment by the CELSIUS/WASA Collaboration. S. Gongyo $\textit{et al.}$, Most Strange Dibaryon from Lattice QCD, arXiv:1709.00654 [hep-lat], accepted in PRL.

Speaker: Dr Shinya Gongyo (RIKEN Nishina Center, RIKEN)

Slides 130-0-CIPAMP_gongyo_.final.pdf

66 Single-Top Production in the Standard Model and Beyond

I present high-order calculations for single-top production in the Standard Model and in models with anomalous top-quark couplings. Theoretical results are presented for total cross sections and top-quark transverse momentum and rapidity distributions for the $t$ and $s$ single-top channels as well as for the associated production of a top quark with a $W$-boson in the Standard Model. Corrections from soft-gluon emission though NNNLO are included. I also show results for the associated production of a top quark with a $Z$ boson in processes involving anomalous top-quark couplings.

Speaker: Prof. Nikolaos Kidonakis (Kennesaw State University)

Slides 10-0-Kidonakis-top.pdf

67 Measurement of Polarization Observables in the Reaction $\gamma p \to K^+ \Lambda$

Spin observables are important to understand the production mechanisms of hyperons, as well as the contribution of intermediate baryon resonances. $\Lambda$ polarization observables have been studied extensively in the recent decades using the reaction $\gamma + p \to K^+ + \Lambda$. This talk presents the measurement of transferred polarization coefficients $C_x$ and $C_z$, and the induced polarization $P$, using a new set of high statistics data, obtained using the CEBAF Large Acceptance Spectrometer (CLAS) detector at Jefferson Lab. The photon beam energy range is 1.117 to 5.45 GeV. These results ($C_x, C_z$ and $P$) are extracted simultaneously using the Maximum Likelihood Method. The measurements for $C_x$ and $C_z$ have nearly an order of magnitude increase in events compared to previously published results and also extend the kinematic range for $W > 2.54$ GeV, important for both the search for high-mass nucleon states as well as to provide information about non-resonant contributions.

Speaker: Shankar Adhikari (Florida International University)

Slides 179-0-CIPANP_Shankar.pdf

Tests of Symmetries and the Electroweak Interaction: Parallel 2 — Nucleon and Nuclear Electric Dipole Moments

Convener: Dr Vincenzo Cirigliano (Los Alamos National Laboratory)

68 EDMs: Theory Overview

Electric dipole moments (EDMs) are extremely sensitive probes of physics beyond the Standard Model (SM). A vibrant experimental program is in place, with the goal of improving existing bounds on the electron and neutron EDMs by one/two orders of magnitude, while testing new ideas for the measurement of EDMs of light ions, such as the proton and the deuteron, at a comparable level. The success of this program, and its implications for physics beyond the SM, relies on the precise calculation of the EDMs in terms of the couplings of CP-violating operators, induced by BSM physics in the QCD Lagrangian. In light of the non-perturbative nature of both QCD at low energy and of the nuclear interactions, these calculations have proven difficult, and are affected by large theoretical uncertainties. In this talk I will review the progress that has been achieved on different aspects of the calculation of hadronic and nuclear EDMs, the challenges that remain to be faced, and the implications for our understanding of physics beyond the SM.

Speaker: Emanuele Mereghetti (LANL)

Slides 252-0-CIPANP.pdf

69 Worldwide Search for a Neutron EDM

Existing limits on the electric dipole moment (EDM) of the free neutron have provided critical constraints on new sources of CP violation for more than 60 years. A new round of searches are actively underway with the goal of improving the sensitivity to CP violation by up to two orders of magnitude. The status of these new searches will be discussed, including recent progress on the nEDM experiment to be carried out at the Fundamental Neutron Physics Beamline at the Oak Ridge National Laboratory's Spallation Neutron Source.

Speaker: brad filippone (caltech)

Slides 191-0-CIPANP_2018.pptx 191-1-CIPANP_2018.pdf

70 Towards TUCAN’s Search for the Neutron Electric Dipole Moment

TUCAN (TRIUMF ultracold advanced neutron source) is a transpacific collaboration with the objective to measure the neutron electric dipole moment (nEDM) with unprecedented precision. We aim at a precision of $10^{-27}$ e.cm, an improvement by a factor of 30 over the current upper limit for this elusive quantity. A non-zero nEDM violates parity and time-reversal symmetry, and is thus intimately linked to the baryon asymmetry of the universe. The tool of choice to search for an nEDM are ultracold neutrons (UCN) that move at velocities of only a few meters per second and can be stored and observed for up to hundreds of seconds. TUCAN recently completed a major milestone: production of the first UCN in Canada by operating a prototype source, developed at RCNP Osaka, Japan, at a dedicated proton beam line at TRIUMF, Vancouver, Canada. This source is based on a neutron spallation source combined with a superfluid helium cryostat – a unique approach among the handful of worldwide efforts to produce significant densities of UCN for nEDM searches and other high precision experiments. This presentation will describe TUCAN’s current efforts and timeline towards design, implementation, and commissioning of the required next-generation UCN source and nEDM spectrometer.

Speaker: Dr Wolfgang Schreyer (TRIUMF)

Slides 205-0-CIPANP2018.pdf

71 Status of the Storage Ring Proton EDM Experiment

Charged particle EDM experiments can be done with high sensitivity using storage rings. Radial electric fields bend a longitudinally polarized beam for storage while at the same time couple with the particle EDM. Having the so-called magic momentum, the spin precession in the horizontal plane can be frozen. Still, the spin can make a precession in the vertical plane with a rate proportional to the magnitude of the EDM ($d_p$). We have a preliminary ring design to make the proton EDM experiment with a sensitivity of $d_p=10^{-29}\ e\cdot$cm. The EDM signal corresponds to a few nrad/s of spin precession rate in the vertical plane. There are several spin and electromagnetic field configurations that can lead to a false EDM signal of the same order, like a net radial magnetic field and/or vertical electric field depending on the details of the ring lattice. This talk summarizes the ring design with a focus on the systematic errors.

Speaker: Selcuk Haciomeroglu (Institute for Basic Science, Korea)

Slides 258-0-selcuk_h_pEDM.pdf

72 The Radium-225 Experiment

Due to its large nuclear octupole deformation and high atomic mass, the radioactive isotope $^{225}$Ra is a favorable case to search for an electric dipole moment (EDM); it is particularly sensitive to CP-violating interactions in the nucleus. However, its scarcity and low vapor pressure present significant challenges. To measure this rare isotope, we have developed an approach to measuring atomic EDMs by using lasers to cool radium atoms to 40 micro-Kelvin, and then we trap those atoms in an optical dipole trap. The atoms are then allowed to precess in magnetic and strong electric fields. Using this method, we have found the EDM of radium to be less than $1.4\times 10^{-23}$ e-cm (95% C.L.). Upcoming improvements are expected to dramatically improve our sensitivity, and significantly improve on the search for new physics in several sectors.

Speaker: Dr Matthew Dietrich (Argonne National Laboratory)

Slides 192-0-2018_CIPANP_Dietrich.pdf

73 Progress on the Nucleon EDM in Lattice QCD

EDM of the nucleon, whether observed or further constrained, can be traced back to various CP-violating quark and gluon effective interactions. In order to constrain these effective interactions and, subsequently, the extensions of the Standard Model, nonperturbative calculations of nucleon structure are necessary. Low-energy theories and nucleon models provide ballpark estimates for the nEDM sensitivity to CP violation at the quark/gluon level, while precise and model-independent relations between nEDM and various sources of CP violation are expected from QCD calculations on a lattice. Lattice QCD has reached a respectable level of statistical and systematic precision for hadron spectrum and simple nucleon structure observables with physical quark masses, and on the verge of producing reliable results for nucleon EDM induced by lowest-order quark-gluon operators. In this talk, I will briefly overview the current status of these calculations as well as show some recent preliminary results.

Speaker: Prof. Sergey Syritsyn (Stony Brook University)

Slides 107-0-syritsyn-2018-cipanp-edm.pdf

74 Search for Time Reversal Invariance Violation in Resonances of Compound Nuclei Accessible Using Epithermal Neutrons

One of the main puzzles in contemporary physics is the asymmetry between matter and antimatter observed in the Universe. In our current understanding, one of the necessary ingredients to explain such asymmetry is the violation of CP (or equivalently the TRIV), however it has only been observed in the weak interaction and with a very small amplitude. Searches of new mechanisms of CP violation in the strong interaction are of scientific importance. In this context, the transmission of polarized epithermalneutrons in resonances of compound nuclei that exhibit large parity-violating effects offers a possibility to search for T-odd effects that constitute a null test for TRIV and that are complementary to other searches, like the neutron EDM.

Speaker: Dr Libertad Barrón-Palos (Universidad Nacional Autónoma de México)

Slides 139-0-CIPANP2018.pdf

18:30 RECEPTION

Wednesday, 30 May

Registration Desk: Open 07:30 – 17:30

Plenary 3: Heavy Flavors and the CKM Matrix | Special Topic

Convener: Prof. Young-Kee Kim (The University of Chicago)

75 Lepton Universality Violation

There is a wealth of experimental results questioning the deep-rooted assumption of lepton universality in flavour-changing interactions. Recently, several anomalies were reported by the LHCb collaboration and there is the long standing discrepancy of the anomalous magnetic moment of the muon. At the same time the large LHC experiments do not see clear signals of New Physics, and there are ever-more impressive limits on charged lepton flavour violation. A comprehensive overview of the anomalous results will be presented and their implications will be highlighted.

Speaker: Dr Gerco Onderwater (University of Groningen)

Slides 235-0-CIPANP2018_Onderwater_LNU.pdf

76 Experimental Status of $V_{ub}/V_{cb}$ and the CKM Angle $\gamma$

Precision measurements of CKM parameters are important for defining the Standard Model and for searching for inconsistencies from new-physics contributions. I will review the status of current measurements and discuss the precision expected in future runs of LHCb and Belle II.

Speaker: Prof. Abner Soffer (Tel Aviv University)

Slides 77-0-Soffer-CIPANP18-plenary.pdf

77 Measurement of the Weak Charge of the Proton by the Qweak Collaboration

The measurement of the violation of parity symmetry in electron scattering is a powerful technique in the search for new fundamental forces. The Qweak collaboration has recently completed a highly precise measurement of parity violation in the elastic scattering of longitudinally polarized electrons from unpolarized protons. From this result, the weak charge of the proton is determined and compared to the Standard Model prediction, providing a constraint on the possible influence of new physics. The result will be presented, and the techniques and implications of this measurement will be discussed. Prospects for future improvements will also be briefly reviewed.

Speaker: Mr Kent Paschke (University of Virginia)

Slides 171-1-Paschke_Qweak_CIPANP_noAnimate.pdf

09:45 Break

Plenary 4: Precision Physics at High Intensities | Tests of Symmetries and the Electroweak Interaction

Convener: Dave Bowman

78 Electromagnetic Properties of Antihydrogen and the Antiproton: Recent Results from ALPHA and BASE

The apparent dominance of matter over antimatter in the universe remains one of the greatest puzzles in science. The antiproton decelerator facility at CERN is home to several experiments dedicated to performing precise measurements of the properties of antimatter and hoping to provide insight into the matter-antimatter asymmetry problem. Recently the ALPHA and BASE experiments have reported measurements of the electromagnetic properties of the antihydrogen atom, and antiproton respectively, at unprecedented levels of precision. Following the observation of the first optical transition in antihydrogen atoms in 2016, ALPHA recently characterised one of the hyperfine components of the 1S-2S transition in antihydrogen. It was determined that the resonance frequency of this transition in antihydrogen matches that of hydrogen, and is therefore consistent with CPT invariance, at a relative precision of $2\times10^{-12}$. In 2017 the BASE collaboration reported a measurement of the magnetic moment of the antiproton to a relative precision of $1.5\times10^{-9}$, an improvement on the precision of their previous measurement by a factor of 350. The result rivals the precision of the proton magnetic moment measurement and provides a stringent test of CPT invariance. In this talk I will review the recent measurement of the antiproton magnetic moment by the BASE collaboration, and spectroscopic measurements of the antihydrogen atom by the ALPHA collaboration.

Speaker: Dr Daniel Maxwell (Swansea University)

Slides 90-0-CIPANP2018_DMaxwell.pdf

79 Symmetries and Interactions from Lattice QCD

QCD has been long accepted as the underlying theory behind nuclear forces. However, calculations of nuclear properties directly from QCD have only very recently become mature. The theory's non-perturbative nature at low energies requires the use of lattice regularization (lattice QCD) combined with numerical methods for its solution. With these tools in hand, we are now starting to be able to predict properties of nucleons and their interactions with fully controlled and quantifiable systematics. In addition to giving us unique theoretical insight into the structure of nuclei, these techniques will allow us, for example, to inform the design and construction of experiments which utilize specific nuclei for their symmetry properties, as well as pin down potential signs of new physics from experimental signals. In this talk I will present recent results from the CalLat collaboration relevant for nuclear physics, including a calculation of the nucleon axial charge to 1% precision, as well as quantities relevant for neutrinoless double beta decay searches.

Speaker: Prof. Amy Nicholson (UNC Chapel Hill)

Slides 95-0-ANicholsonCIPANP18.pdf

80 NPDGamma: The Final Chapter

Neutrons have been a useful probe in many fields of science as well as an important physical system for study in themselves. Modern neutron sources provide extraordinary opportunities to study a wide variety of physics topics. Among them is a detailed study of the weak interaction. These measurements, done in few-nucleon systems, are finally letting us gain knowledge of the hadronic weak interaction without the contributions from nuclear effects. The NPDGamma experiment aims to isolate the long-range component of the hadronic weak interaction by measuring the directional parity-violating asymmetry in polarized cold neutron capture on protons. The experiment and analysis will be described and final results will be presented.

Speaker: Prof. Nadia Fomin (University of Tennessee)

Slides 73-0-cipanp_fomin_2018_post.pdf

81 Standard Model Tests in Neutron and Nuclear Beta Decay

The status of tests of the Standard Model and of searches for new physics in nuclear and neutron beta decay will be reviewed. Using a model-independent description, I will discuss the interplay between the different experiments and which ones are the most sensitive and promising. Finally I will analyse the synergy with searches at high-energy colliders, such as the LHC, and with other electroweak precision observables.

Speaker: Martin Gonzalez-Alonso (CERN)

Slides 81-0-Gonzalez-Alonso_CIPANP2018.pdf

12:30 Lunch

Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity: Parallel 3 — The Early Universe

Conveners: Kev Abazajian (UC Irvine), Prof. Neelima Sehgal (Stony Brook University)

82 Inflation Ends, What is Next?

What happens in the aftermath of inflation? In this talk I will focus on the non-perturbative dynamics of fields (such as soliton formation) after inflation ends and its observational consequences including: (1) a change in the expansion history after inflation; (2) generation of high frequency gravitational waves; (3) possibility of primordial black-hole formation. Time permitting, I will also point out a novel connection between the fine-tuning of the Higgs potential and the generation of gravitational waves from the nonlinear dynamics of the Higgs+inflaton system during the post-inflationary epoch.

Speaker: Dr Mustafa Amin (Rice University)

Slides 245-0-Amin_CIPANP.pdf

83 Using Microhalos to Probe the Universe's First Second

As remnants of the earliest stages of structure formation, the smallest dark matter halos provide a unique probe of the primordial density fluctuations generated during inflation and the evolution of the early Universe. Any enhancement to the small-scale matter power spectrum will trigger the formation of dark matter halos far earlier than otherwise expected. Consequently, observational limits on the abundance of early-forming ultra-compact minihalos (UCMHs) place a powerful upper bound on the amplitude of the small-scale power spectrum, which in turn constrains inflationary models. Numerical simulations of UCMH formation reveal that these constraints need to be revised: UCMHs do not have the steep power-law density profiles predicted by spherical collapse. The abundance of microhalos also encodes information about the evolution of the Universe prior to Big Bang nucleosynthesis because deviations from radiation domination accelerate the growth of small-scale density perturbations. The resulting population of microhalos significantly boosts the dark matter annihilation rate, making it possible to use gamma-ray observations to learn about the evolution of the Universe during its first second.

Speaker: Prof. Adrienne Erickcek (University of North Carolina at Chapel Hill)

Slides 154-0-Erickcek_CIPANP.pdf

84 Cosmology with a Helical Flavor

Whether the parity of the Universe is broken on the large scale is an ongoing question. If this is the case, then one may trace the origin of parity violation back to the inflationary era. In this talk, I will review a few mechanisms that lead to the generation of helical fields, a source of breaking the parity on the large scale. The presence of helical U(1) fields in the early Universe can explain the baryon asymmetry of the Universe. In fact, there is a connection between the baryon number and topology of the relic magnetic part of the U(1) field. Both the magnitude and sign of magnetic helicity can be detected in future diffuse gamma ray data. This will be a smoking gun for a link between inflation, parity violating fields, and the baryon asymmetry of the Universe.

Speaker: Dr Mohamed Anber (Lewis & Clark College)

Slides 26-0-helical_cosmology2.pdf

85 Cosmological Probes of Dark Matter Interactions

Abundance of cosmological data will enable sensitive probes of dark matter physics in the coming decade. I will focus on scattering of sub-GeV dark matter with baryons in the pre-recombination Universe, summarize the status of cosmological searches, present forecasts for the next-stage CMB experiments, and discuss distinguishability of various signatures of new physics sought by CMB surveys.

Speaker: Dr Vera Gluscevic (Institute for Advanced Study)

Slides 344-0-Gluscevic_CosmologyDM_CIPANP2018.pdf

86 Self-Interacting Dark Matter and Diverse Galactic Rotation Curves

Astrophysical observations, spanning dwarf galaxies to galaxy clusters, indicate that the dark matter halo properties are much more diverse than predicted in the prevailing cold dark matter theory. In this talk, I will show that self-interacting dark matter can provide a unified solution to a number of observed puzzles on galactic scales, including the diverse galactic rotation curves, the radial acceleration relation, and the density cores in galaxy clusters.

Speaker: Hai-Bo Yu (University of California, Riverside)

Slides 306-0-2018CIPANP_HBYU.pdf

DM / PHE: Parallel 3 — Accelerator Searches for Dark Matter

Convener: Prof. Toyoko Orimoto (Northeastern University)

87 Dark Matter Searches with the ATLAS Detector

Dark matter could be produced at the LHC if it interacts weakly with the Standard Model. The search for dark matter can be performed directly, by looking for a signature of large missing transverse momentum coming from the dark matter candidates escaping the detector, measured against an accompanying visible object (jet, photon, boson). A broad and systematic search program covering these various possibilities with the ATLAS detector is in place: the talk will review the latest results of these searches.

Speaker: Prof. Young-Kee Kim (Chicago University)

Slides 38-0-CIPANP2018-DarkMatter-YKK.pptx

88 Mono-X Searches for Dark Matter with the CMS Detector

Searches using large missing momentum are a powerful tool for probing dark matter hypotheses using the Compact Muon Solenoid at the LHC. Collectively, they are dubbed "mono-X" searches, where X refers to one of many Standard Model signatures. In this talk, I will give an overview of the broad range of CMS mono-X analyses, describe new techniques developed during Run 2, and showcase the latest constraints on DM models.

Speaker: Mr Siddharth Narayanan (MIT)

Slides 353-0-narayanan_180530_v3.pdf

89 Searches for Dark Matter Mediators with the ATLAS Detector

The search for dark matter can be performed indirectly at the LHC by looking for the intermediate mediators which would couple the dark matter particles to the Standard Model. The mediator could indeed decay to jets or leptons, leading to a resonant signature which can be probed. The talk will present the results of these searches with the ATLAS detector and show their complementarity with the other ATLAS searches looking directly for Dark Matter.

Speaker: Mr Peter McNamara (The University of Melbourne)

Slides 39-0-DM_mediators.pdf

90 Searches for Dark Matter Mediators with the CMS Detector

We present several complementary searches for dark matter mediators using a 35.9 inverse femtobarn data set of proton-proton collisions at 13 TeV collected with the CMS experiment at the LHC in 2016. One technique uses the CMS scouting data stream concept to record larger data rates than otherwise possible. Other searches use initial state radiation to overcome trigger thresholds and study boosted dijet resonances, whose decay products are merged into a single jet. Novel jet substructure techniques are used to avoid sculpting the distribution of the jet mass distribution and the dominant background is estimated from data. The searches are interpreted in the context of simplified models of dark matter with a leptophobic mediator. This approach has also been extended to the search for boosted Higgs bosons decaying to bottom quark-antiquark pairs.

Speaker: Javier Duarte (Fermilab)

Slides 354-0-CIPANP_DarkMatterMediators_30May2018.pdf

Heavy Flavors and the CKM Matrix: Parallel 3 — Belle / Belle II and the CKM Matrix

Convener: Wolfgang Altmannshofer (University of Cincinnati)

91 Introduction to the CKM Matrix

The Standard Model CKM matrix describes the observed flavor and CP violating phenomena in particle physics remarkably well. I will review the results of the global Unitarity Triangle fits performed by the UTfit and CKMfitter collaborations that use the latest inputs from experiments, lattice QCD, and phenomenological calculations. Furthermore, I will discuss how the Unitarity Triangle analysis can be extended in the presence of new physics and I will present bounds on the new physics scale that can be derived from meson oscillations.

Speaker: Wolfgang Altmannshofer (University of Cincinnati)

Slides 350-0-CIPANP_altmannshofer.pdf

92 Combined Measurement of the CP Violating Angle $\beta$ by the BaBar and Belle Experiments

We present a recent joint measurement of the CP violating angle $\beta$ using 1.1 inverse attobarns of data collected by the BaBar and Belle experiments. This analysis is based on a time-dependent Dalitz plot analysis of $B\to D^\star h^0$ with $D\to K^0_S\pi^+\pi^−$ decays. These decays provide experimental access to cos(2$\beta$) as well as sin(2$\beta$), and can therefore resolve an ambiguity in the determination of the apex of the CKM Unitarity Triangle. As part of the analysis, a full Dalitz plot amplitude analysis of $D\to K^0_S\pi^+\pi^−$ is performed on a high-statistics charm data set. We report the first evidence for cos(2$\beta$)>0, an observation of CP violation, and the exclusion of the second solution of the CKM Unitarity Triangle of $\beta=68.1\pm0.7$ degrees at a significance of 7.3 standard deviations.

Speaker: Dr Tomonari Miyashita (Caltech)

Slides 157-0-CP_Violation.pdf

93 Determination of $V_{ub}$ and $V_{cb}$

Semileptonic decays of $B$ mesons involving low-mass charged leptons $e$ or $\mu$ are expected to be free of non-Standard Model contributions and therefore play a critical role in determinations of $\vert V_{cb} \vert$ and $\vert V_{ub} \vert$ ($\vert V_{qb} \vert$). Decays of the form $b \to c \ell \bar \nu_\ell$ and $b \to u \ell \bar \nu_\ell$ allow us to determine these matrix elements and test the CKM sector of the Standard Model. The theory underlying the determination of $\vert V_{qb} \vert$ is mature and experimental measurements are precise. However, the difference between exclusive and inclusive determinations persist even as the theoretical and experimental errors get smaller with more statistics, better theoretical calculations, and more precise measurements. Of all the CKM matrix parameters, $\vert V_{ub} \vert$ is the least precise and in most need of additional studies in order to constrain the apex of the unitarity triangle even further. We present the procedures and latest results for exclusive and inclusive determinations of $\vert V_{qb} \vert$.

Speaker: Mr Matic Lubej (Jozef Stefan Institute)

Slides 216-1-CIPANP2018_dev.pdf

94 First Collisions at Belle II

The Belle II experiment at the asymmetric energy $e^+e^-$ collider SuperKEKB is a next generation B-factory, taking advantage of an upgrade of the collider complex to deliver about 40$\times$ the luminosity that was available to Belle. Together with a state-of-the-art detector upgrade, a rich physics program will be accessible by Belle II. Highlights are beyond-the-standard-model physics searches in precision measurements of the flavor sector and a rich spectroscopy program. Belle II is set to see first collisions at the end of April of this year, and by the time of this presentation, the second commissioning phase with beam and the full detector, except the vertex detector, will be in full swing. This talk will give the status of the commissioning as well as an outlook of the physics program with a focus on measurements possible with data from phase II.

Speaker: Anselm Vossen (Duke University/JLab)

Slides 189-0-Cipanp2018_FirstBeam_VossenV2.pdf

Neutrino Masses and Neutrino Mixing: Parallel 3 — Reactor Neutrinos

Conveners: Prof. Andre de Gouvea (Northwestern University), Daniel Dwyer

95 Reactor Neutrino Oscillation at Daya Bay

The Daya Bay reactor neutrino experiment continues to provide leading measurements of the mixing angle $\theta_{13}$ as well as important constraints on the atmospheric mass splitting, reactor flux models, and light sterile neutrinos. This talk begins with a review of Daya Bay's existing oscillation analysis based on 1,230 days of data. We then discuss the enhancements in our forthcoming result (to be announced at Neutrino 2018), including increased statistics, improved reconstruction, a revised energy model, updated background estimates, and various reductions in other systematic uncertainties. We conclude with a preview of other upcoming publications from Daya Bay.

Speaker: Matthew Kramer

Slides 249-0-dayabay_cipanp_talk.pdf

96 Latest Results of the Double Chooz Experiment

Double Chooz is a reactor neutrino disappearance experiment with the purpose of a precise measurement of the neutrino mixing angle $\theta_{13}$. The experimental set-up consists of two identical liquid scintillator detectors, one at a longer baseline of about 1 km since 2011 and a closer one with a distance of about 400 m since 2014. This double-detector set-up with an essential iso-flux configuration allows one to fit the far detector data to the near detector data without relying on the reactor neutrino flux predictions, where systematic uncertainties are suppressed to per mill levels. Statistical uncertainties are reduced by adding the delayed signal of the Hydrogen neutron capture in addition to Gadolinium, which yields an increase of more than a factor two in statistics. By performing a global fit of the energy dependent neutrino rates and shapes in both detectors simultaneously, the neutrino mixing angle $\theta_{13}$ can be obtained. The latest results of the Double Chooz collaboration are presented in this talk.

Speaker: Mr Philipp Soldin (RWTH Aachen University Germany)

Slides 285-0-Berkeley_Soldin_2018.pdf

97 PROSPECT: a Precision Reactor Oscillation and SPECTrum Short-Baseline Antineutrino Experiment

PROSPECT (Precision Reactor Oscillation and SPECTrum) is a short-baseline reactor antineutrino experiment. PROSPECT consists of a segmented 4-ton $^6$Li liquid scintillator antineutrino detector that will precisely measure the $^{235}$U fission antineutrino spectrum from the High-Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). PROSPECT’s high statistics and high resolution measurements of the antineutrino energy spectrum and flux from HFIR’s $^{235}$U core will be vital to understanding the discrepancies between predicted and measured antineutrino spectra and fluxes observed in previous commercial power reactor neutrino experiments; in addition, PROSPECT will search for the existence of sterile neutrino oscillations at the eV-scale. PROSPECT’s assembly was completed in late 2017 and data taking at HFIR began in 2018. This talk will explain PROSPECT’s physics objectives, describe its experimental design, and cover its installation and initial data-taking at ORNL.

Speaker: Prof. Bryce Littlejohn (IIT)

98 Accelerator and Reactor Complementarity in Coherent Neutrino-Nucleus Scattering

Coherent elastic neutrino-nucleus elastic scattering (CE$\nu$NS) experiments can be used to constrain new physics in the form of non-standard neutrino interactions (NSI). First, we consider the current data from the recent observation by the Coherent experiment within a Bayesian framework. Second, we demonstrate the complementarity of future reactor and accelerator experiments, by employing at least two distinct target materials at each source. This enables a degeneracy between up and down flavor-diagonal NSI terms to be broken. Considering four flavor-diagonal ($ee/\mu\mu$) up- and down-type NSI parameters, we find that all terms can be measured with high local precision (to a width as small as $\sim$5% in Fermi units) by next-generation experiments.

Speaker: Dr Jayden Newstead (Arizona State University)

Slides 22-0-CIPANP2018_JLN.pdf

Particle and Nuclear Astrophysics: Parallel 3 — Nuclear Astrophysics

Conveners: Dr Barry Davids (TRIUMF), Wick Haxton

99 Stellar Explosions in the Lab: Measurements of Key Nuclear Reactions Driving Nucleosynthesis

Stellar explosions such as novae, supernovae, X-ray bursts, and neutron star mergers are responsible for the synthesis of a large fraction of the terrestrial elements. Nucleosynthesis in explosive environments is driven by rapid successions of nuclear reactions and decays. In order to understand the dynamics and isotopic yields of stellar explosions, it is essential that the rates of the underlying nuclear reactions be well understood. Hence both direct and indirect laboratory measurements of key nuclear reactions involved in the nucleosynthesis processes are essential for a complete understanding of explosive stellar nucleosynthesis. Many of these reactions proceed away from the valley of nuclear stability, leading to the requirement that radioactive beams be employed for measurements. In this talk, I will give an overview of recent state-of-the-art efforts to constrain explosive stellar nucleosynthesis through direct and indirect laboratory measurements. In particular, I will focus on measurements pertaining to radiative proton capture reactions that are important in classical novae. This will include a discussion of recent direct measurements using the DRAGON recoil mass separator and radioactive beams from the ISAC-I facility at TRIUMF. I will also discuss a new program under development at the Texas A&M University Cyclotron Institute, targeted at performing indirect measurements of radiative proton capture using re-accelerated radioactive beams.

Speaker: Prof. Greg Christian (Texas A&M University)

Slides 125-0-CIPANP18.pdf

100 Nuclear Astrophysics Underground: Status & Future

Even 60 years after the groundbreaking publication by Burbidge, Burbidge, Fowler, and Hoyle, Nuclear Astrophysics is still a thriving research field at the interface of nuclear physics, astrophysics, and particle physics. An important topic is associated with the evolution of stars and its impact on the production of heavy elements. The study of the key reactions has been a major goal by the community, in Europe, the US and also in China. However, the cosmic ray induced background has been prohibitive for advancing these measurements into the stellar energy range and reaction rates rely on theoretical extrapolations. Accelerator laboratories, located deep underground offer unique conditions for measuring these reactions at low energies as demonstrated by the success of the LUNA facility at Gran Sasso, Italy. Over the past years the CASPAR laboratory has been commissioned at the Sanford Underground Research Facility (Lead, South Dakota) to address the further need for such facilities. CASPAR operates a 1MV, fully refurbished Van de Graaff accelerator that can provide beam intensities of more than 100 micro-Ampere. Furthermore, the LUNA-MV facility as well as the JUNA project in China’s Jinping Underground Laboratory will be operational in the near future. Successful implementation of a science program at these facilities result in significant progress in the field. The current status of the underground accelerator facilities for Nuclear Astrophysics will be reviewed.

Speaker: Prof. Frank Strieder (South Dakota School of Mines & Technology)

Slides 28-0-presentation_Strieder_CIPANP.pdf

101 Improving Astrophysical Nuclear Rates with New Many-Body and Fewer-Body Reaction Models

Nuclear and particle astrophysics has long relied on relatively crude models of nuclear reaction rates, because computational methods are lacking for systems of more than two particles and because empirical constraints on simplified models are scarce. $\textit{Ab initio}$ methods, which model nuclei using a quantitatively accurate nucleon-nucleon interaction and reasonably complete model spaces, now offer alternatives to the traditional reaction-by-reaction or systematics-based phenomenology. Particularly at $A<12$, there are now theoretical cross sections grounded directly in nucleon-level physics. I will give a quick overview of this work to date, emphasizing the significant further investments in each $\textit{ab initio}$ approach that are needed to produce accurate results with quantified errors. I will then argue that in the long run, these methods are unlikely to deliver astrophysical rates of the desired precision without inputs beyond the nucleon-nucleon interaction: rates are too sensitive to "finely tuned" numbers like threshold and resonance energies. It is therefore urgent to develop methods that can consistently incorporate complementary information from both $\textit{ab initio}$ and empirical data into "fewer-body" models like the empirical R-matrix or halo effective field theory (EFT), particularly in combination with Bayesian methods to provide quantified errors. I will illustrate this point with applications of halo EFT to rates in the solar pp-chain.

Speaker: Dr Kenneth Nollett (San Diego State University)

Slides 153-0-nollett_cipanp2018.pdf

102 Probing Explosive Nucleosynthesis with TwinSol Measurements

The nucleosynthesis occurring in astrophysical explosions can be very different than that which occurs in main sequence stars such as our sun. In fact, many of the properties of explosive astrophysical events are determined by the nuclear physics of the radioactive nuclei that power the explosion. At the University of Notre Dame TwinSol radioactive beam separator, exotic nuclei of astrophysical interest are being produced and studied in order to further our understanding of astrophysical explosions. In fact, TwinSol was one of the first such devices in the United States dedicated to radioactive beam production. Recent studies include the first neutron angular distribution measurement from a (d,n) reaction on an exotic beam and some of the most precise half-life measurements to constrain elements in the CKM matrix. These studies along with future plans and upgrades will be presented.

Speaker: Dan Bardayan (University of Notre Dame)

Slides 86-0-bardayan_cipanp2018.pptx

103 Sensitivity Study for the $^{12}$C($\alpha,\gamma$)$^{16}$O Astrophysical Reaction Rate

The $^{12}$C($\alpha,\gamma$)$^{16}$O reaction has a key role in nuclear astrophysics. A multilevel R-matrix analysis was used to make extrapolations of the astrophysical S factor for this reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation was determined by performing multiple fits to randomized (according to the experimental errors) existing E1 and E2 ground state data. The impact of a future proposed experiment at Jefferson Laboratory (JLab) was assessed within this framework. The proposed JLab experiment will make use of a high-intensity low-energy bremsstrahlung beam that impinges on an oxygen-rich single-fluid bubble chamber in order to measure the total cross section for the $^{16}$O($\gamma,\alpha$)$^{12}$C reaction. The importance of low energy data as well as high precision data was investigated. The results of this study will be presented.

Speaker: Roy Holt (California Institute of Technology and Argonne National Laboratory)

Slides 94-0-Holt_16O_r_matrix.pdf

Precision Physics at High Intensities: Parallel 3 — g-2

Convener: Prof. Aida El-Khadra (University of Illinois at Urbana-Champaign)

104 The Commissioning Run Update of the Muon g-2 Experiment at Fermilab

The Muon g-2 Experiment (E989) at Fermilab is measuring the anomalous magnetic moment of the muon $a_{\mu}$, aiming at improving the precision to 140 parts-per-billion (ppb) and resolving the standard deviation between the previous measurement of $a_{\mu}$ and the Standard Model calculation of $a_{\mu}$. In E989, the muon beam is stored in a ring magnet. The spin precession frequency $\omega_{a}$ is measured by counting the decay positrons in 24 calorimeters, and the magnetic field is measured by nuclear magnetic resonance (NMR) probes. Important improvements of this experiment and the progress of the commissioning run will be presented.

Speaker: Dr Ran Hong (Argonne National Laboratory)

Slides 279-0-G2CommissionningRunFull_v2.pdf

105 Hadronic Contributions to Muon g-2 and Spin Structure Functions

I will discuss the relation, viz. Schwinger's sum rule, between the g-2 and the spin structure functions. It allows one to assess the hadronic (as well as other) contributions to muon g-2 by measuring the structure function. The latter can be accessed experimentally in inelastic muon-electron scattering. I will outline the prospects of such measurements at the muon-beam facilities. This presentation is based on: F. Hagelstein and V. Pascalutsa, Phys.Rev.Lett. 120 (2018) no.7, 072002 [DOI: 10.1103/PhysRevLett.120.072002]

Speaker: Dr Vladimir Pascalutsa (University of Mainz)

Slides 1-0-Pascalutsa_g-2_CIPANP_IndianWells_May2018.pdf

106 Dispersive Analysis of Hadronic Light-by-Light Scattering and the Muon's (g-2)

In my talk, I will present our recent dispersive analysis of the $\gamma \gamma^\star \to \pi\pi, \pi\eta$ processes from the threshold up to 1.4 GeV in the two photon invariant mass. These amplitudes serve as important input to constrain the hadronic piece of light-by-light scattering contribution to (g-2) and support the current experimental program at BESIII. As well, I will present an application of the light-by-light scattering sum rules to the $\gamma \gamma^\star$-production of mesons in light of the new data by the Belle Collaboration on the transition form factors.

Speaker: Prof. Marc Vanderhaeghen (Johannes Gutenberg-Universität Mainz)

Slides 7-0-gminus2_vanderhaeghen_CIPANP2018.pdf

107 Hadronic Matrix Elements for Muon g–2 in Lattice QCD

The muon anomalous magnetic moment is a subject of intense focus for theoretical and experimental particle physics at this time. This quantity is especially sensitive to new physics, so the current tension with Standard Model predictions makes the anomalous magnetic moment especially exciting. The muon $g-2$ can be measured with high precision, and predictions from theory must be similarly precise to be informative. However, some pieces of the theory prediction that include hadronic matrix elements are difficult or impractical to determine experimentally, and predictions from models lack robustly quantitative statements about the uncertainty. To circumvent this issue, these hadronic matrix elements may be determined precisely with lattice QCD. In this talk, I will give an overview of recent developments in lattice QCD to address the hadronic matrix elements, including the hadronic light-by-light (HLbL) and hadronic vacuum polarization (HVP) diagrams. With these improvements to the theory, it will be possible to match the expected experimental precision in time for the completion of the Fermilab $g-2$ experiment.

Speaker: Dr Aaron Meyer (Brookhaven National Laboratory)

Slides 256-0-cipanp0.1.pdf

108 Measurement of Hadronic Cross Sections at BESIII

The uncertainties of the Standard Model prediction of the anomalous magnetic moment of the muon are currently completely dominated by hadronic contributions. The largest contribution is due to the hadronic vacuum polarization. Hadronic cross sections measured at $e^+e^-$ colliders can be exploited as experimental input to improve the calculations, making use of the optical theorem. At the BESIII experiment in Beijing these cross sections are determined using different methods. At center-of-mass energies above 2 GeV, exclusive and inclusive cross sections can be measured in an energy scan. Additionally, cross sections can be determined starting from the $\pi^+\pi^-$ mass threshold using the method of Initial State Radiation. This presentation will give an overview of the recent results and the current status of the analyses.

Speaker: Dr Christoph Florian Redmer (Institute for Nuclear Physics, Johannes Gutenberg-University Mainz)

Slides 287-0-CFR180530.pdf

15:40 Break

Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity: Parallel 4 — 21 cm Cosmology | LIGO

Conveners: Kev Abazajian (UC Irvine), Prof. Neelima Sehgal (Stony Brook University)

109 Searching for Dark Matter at the Cosmic Dawn​

The nature of the dark matter is still a mystery, although current and upcoming 21-cm measurements during the cosmic dawn​ can provide ​a new arena on the search for​ the cosmological dark matter. ​This era saw the formation of the first stars, which coupled the spin temperature of hydrogen to its kinetic temperature---​producing 21-cm absorption in the CMB. The strength of this absorption acts as a thermostat, showing us if the baryons have been cooled down or heated up by different processes. In particular, during ​the cosmic dawn, the baryon-dark matter fluid is the​ slowest​ it will ever be​, making it ideal to search for dark matter elastically scattering with baryons through massless mediators, such as the photon. ​I will describe how dark-matter particles with an electric “minicharge” can significantly alter the baryonic temperature, and thus explain the anomalous 21-cm depth observed by the EDGES collaboration.

Speaker: Dr Julian Munoz (Harvard University)

Slides 29-1-CIPANP.pdf

110 A Particle Physicist's Perspective on the EDGES Anomaly

In a recent pair of Nature papers, Bowman $\textit{et al.}$ claimed a detection of an anomalously low 21 cm brightness temperature at a redshift of 17, and Barkana interpreted this as evidence of cold dark matter that was scattering with baryons at that cosmic epoch. In this talk, I will discuss constraints available in the particle physics literature, and future directions for particle, astro, and nuclear physics in the wake of the EDGES observation. A number of independent groups have found that cosmological constraints limit only a subdominant fraction of the dark matter particles to be able to participate in this scattering, and that even this limited scenario is strongly bounded by complementary terrestrial considerations. The prospects for investigating this small remaining region of viable parameter space are discussed in both terrestrial and astrophysical contexts.

Speaker: Dr Samuel McDermott (FNAL)

Slides 246-0-cipanp-mcdermott-mcdm.pdf

111 Realizing the Promise of 21 cm Cosmology with HERA

21 cm cosmology promises to provide an exquisite and perhaps revolutionary new 3D probe of our early universe. With it, we can uncover the astrophysics of the first luminous objects in the universe, improve CMB constraints on cosmological parameters, and cross-check the recent EDGES detection of an anomalously large absorption feature that points tantalizingly at new physics. However, realizing that promised probe of the astrophysics and cosmology of the the "Cosmic Dawn" and the epoch of reionization (EoR) has proven extremely challenging. We're looking for a small signal buried under foregrounds orders of magnitude brighter. We need large interferometers, precisely calibrated, producing mountains of data to have any shot of seeing the signal. In this talk, I will present the Hydrogen Epoch of Reionization Array, a purpose-built interferometer currently under construction in South Africa that is designed not just to detect the EoR but to characterize its evolution and to push deeper into the Cosmic Dawn. I will discuss the analysis techniques we've developed and the progress we've made separating the 21 cm from astrophysical foregrounds.

Speaker: Dr Josh Dillon (UC Berkeley)

Slides https://www.dropbox.com/s/bgabc7jl3515ikl/5-30-18-Dillon-CIPANP.key?dl=1

112 21 cm Dark Energy Cosmology with CHIME

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a new radio transit interferometer now taking data at the Dominion Radio Astrophysical Observatory (DRAO) in Penticton, BC, Canada. We will use the 21 cm emission line of neutral hydrogen to map baryon acoustic oscillations between 400–800 MHz across 3/4 of the sky. These measurements will yield sensitive constraints on the dark energy equation of state between redshifts 0.8–2.5, a fascinating but poorly probed era corresponding to when dark energy began to impact the expansion history of the Universe. I will describe the CHIME instrument, the analysis challenges, the calibration requirements, and current status.

Speaker: Prof. Laura Newburgh (Yale University)

Slides 88-0-2018_05_CIPANP_LNewburgh.pdf

113 Gravitational-Wave Transient Astronomy on the Rise

The past three years have encompassed a meteoric rise of gravitational-wave astronomy with the activation of the first advanced gravitational-wave interferometers and the subsequent direct detection of GW150914 --- a gravitational-wave transient from a merging binary black hole. Since then, two observing runs, spanning about a year of total observation time, have been completed and recently included the kilometer-scale French-Italian Virgo instrument. The payoff, a monumental joint electromagnetic and gravitational-wave campaign surrounding GW170817, added a crucial and highly anticipated component to multi-messenger astronomy. Primary among a rich set of results, this watershed event provided an unequivocal and long-anticipated link between short gamma-ray bursts, kilonovae, and binary neutron star mergers. I will report the key results driving the birth and growth of gravitational-wave astronomy: stellar mass black hole binaries and their implications for compact binary astrophysics, tests of general relativity, and the foundation for future studies. I will also enumerate the timeline and ongoing studies of GW170817/GRB170817A. Finally, I will review the progression towards a truly worldwide network of second generation gravitational-wave interferometers.

Speaker: Dr Chris Pankow (Northwestern University)

Slides 33-0-Pankow_LIGO_Astrophysics.pdf

114 Did LIGO Detect Dark Matter?

I will discuss the possibility that the black-hole binary detected by LIGO may be a signature of primordial black hole dark matter. If two BHs in a galactic halo pass sufficiently close, they radiate enough energy in gravitational waves to become gravitationally bound. Curiously, the expected merger rate from these objects overlaps with that predicted by LIGO. Although a PBH dark matter fraction of unity is now ruled out, a smaller fraction is still plausible.

Speaker: Prof. Simeon Bird (UCR)

Slides 27-0-CIPANP.pdf

115 The Cosmic Origin of the Heavy Elements: Implications from the Neutron Star Merger GW170817

The recent detection of the binary neutron star merger GW170817 by LIGO and Virgo was followed by a firework of electromagnetic counterparts across the entire electromagnetic spectrum. In particular, the ultraviolet, optical, and near-infrared emission is consistent with a kilonova that provided strong evidence for the formation of heavy elements in the merger ejecta by the rapid neutron capture process (r-process). In this talk, I will discuss our current understanding of how kilonovae are produced by neutron star mergers and how r-process nucleosynthesis in these outflows can explain the cosmic origin of the heavy elements in the universe, which has been an enduring mystery for more than 70 years.

Speaker: Dr Daniel Siegel (Columbia University)

Slides 288-0-CIPANPMay2018_short.pdf

DM / PPHI: Parallel 4 — Dark Photons

Convener: Renee Fatemi (University of Kentucky)

116 Hidden Sectors and Dark Photons

Dark Matter (DM) provides strong evidence for physics beyond the Standard Model (SM). Arguably, rather than suggesting a specific mass scale for New Physics, it may point to a dark sector, weakly-coupled to the SM, as hinted at by the comparable abundances of dark matter and visible baryons. In the past few years, a program of new experiments has expanded DM searches far beyond the WIMP paradigm to include new hidden forces and matter. In this talk, I will give an overview of dark photon models and of the present and future experimental effort in testing these models at high intensity facilities.

Speaker: Prof. Stefania Gori (University of Cincinnati)

Slides 297-0-TalkCIPANP.pdf

117 Searches for Hidden Sectors with BABAR

Many models of physics beyond the Standard Model (SM) predict new, hidden-sector particles with masses below the electroweak scale. These models are motivated by solutions to the dark matter problem, the hierarchy problem, neutrino masses, and other physics that is not accounted for in the SM. Low-energy electron-positron colliders such as BABAR are ideally suited to discover these hidden-sector particles. We present several BABAR searches for low-mass hidden-sector particles, including visibly and invisibly decaying dark photons, and a dark muonic force. These examples show the importance of B-factories in discovering and constraining new hidden-sector physics beyond the SM.

Speaker: Brian Shuve (Harvey Mudd College)

Slides 60-0-CIPANP_Shuve_BABAR.pdf

118 Direct Search for Dark Photons and Dark Higgs with the SeaQuest Spectrometer at Fermilab

The SeaQuest experiment has been in operation since 2011 and is designed to study nuclear dependent Drell-Yan productions in the dimuon channel using the high intensity 120 GeV proton beam from the Main Injector on various thin nuclear targets (about $\sim0.1$ nuclear interaction lengths each). It provides an ideal setting for dark photon and dark Higgs search in a parameter space of great interest. In this energy, through kinetic mixing, the postulated low-mass ($ \sim < 10$ GeV) dark photon (and/or dark Higgs) particles could be produced in the Drell-Yan like $q+\bar{q}$ (or $g+g$) fusion processes in high energy proton + nucleus collisions, mostly in the beam dump ($p+Fe$) and decay into dimuons (or di-electrons). For this search, a dedicated displaced-vertex trigger detector was built, installed and commissioned with upgraded DAQ in 2017. This trigger uses two planes of extruded scintillators to identify dimuons originating far downstream of the target, and is sensitive to dark photons (dark Higgs) that travel deep inside the beam dump before decaying to dimuons. We successfully took one week worth of production data parasitically with the E906 experiment in 2017. We will continue taking additional data parasitically alongside the upcoming SeaQuest polarized proton target physics program (E1039) for several years. In this talk we will present the latest status of the preliminary dark photon search from 2017 data and also discuss future opportunity.

Speaker: Dr Sho Uemura (LANL)

Slides 8-0-darkphoton-cipanp.pdf

119 The Beam Dump eXperiment

The Beam Dump eXperiment is an electron-beam thick-target experiment aimed to investigate the existence of Light Dark Matter particles in the MeV-GeV mass range. The experiment has been conditionally approved and is expected to run in a dedicated underground facility located about 20 m downstream of the JLab-Hall A beam-dump. The detector consists of two main components: a CsI(Tl) electromagnetic calorimeter (ECal) and a veto system used to suppress the background. The expected signature of the DM interaction in the Ecal is a $\sim$ GeV electromagnetic shower paired with a null activity in the surrounding active veto counters. A complete small-scale prototype of the final detector has been constructed in order to validate the proposed technology and demonstrate the capability to reject the cosmogenic background. Beam-related background was estimated by means of Monte Carlo (MC) simulations. In order to benchmark our simulation tools with on site data, we recently measured, with JLab support, the muon background produced by the 10.6 GeV $e$-beam on the Hall-A dump at the location of the proposed BDX facility with present shielding configuration. A hodoscope made by a BDX ECal CsI(Tl) crystal sandwiched between a set of segmented plastic scintillators was used to measure the muon rate. This talk will present an overview of the BDX experiment with a particular focus on the results of the recent muon-flux measurements and the comparison with the corresponding simulations.

Speaker: Dr Mariangela Bondi' (INFN - Sez. Catania)

Slides 16-0-CIPANP2018_bondi.pdf

120 Search for Light Dark Matter with the MESA Accelerator

At the Institute for Nuclear Physics of the Johannes Gutenberg University in Mainz, the construction of the MESA facility has started. At its core there is a new superconducting energy-recovery linac which will provide intense electron beams for precision experiments in subnuclear physics. An important part of the MESA physics program consists of the search for a "dark sector" which is a candidate explanation for the longstanding dark matter problem. This talk will highlight the MESA dark sector program and in particular two experiments will be described. The first one is called MAGIX and it is a two-spectrometer set-up employing an internal gas-jet target installed on a recirculation arc of MESA. The second one is a beam-dump experiment for directly detecting dark matter particles. The experiments are in the R&D phase and the current status and future prospects will be presented.

Speaker: Dr Luca Doria (University of Mainz)

Slides 351-0-Doria_CIPANP18.pdf

121 Searching for New Forces with Dark Light

Cosmic motivations and anomalies in precision measurements have encouraged standard model extensions in the form of Dark Photons or, more generically, a new force-carrier. Existing experimental searches for such particles have probed the majority of the parameter space of simple models, but so far no culprit has been found and the standard-model anomalies remain unexplained. The recent report of anomalous correlations in $^8$Be transitions has heightened interest in a potential new particle near 17 MeV. Although this region has been partially explored via hadronic production mechanisms, a particle with proto-phobic couplings is more effectively probed using leptonic production. The DarkLight experiment proposes to search for this particle in the invariant mass spectrum of $e^+e^-$ pairs produced in electron-nuclear scattering. I will give an overview of the staged approach we have taken, including recent tests at the LERF facility at JLab and designs for a future large-acceptance detector, and also our near-term proposal to install a spectrometer pair at the CEBAF Injector to search for this signal in an intensity regime where backgrounds from accidental coincidence dominate.

Speaker: Dr Ross Corliss (MIT)

Slides 265-0-DarkLight-Corliss-CIPANP.pdf

122 Resonance Search for a Heavy Photon with the Heavy Photon Search Experiment

The Heavy Photon Search (HPS) experiment at Jefferson Lab is searching for a hypothetical new $U(1)$ vector boson ("heavy photon", "dark photon" or $A^{^/}$) in the mass range of 20–500 MeV/$c^2$. An $A^{^/}$ in this mass region is natural in hidden sector models of light, thermal dark matter. The $A^{^/}$ couples to the ordinary photon through kinetic mixing, which induces its coupling to electric charge. Since heavy photons couple to electrons, they can be produced through a process analogous to bremsstrahlung, subsequently decaying to an $e^+e^-$, which can be observed as a narrow resonance above the dominant QED trident background. For suitably small couplings, heavy photons travel detectable distances before decaying, providing a second signature. Using the CEBAF electron beam, located at the Thomas Jefferson National Accelerator Facility, incident on a thin tungsten target, along with a compact, large acceptance forward spectrometer consisting of a silicon vertex tracker and lead tungstate electromagnetic calorimeter, HPS can access unexplored regions in the mass-coupling parameter space. HPS conducted successful engineering runs in 2015 using a 1.056 GeV, 50 nA beam and 2016 using a 2.3 GeV, 200 nA beam. This talk will present the results of a resonance search for a heavy photon using the 1165 nb$^{-1}$ (7.29 mC) of data collected during the 2015 engineering run.

Speaker: Omar Moreno (SLAC National Accelerator Laboratory)

Slides 260-0-20180529_hps_cipanp.pdf

123 The APEX Experiment at Jefferson Lab: A Search for a New Vector Boson

The A' Experiment, or APEX, aims to search for a new vector boson that kinetically mixes with the photon, a "dark photon" or a "heavy photon", with a mass of $\mathcal O$(100 MeV) by studying the invariant mass spectrum of $e^+e^-$ pairs produced from an electron beam on a high-Z target. Dark photons appear in many well-motivated extensions of the Standard Model and may mediate interactions between dark matter and ordinary matter. APEX will extend current constraints on the mixing parameter by a factor of a few for dark photon masses near 100 MeV. APEX is scheduled to take data at Jefferson Lab in early 2019, taking advantage of the high duty-factor electron beam and using the twin symmetric high resolution spectrometers in Hall A. An overview of the current constraints for such a boson and experimental plans will be presented.

Speaker: Dr Seamus Riordan (Argonne National Laboratory)

Slides 366-0-riordan_apex_cipanp18.pdf

Neutrino Masses and Neutrino Mixing: Parallel 4 — Higher Energy Neutrinos

Conveners: Prof. Andre de Gouvea (Northwestern University), Daniel Dwyer

124 Recent Long-Baseline Neutrino Mixing Results from NOvA

Neutrinos are elusive fundamental particles only directly detectable through weak interactions, and they may be the key to understanding supernovae, the matter-antimatter asymmetry in the universe, and more. Neutrinos oscillate, where they change flavor as they travel due to being in a quantum superposition of states with different masses, which has already forced us to amend the Standard Model. The details of neutrino oscillations are still being unraveled, and the US program of long-baseline neutrino oscillation experiments centered around the Fermi National Accelerator Laboratory is at the forefront of measuring such fundamental neutrino properties. In this talk I'll focus on the latest results from the NOvA experiment, where muon neutrinos are shot 810 km to a 14 kton liquid scintillator detector deep in the Minnesota forest.

Speaker: Kirk Bays (California Institute of Technology)

Slides 200-0-CIPANP_NOvA_2018May30.pdf

125 Neutrino Oscillation Results from the T2K Experiment

T2K is a long baseline neutrino oscillation experiment making use of Super-Kamiokande as its off-axis far detector that has been taking data since 2010. The results of the oscillation analysis with five far detector samples, including data taken up to May 2017 with a total of $14.7\times10^{20}$ POT accumulated in neutrino-mode and $7.6\times10^{20}$ POT in anti-neutrino mode, will be presented. In particular, these results have been produced with a new reconstruction algorithm for Super-Kamiokande, including re-optimized far detector event selections and expanded fiducial volume, with an effective statistical improvement of 30% compared to previous analyses.

Speaker: Cristovao Vilela (Stony Brook University)

Slides 310-0-cvilela_CIPANP2018_T2K_OA.pdf

126 The Short Baseline Neutrino Oscillation Program at Fermilab

Neutrino Oscillation, i.e., discovery that neutrinos have mass, is perhaps the most striking recent experimental evidence of physics which found a crack in the Standard Model to give us a glimpse of the fundamental underlying theories. The Short-Baseline Neutrino (SBN) program makes use of a trio of LArTPC (Liquid Argon Time Projection Chamber) detectors — named the Short-Baseline Near Detector or SBND, MicroBooNE and ICARUS — positioned along Fermilab’s Booster Neutrino Beam (BNB), to address the previously observed short-baseline neutrino anomalies. LArTPC is a state-of-the-art technology for studying these mysterious particles and building massive neutrino detectors. LArTPCs provide 3D imaging of interaction events with excellent spatial resolution. This scaleable detector technology allows us to make precision measurements of neutrino interactions. This talk will give an overview of the current and future short-baseline neutrino oscillation experiments, with a focus on the MicroBooNE experiment, and will discuss the prospects of addressing the short-baseline anomalies in the near future.

Speaker: Dr Jyoti Joshi (Brookhaven National Laboratory)

Slides 321-0-CIPANP_30May2018.pdf

127 Characterizing Single-Phase LArTPC Detector Performance with MicroBooNE

With many current and future neutrino experiments relying on Liquid Argon Time Projection Chamber (LArTPC) technology, characterizing the performance of these detectors is critical. The MicroBooNE LArTPC experiment is capable of performing numerous measurements to better understand the technology. These include identification and filtering of excess TPC noise, signal calibration and measurements of attenuation of drifting electrons, as well as diffusion and recombination. MicroBooNE, residing on the surface, can also provide useful information about cosmic ray rate and the build up of space charge in the TPC volume. A laser calibration system has been designed and employed to investigate these important effects.

Speaker: Mr Christopher Barnes (University of Michigan)

Slides 162-0-CIPANP_Practice_Talk_FINAL_CRB.pdf

128 Event Reconstruction Techniques for ANNIE Phase II

The Accelerator Neutrino Neutron Interaction Experiment (ANNIE), deployed on the Booster Neutrino Beam (BNB) at Fermilab, is planning to use a 26-ton Gd-doped water Cherenkov detector to study the multiplicity of final state neutrons from neutrino-nucleus interactions in water, which provides a unique opportunity to study this physics in an energy range relevant to both atmospheric and long baseline neutrino experiments. The experiment has two main goals: (1) perform the first measurement of the abundance of neutrons from neutrino interactions in water, as a function of momentum transfer, in order to constrain neutrino-nucleus interaction models, and (2) demonstrate the power of new fast-timing, position-sensitive detectors by making the first deployment of the Large Area Picosecond PhotoDetectors (LAPPDs) in a physics experiment. The Phase I of ANNIE has successfully measured the neutron background inherent to the BNB. The Phase II of ANNIE will realize the physics measurements by using the arrival time and position of the Cherenkov photons in both PMTs and LAPPDs. The interaction vertices and the charged lepton tracks are reconstructed by using a maximum likelihood fit. The energies of the charged lepton and the neutrino are reconstructed by using Machine and Deep Leaning algorithms. This presentation will give an overview of the ANNIE Phase II simulation and present the recent development of event reconstruction techniques.

Speaker: Dr Jingbo Wang (UC Davis)

Slides 195-0-ANNIE_reconstruction_CIPANP_v2_JWang.pdf

129 Theia: A Multi-Purpose Water-Based Liquid Scintillator Detector

Recent developments in the field of liquid scintillator chemistry and fast-timing photosensors paved the way for a new generation of large-scale detectors capable of tackling a broad range of physics issues. Water-based Liquid Scintillator (WbLS) is a novel detection medium that combines the advantages of pure water, including low attenuation, accurate direction reconstruction, and low cost, and those of liquid scintillator, including high light yield and low-threshold detection. When coupled with high efficiency, fast-timing photosensors, such as Large Area Picosecond PhotoDetectors (LAPPDs), WbLS exhibits an immense potential for neutrino physics and BSM searches. Theia is a 50-kiloton multi-purpose neutrino detector that aims to jointly deploy these two technologies in order to fulfill its physics program objectives, including the determination of the neutrino mass hierarchy and the CP violation phase in the leptonic sector, the detection of solar, reactor, and supernova neutrinos, and the search for neutrinoless double beta decay and proton decay. This presentation will describe the physics potential and the experimental setup of the Theia detector.

Speaker: Dr Vincent Fischer (UC Davis)

Slides 34-0-Theia_CIPANP2018_FISCHER.pdf

Nuclear Forces and Structure, NN Correlations, and Medium Effects: Parallel 4 — Color Transparency | EMC Effect | Coulomb Sum Rule

Convener: Prof. Gerald Miller (University of Washington)

130 Understanding the EMC Effect Through Tagged Processes with ALERT

Spectator tagged hard processes can provide insight into the origins of the EMC Effect by identifying the struck nucleon. A comprehensive program of experiments on light nuclei (deuterium and $^4$He) at JLab using the CLAS12 spectrometer and a Low Energy Recoil Tracker (ALERT) will detect the low energy nuclear spectator system (p, $^3$H and $^3$He) in a variety of hard scattering processes. Tagged deep inelastic scattering will provide stringent tests leading to clear differentiation between the many models describing the EMC Effect by accessing the bound nucleon virtuality through its initial momentum at the point of interaction. Furthermore, spectator-tagged deeply virtual Compton scattering will provide a measurement of off-forward EMC Effect as a new indicator of potential nuclear modifications of a bound nucleon. We will discuss details of the ALERT detector and measurements that will help understand the origin of the EMC Effect.

Speaker: Whitney Armstrong (Argonne National Lab)

Slides 215-0-ALERT_tagged_processes_CIPANP_May_2018.pdf

131 Update on the Jefferson Lab Hall A Tritium Experiments

A large body of evidence suggests isospin symmetry plays a key role in the EMC effect, the modification of quark distribution functions in the nuclear medium, as well as short-range correlated pairing between nucleons. Electron scattering experiments that probe the momentum distributions of quarks or of nucleons are limited to nuclei near the valley of stability, in a narrow band of proton-neutron asymmetry, making it difficult to learn about how this asymmetry affects the nuclear environment. Tritium and helium-3, being highly asymmetric isospin-mirror nuclei, present a special opportunity; by comparing electron scattering from tritium and helium-3, as well as from deuterium, isospin symmetry can be exploited to disentangle the u- and d-quark EMC effects and the isospin dependence of short-range correlations. This past spring, a first round of experiments were completed at Jefferson Lab's Hall A using sealed-cell tritium and helium-3 targets, in order to look at electron scattering in deep-inelastic and quasi-elastic kinematics. These experiments will offer a one-of-a-kind look at the isospin dependence of the nuclear medium. In this talk, an overview of the three recent Hall A experiments and their physics goals will be presented.

Speaker: Dr Axel Schmidt (MIT)

Slides 323-0-schmidt_cipanp.pdf

132 New Measurements of the EMC Effect in Hall-C at Jefferson Lab

The $x$ dependence of the EMC effect has been measured for a variety of nuclei in a multitude of experiments conducted over the past 35 years. Previous EMC ratio measurements for light nuclei $(A \leq 12)$ have shown a dependence on the local nuclear structure of nucleons and the associated modification to nuclear structure functions. The newly commissioned Super High Momentum Spectrometer (SHMS) in Hall-C has been used to collect inclusive electron scattering measurements on various light nuclei utilizing the 12 GeV CEBAF facility at Jefferson Lab. These data obtained during a portion of E12-10-008 includes previously unmeasured nuclei, namely $^{10}$B and $^{11}$B, and will therefore provide a comparison of nuclei which differ by just one nucleon. This will facilitate the extraction of the nucleon structure function as modified by the nuclear medium. Status of the target-ratio analysis of recently acquired E12-10-008 data will be discussed.

Speaker: Dr Eric Pooser (Jefferson Lab)

Slides 183-0-pooser_cipanp_2018.pdf

133 The Search for the Onset of Color Transparency

We will give an overview of a unique prediction of Quantum Chromodynamics, called color transparency (CT), where the final (and/or initial) state interactions of hadrons with the nuclear medium must vanish for exclusive processes at high momentum transfers. We will trace the progress of our understanding of this phenomenon, beginning with its confirmation in high energy phenomena, followed by investigations of the onset of CT at intermediate energies. We will present updates from a recent CT search experiment that was completed as one of the commissioning experiments of the newly upgraded experimental Hall C at the Jefferson Lab. We will also make connections between the CT experiment and the other commissioning experiments, which include experiments measuring the F$_2$ structure function and the EMC effect. Finally, we will also discuss some new proposals that will extended the search to new unexplored phase space.

Speaker: Prof. Dipangkar Dutta (Mississippi State University)

Slides 113-0-cipanp18_Dutta.pdf

134 The Search for the Color Transparency in Hall C at Jefferson Lab

Color transparency (CT) is a fundamental phenomenon of QCD postulating that at high momentum transfer hadrons fluctuate to a small color neutral transverse size in the nucleus, and final state interactions within the nuclear medium are suppressed. CT is observed experimentally as a rise in the measured nuclear transparency as a function of the momentum transferred. While CT has been observed for mesons, it remains unconfirmed in baryons. Observation of CT in baryons would provide a new handle for understanding the nuclear strong force and the first observations of hadrons fluctuating to a small size in the nucleus. An enhancement in the nuclear transparency was observed in A$(p,2p)$ reactions at Brookhaven. This experiment seeks to confirm the measurement of proton transparency as well as to measure the onset. During the spring of 2018, this experiment was the first to run in Hall C at Jefferson Lab using the recently upgraded 12 GeV electron beam and obtained four kinematic points covering the region where Brookhaven previously observed an enhancement. This experiment used the High Momentum Spectrometer (HMS) and Super High Momentum Spectrometer (SHMS) in coincidence to measure A$(e,e'p)$. This talk will summarize the status of the experiment since the completion of data taking this spring.

Speaker: Holly Szumila-Vance (Jefferson Lab)

Slides 134-0-cipanp_palmsprings_2018.pdf

PGDNN / QMHI: Parallel 4 — Nuclear PDFs and Heavy Ion Physics

Conveners: Prof. Jacquelyn Noronha-Hostler (Rutgers University), Dr Ralf Seidl (RIKEN)

135 Recent Progress in Nuclear Parton Distributions

Nuclear Parton Distribution Functions (nPDFs) are the non-perturbative objects that describe the behavior of partons in a nuclear medium, a natural extension of the free proton PDFs. Despite more than three decades of thorough study, the picture of nPDFs is far from being complete. In this talk I will present the current status of our knowledge and briefly discuss how current and future experiments can help broaden our understanding of matter.

Speaker: Dr Maria Zurita (Brookhaven National Laboratory)

Slides 144-0-CIPANP2018_PZ.pdf

136 Nuclear PDF, Small $x$ Physics Results at RHIC

The proton gluon distribution function increases rapidly with decreasing momentum fraction $x$ at fixed $Q^2$, but cannot increase indefinitely as $x$ decreases. Gluon saturation is expected at a low $x$ value when gluon recombination balances gluon splitting. The nuclear (with atomic mass number A) gluon distribution is approximately $A^{1/3}$ larger than the nucleon gluon distribution function at the same $x$. Understanding the kinematics of gluons in the low $x$ region will provide insights into the nuclear matter origin and improves the knowledge of Quantum Chromodyanmics (QCD) in the non-perturbative region. The Relativistic Heavy Ion Collider (RHIC) can probe gluons with $x$ between 0.001 and 0.02 inside the gold nuclei via forward di-jet or di-hadron measurements. Both STAR and PHENIX experiments have carried out a series of measurements to study the nuclear gluon distribution functions (nPDFs) and observed clear nuclear modification of the gluon PDF in the low $x$ region. Recent studies of forward inclusive hadron, di-hadron, di-jet and heavy flavor measurements in 200 GeV d+Au, $p$+Au, $p$+Al and $^3$He+Au collisions and 500/510 GeV $p$+$p$ collisions have extended the kinematic region of the probed proton/nuclear gluon distribution function. We will present selected results from RHIC in this talk. Prospects of future measurements from detector upgrades at PHENIX, sPHENIX and Electron Ion Collider (EIC) will be presented as well.

Speaker: Dr Xuan Li (Los Alamos National Lab)

Slides 111-0-CIPANP2018_PGDNN_XuanLi_lowx_v4.pdf

137 Cold-QCD Physics of the STAR Forward Upgrade

For almost twenty years, the STAR experiment at RHIC has played a leading role in expanding the frontier of nucleus-nucleus collisions and the interaction of spin-polarized beams of protons. In coming years, the STAR forward upgrade will enable new insight into cold nuclear matter, probing this physics at high and low regions of $x$. The proposed detector upgrades consist of electromagnetic and hadronic calorimetry as well as a charged-particle tracking system, each spanning the pseudorapidity range of $2.5 < \eta < 4.5$. Building upon existing STAR measurements, the upgrade will enable improved and precision measurements of probes such as neutral pions, direct photons, and Drell-Yan. Simultaneously, the upgrade will unlock a suite of new observables, such as charged-particle tagged jets at forward pseudorapidity. These measurements will provide new insights into the multidimensional imaging of quarks and gluons within the nucleon, nuclear parton distributions, and hadronization in a nuclear environment. As such, the STAR forward upgrade will provide information crucial to realizing the full potential of the approaching era of the electron-ion collider.

Speaker: Dr James Drachenberg (Lamar University)

Slides 293-0-Drachenberg_CIPANP_ForwardUpgrade.v2.pdf

138 EIC at Small-$x$: Connections to p+p/A & A+A Physics at RHIC & LHC

Over past years DIS $e$+$p$ data have provided crucial inputs to the phenomenology of $p$+$p$/A & A+A collisions. Largest uncertainties in such modeling arise from the spatial and momentum distribution of partons inside nuclei at small-$x$. In this talk, I will discuss such issues and highlight a few recent measurements of the charge inclusive and charge dependent angular correlations from RHIC and LHC that will help us better constrain partonic distributions inside nuclei as well as inside the hadrons. I will also discuss how the lessons from RHIC & LHC can be useful to model event-by-event physics at the EIC at small-$x$.

Speaker: Dr Prithwish Tribedy (Brookhaven National Lab)

Slides 355-0-eic_at_small_x_rhic_lhc.pdf

139 Hadron in Jet Fragmentation

Collimated jets of hadrons and their substructure play a central role at present day and future collider experiments. In particular in the past years, it has been realized that the measurement of hadron distributions inside jets can provide valuable information about QCD. On the one hand, identified hadrons can be used to precisely map out the energy distribution inside jets both in the longitudinal and transverse direction. On the other hand, new insights into the QCD hadronization mechanism can be obtained. By first reconstructing jets in the final state, these new observables capture additional information about the final state event topology compared to traditional hadron spectra. In this talk, I review the significant progress that has been made recently both from the theoretical and the experimental side.

Speaker: Felix Ringer

Slides 30-0-CIPANP18_FRinger.pdf

Physics at High Energies: Parallel 4 — Physics Beyond the Standard Model I

Conveners: Prof. Toyoko Orimoto (Northeastern University), Verena Martinez Outschoorn (UMass Amherst)

140 Search for Di-Higgs Production

Di-Higgs final states can arise through non-resonant production of two Higgs bosons and through potential heavy states decaying to two Higgs bosons. This talk presents searches in several Higgs boson decay channels using 36 fb$^{-1}$ of $pp$ collision data recorded at 13 TeV.

Speaker: Arnaud Ferrari (Uppsala University)

Slides 49-0-CIPANP-HH-AF.pdf

141 Searches for Non-Standard Model Higgs Bosons

Several theories beyond the Standard Model predict the existence of high mass neutral or charged Higgs particles. In this presentation the latest ATLAS results on searches for these particles based on 36 fb$^{-1}$ of $pp$ collision data collected at 13 TeV will be discussed.

Speaker: Mrs Ana Elena Dumitriu (IFIN,CPPM)

Slides 48-0-BSM_USA_var7.pdf

142 Highlights from SUSY Searches with the CMS Detector

With the collection of approximately 90 fb$^{-1}$ of proton-proton collision data at center-of-mass collision energy of 13 TeV since 2015, CMS is probing high mass supersymmetry (SUSY) parameter space with large datasets for the first time. The talk will first review results of the standard searches for strongly produced natural SUSY, and highlight corners of phase space where SUSY could still be hiding. Searches for lower cross section electroweak SUSY production will also be presented. The talk will conclude with a discussion of non-traditional SUSY searches including those in final states with long-lived particles and low missing transverse energy from R-parity violation.

Speaker: Dr James Hirschauer (FNAL)

Slides 328-0-hirschauer_cipanp_30may2018.pdf

143 Searches for Physics Beyond the Standard Model with Third-Generation Quarks

This talk will explore the results of current searches that utilize top and bottom quarks at ATLAS, including searches for 3rd Generation SUSY particles, searches for BSM Higgs, and searches for other exotic particles.

Speaker: Dr Siyuan Sun (University of Michigan)

Slides 303-0-CIPAN2018_3rdGen_v4.pdf

144 ATLAS Searches for Diboson Resonances

Many extensions to the Standard Model predicts new particles decaying into two bosons ($W$, $Z$, $\gamma$, $H$) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in final states with different numbers of leptons, photons and jets and $b$-jets where new jet substructure techniques to disentangle the hadronic decay products in highly boosted configuration are being used. The most recent results in the search for such resonances by the ATLAS experiment at the LHC will be presented, using proton-proton collision data collected at a centre-of-mass energy of 13 TeV.

Speaker: Ines Ochoa (Columbia University)

Slides 41-0-diboson_CIPANP2018_v2.pdf

145 Mining the LHC Data for Anomalies

We describe a novel, model-independent technique of "rectangular aggregations" for mining the LHC data for hints of new physics. A typical (CMS) search now has hundreds of signal regions, which can hide the presence of potentially interesting anomalies. Applying our technique to the two CMS jets+MET SUSY searches, we identify a set of previously overlooked $\sim3\sigma$ excesses, characterized by low jet multiplicity, zero $b$-jets, and low MET and HT. We discuss the presence of a bump in the similar ATLAS monojet search, and discuss a simplified model that provides an excellent combined fit to these excesses and discuss all additional constraints.

Speaker: Angelo Monteux (UC Irvine)

Slides 163-0-talk_CIPANP.pdf

146 Theoretical Results for Charged-Higgs Production

I discuss charged-Higgs production via two different processes: in association with a top quark, and in association with a $W$ boson. I present total cross sections and differential distributions that include higher-order corrections from soft and collinear gluon emission. I show that these radiative corrections are significant.

Speaker: Prof. Nikolaos Kidonakis (Kennesaw State University)

Slides 9-0-Kidonakis-higgs.pdf

Tests of Symmetries and the Electroweak Interaction: Parallel 4 — Beta Decays

Convener: Prof. Robert Redwine (Massachusetts Institute of Technology)

147 Measurement of the Neutron Lifetime Using a Magneto-Gravitational Trap

Precision measurements of the free neutron lifetime $\tau_n$, when combined with measurements of the axial vector coupling, can be used to test unitarity of the CKM matrix. Nonunitarity is a signal for physics Beyond the Standard Model (BSM). Sensitivity to BSM physics requires measurements of $\tau_n$ to a precision of 0.1 s. However, the two dominant techniques to measure $\tau_n$ (colloquially beam and bottle measurements) disagree by nearly 10 s. UCN$\tau$ is a neutron lifetime experiment using a magneto-gravitational trap and an $\textit{in-situ}$ neutron detector. Neutrons in this trap are not susceptible to loss on material walls as in previous bottle measurements. Additionally, the $\textit{in-situ}$ detector allows spectral monitoring of the trapped Ultracold Neutrons. In this talk, I will present our most recent result $\tau_n=877.7\pm0.7_\mathrm{(stat.)}+0.4/-0.2_\mathrm{(sys.)}$. I will also present Monte Carlo simulations of systematic effects in the experiment.

Speaker: Mr Nathan Callahan (Indiana Univeristy)

Slides 147-1-Nathan-CIPANP2018-Fixed-Typo.pdf

148 Measurement of the Electron-Antineutrino Correlation in Neutron Beta Decay: aCORN Experiment

The aCORN experiment uses a novel “wishbone asymmetry” method to measure the electron-antineutrino correlation ($a$-coefficient) in free neutron decay that does not require precision proton spectroscopy. aCORN completed two physics runs at the NIST Center for Neutron Research. The first run on the NG-6 beam line in 2013–2014 obtained the result $a =0.1090 \pm 0.0030 \mathrm{(stat)} \pm 0.0028 \mathrm{(sys)}$, a net uncertainty of 3.8%. The second run on the new NG-C high flux beam line promises an improvement in precision to $<$2%. Details of the experiment and data analysis will be presented.

Speaker: Prof. Fred Wietfeldt (Tulane University)

Slides 123-0-aCORN_few.pdf

149 New Results from the UCNA Experiment

The primary goal of the UCNA experiment is to provide, using polarized ultracold neutrons (or UCN), a high precision measurement of the axial coupling constant in neutron decay, $g_A$. High precision predictions for neutron decay in the Standard Model can be achieved with just two measurements: one to fix the absolute vector coupling strength, and one to determine $g_A$. These parameters play a critical role in a variety of physics scenarios, such as big bang nucleosynthesis, high precision models of the solar fusion rate, and high precision modeling of reactor neutrino fluxes. Neutron measurements also provide input for constraints on a variety of extensions to the Standard Model, in many cases at, or beyond, the sensitivity ultimately expected from the Large Hadron Collider. Although the vector coupling strength can be obtained from super-allowed nuclear decays, neutron decay is the definitive source for high precision values of $g_A$. UCNA is designed to determine $g_A$ through a measurement of the angular correlation between the neutron spin and the momentum of the emitted beta particle, known as the beta asymmetry. UCNA is also the first angular correlation measurement to utilize UCN to control key sources of systematic error: the neutron polarization and neutron-generated backgrounds. We present here the results of 2011–2013 running at the Los Alamos Neutron Science Center and place our results in the context of the world data set.

Speaker: Mr Eric Dees (NCSU)

Slides 208-0-2018_CIPANP_UCNA_Presentation_current.pptx

150 Beta Decay Asymmetry Measurements with Trapped Atoms

Nuclear $\beta$ decay's long history of shaping and testing the Standard Model of particle physics continues to this day with elegant, ultra-precise low-energy nuclear measurements. Experiments observing the angular correlations between the electron, neutrino and recoil momenta following beta decay can be used to search for exotic currents contributing to the dominant (V-A) structure of the weak interaction. Precision measurements of the correlation parameters to <0.1% would be sensitive to (or meaningfully constrain) new physics, complementing other searches at large-scale facilities like the LHC. Atom traps provide an ideal source of very cold, short-lived isotopes in an extremely clean and open environment. As such, they are invaluable tools for precision measurements of beta-decay parameters. The TRIUMF Neutral Atom Trap (TRINAT) collaboration utilizes neutral atom-trapping techniques with optical pumping methods to highly polarize (>99%) $^{37}$K atoms. Recently, we determined the beta asymmetry parameter to 0.3%, which is comparable to or better than any other nuclear measurement, including the neutron. In terms of minimal left-right symmetric models, this implies a limit of >351 GeV for the mass of a possible right-handed $W$. Alternatively, one may interpret the result as a 4.4$\times$ better measurement of $V_{ud}$ from $^{37}$K. This talk will discuss using atom traps as a test of the electroweak interaction with particular emphasis on TRINAT's $^{37}$K program.

Speaker: Prof. Dan Melconian (Texas A&M University)

Slides 70-0-melconian-CIPANP2018.pdf

151 Nuclear Beta Decays and CKM Unitarity

Results from superallowed $\beta$ decays between $0^+$, $T=1$ analog states yield the best value for $V_{ud}$, with a precision of $\pm$0.02%. World data now comprise 14 separate superallowed transitions having $\mathcal{F}t$ values known to 0.1% precision or better. These results, which cover a wide range of parent nuclei from $^{10}$C to $^{74}$Rb, constitute a very robust data set. Each transition's $\mathcal{F}t$ value depends on its half-life, $Q$-value and branching ratio. It also depends on small ($\sim$1%) transition-dependent theoretical corrections, of which the most sensitive accounts for isospin symmetry breaking. The validity of these corrections is confirmed by the excellent consistency among the 14 $\mathcal{F}t$-values, an expected consequence of CVC. Recent measurements, which compare pairs of mirror superallowed transitions, further support that validity. With CVC consistency established, the result now yields $V_{ud} = 0.97420(21)$, which makes this by far the most precisely known element of the CKM matrix. Together with $V_{us}$ and $V_{ub}$, it leads to the most demanding test available of the unitarity of that matrix, with the sum of squares equaling 0.99962(49). Three other types of beta decay can be used to extract $V_{ud}$: the superallowed beta decay between $T=\frac{1}{2}$ mirror nuclei; and the beta decays of the neutron and pion. All three are hampered by experimental challenges that have limited their $V_{ud}$ precision well short of that achieved with the superallowed $0^+$$\to 0^+$ transitions. They are, however, statistically consistent with it.

Speaker: Prof. John C. Hardy (Texas A&amp;M University)

Slides 66-0-Hardy_CIPANP2018_talk.pdf

152 Recent Status of Weak-Interaction Tests via Precision Superallowed Beta-Decay Measurements at TRIUMF

Tests of the Standard Model through precision measurements of nuclear decay properties have proven to be a valuable tool in experimental subatomic physics. Of these investigations, $0^+ \to 0^+$ $\beta$-decay decay data are among the most important, as they currently provide the most precise determinations of both the vector coupling strength in the weak interaction, $G_V$, and the up-down element of the CKM quark mixing matrix, $V_{ud}$. These studies also provide some of the best constraints on the possibility of additional quark generations, as well as limits on exotic currents in the weak interaction. The three quantities that are required for performing these tests (branching ratio, half-life, and Q-value) can all be measured to high-precision with rare-isotope beams at the TRIUMF-ISAC facility in Vancouver, Canada. In this talk, I will highlight recent experimental work with both the GRIFFIN spectrometer and the TITAN ion-trap system, as well as theoretical advances towards first-principle nuclear-structure corrections. Finally I will provide a picture of where the remaining critical measurements still reside, and where work at TRIUMF is headed in the near future.

Speaker: Prof. Kyle Leach (Colorado School of Mines)

Slides 13-0-20180630_CIPANP_Superallowed.pptx

153 New Evaluation of the $\gamma W$-box Correction to $0^+-0^+$ Nuclear $\beta$-Decay and $V_{ud}$ Extraction

Current most precise knowledge of the value of $V_{ud}$ is obtained from the analysis of a number of superallowed nuclear $\beta$-decays. At present, the main limitation in precision of this determination is due to radiative corrections, more specifically the "inner" $\gamma W$-box correction that is independent of the electron spectrum but depends on hadronic structure. A novel dispersion formulation of the $\gamma W$-box is developed. It allows to test the validity and improve the previous evaluation of Marciano and Sirlin, which was based on several semi-empiric assumptions. Further effects, such as possible effects of the nuclear excitations both on inner and outer corrections are discussed.

Speaker: Dr Mikhail Gorshteyn (Mainz University)

Slides 3-0-Gorshteyn_gamma-W_CIPANP2018.pdf

Thursday, 31 May

Registration Desk: Open 07:30 – 17:30

Plenary 5: Quark Matter and High Energy Heavy Ion Collisions | Special Topic

Convener: David Hertzog

154 Recent Results on Heavy Flavor Production in High Energy Nuclear Collisions

The goal of the ultra-relativistic heavy ion program is to study Quantum Chromodynamics under finite temperature and density conditions. After a couple of decades of experiment, the focus at the top RHIC and the LHC energy has evolved to quantitative understanding of properties of the hot and dense medium, namely the strongly-coupled Quark Gluon Plasma (sQGP) created in these heavy-ion collisions, and to constrain transport parameters of the sQGP medium. Heavy quarks offer unique insights towards detailed understanding of the sQGP properties due to their large masses. Recent collider and detector advances have enabled precision measurements of heavy quark hadron production in heavy-ion collisions. In this talk, I will review recent results from heavy quark production measurements at RHIC and the LHC. These high quality data will offer stringent constraints on theoretical model calculations and help precision determination of QGP medium transport parameters. Finally, I look forward to a more prospective future of the heavy quark program with further improved detectors at both RHIC and the LHC.

Speaker: Xin Dong

Slides 207-0-CIPANP2018_05302018.pdf

155 Status of Searches for Chiral Magnetic Effects in Nuclear Collisions

The Chiral Magnetic Effect (CME) is the phenomenon of electric charge separation along the external magnetic field that is induced by the chirality imbalance. In relativistic nucleus-nucleus collisions, local chirality imbalance of left- and right-handed quarks may be generated, which is related to the topology of gluon gauge fields. With the presence of an extremely strong magnetic field, the CME has been predicted to occur, leading to final-state electric charge separations along the poles of the lenticular-shaped medium created. In this talk, I will review the latest status of experimental searches for the chiral magnetic effects in nuclear collisions at RHIC and the LHC, and discuss exciting opportunities with programs planned in the near future.

Speaker: Prof. Wei Li (Rice University)

Slides 75-0-CIPANP-weili-05302018v3.pdf

156 Physics with an Electron-Ion Collider

An Electron-Ion Collider, proposed in the U.S. as facility upgrades to Jefferson Lab or the Relativistic Heavy Ion Collider, would offer unique capabilities to study quarks and gluons in nucleons and nuclei using flexible collision energies, high luminosity, and high polarization. It would make it possible to image quarks and gluons in nucleons and nuclei, to characterize their QCD dynamics, and to explore phenomena at high gluon density. This talk will highlight the science, key measurements, and prospects for realization.

Speaker: Ernst Sichtermann

Slides 302-0-CIPANP-Sichtermann.pdf

09:45 Break

Plenary 6: Dark Matter | Particle and Nuclear Astrophysics

Convener: Prof. Karl van Bibber (University of California Berkeley)

157 Recent Results from Dark Matter Direct Detection Experiments

The worldwide effort of direct dark matter detection has made tremendous progress towards the understanding of dark matter. New results were reported recently from several experiments using techniques across from noble liquids, bubble chambers, cryogenic bolometers, scintillating crystals and low-threshold detectors, covering a large dark matter mass range and constraining new parameter space for the dark matter interaction cross sections. Are we at the brink of a discovery, or will we soon encounter the unavoidable neutrino background? I will review the recent results with a prospect towards the future.

Speaker: Prof. Kaixuan Ni (UC San Diego)

Slides 89-0-DMResults_CINAP18.pdf

158 New Directions in the Search for Light and Ultralight Dark Matter

Dark matter candidates span the entire mass range from $\sim10^{-22}$ eV up to the weak scale and beyond. Recently, the scope of dark matter searches has significantly expanded to include a variety of motivated candidates over much of this mass range. I will discuss new ideas and prospects to directly detect "light" (sub-GeV) and "ultralight'' (sub-eV) dark matter, generalizing searches for WIMPs or axion dark matter. I will highlight several examples covering the meV–GeV mass range, including prospects for absorption of bosonic dark matter as well as proposals to detect scattering of sub-MeV dark matter.

Speaker: Tongyan Lin (UCSD)

Slides 104-0-05_31_2018_CIPANP.pdf

159 Coherent Scattering and the Flavor Physics and Detection of Supernova Neutrinos

Coherent elastic neutrino-nucleus scattering (CE$\nu$NS) is a neutral-current process in which a neutrino scatters off an entire nucleus, depositing a tiny recoil energy. The process is important in core-collapse supernovae and also presents an opportunity for detection of a burst of core-collapse supernova neutrinos in low-threshold detectors designed for dark matter detection. This talk will discuss the physics of CE$\nu$NS, its importance in core collapse, and prospects for supernova burst detection in low-threshold recoil detectors.

Speaker: Prof. Kate Scholberg (Duke University)

Slides 83-0-cipanp18.pdf

160 IceCube: Opening a New Window on the Universe from the South Pole

The IceCube project has transformed a cubic kilometer of natural Antarctic ice into a neutrino detector. The instrument detects more than 100,000 neutrinos per year in the GeV to PeV energy range. Among those, we have isolated a flux of high-energy cosmic neutrinos. I will discuss the instrument, the analysis of the data, the significance of the discovery of cosmic neutrinos, and the recent multimessenger observation of a flaring TeV blazar in coincidence with the IceCube neutrino alert IC170922. The large cosmic neutrino flux observed implies that the Universe’s energy density in high-energy neutrinos is the same as that in gamma rays, suggesting that the sources are connected and that a multitude of astronomical objects await discovery.

Speaker: Prof. Francis Halzen (WIPAC, UW-Madison)

Slides 31-0-CIPANP_Halzen.pdf

12:30 Lunch

Dark Matter: Parallel 5 — Light Mass Dark Matter

Conveners: Prof. George Fuller (University of California, San Diego), Prof. Matt Pyle (University of California Berkeley)

161 Supernova 1987A Constraints on Sub-GeV Particles

Supernova 1987A created an environment of extremely high temperatures and nucleon densities. The rough agreement between predictions of core collapse models and observations of a "neutrino burst" provide an opportunity to set bounds on a wide range of theories of new physics. I will present new bounds on dark sector models, incorporating finite-temperature effects on the production and trapping of a dark photon and millicharged particles, nuclear effects for the coupling to axions, and a more realistic model of the high-mixing parameter space than in previous work. This has dramatic effects for the landscape of such models.

Speaker: Dr Samuel McDermott (FNAL)

Slides 358-0-mcd-sn-light-particles.pdf

162 Initial Dark Matter Results from the SuperCDMS Single-Charge Sensitive Detectors

Astronomical evidence over the past several decades points to a Universe composed primarily of Dark Matter. There are several competing hypotheses about the composition and the interaction mechanisms of Dark Matter. Several groups have assembled instruments to test these ideas by searching for the hypothesized interaction, but despite their best efforts no direct detection has been confirmed to date. The Super Cryogenic Dark Matter Search (SuperCDMS) SNOLAB experiment is the successor to SuperCDMS Soudan and CDMS II experiments, which for the past two decades focused on the direct detection of dark matter particles. Currently, the next generation of high-resolution SuperCDMS HV detectors are being developed and recently a 0.93 g prototype with a charge resolution of 0.1 electron-hole pairs (CDMS HVeV) was produced. A 0.49-gram day exposure with minimal overburden was taken using the CDMS HVeV detector. The first limits on inelastic electron scattering dark matter and dark photon absorption are presented. The limits for the dark matter-standard model particle interaction significantly improve experimental constraints on dark matter particles with masses as low as 1 MeV. These results demonstrate the scientific potential of phonon-mediated semiconductor detectors that are sensitive to single electronic excitations.

Speaker: Dr Francisco Ponce (Stanford University)

Slides 262-0-CIPANP_2018.pdf

163 Status and Prospects of CDEX-10

There is compelling evidence that about one-quarter of the energy density of the Universe is made up of Dark Matter, the identification and study of which are among the most important goals in basic research. The China Dark Matter Experiment (CDEX) pursues direct searches of light Weakly Interacting Massive Particles (WIMPs) at the China Jinping Underground Laboratory (CJPL), which is the deepest operating laboratory for astroparticle research in the world. Recent results from a prototype CDEX-1 pPCGe (p-type Point Contact Germanium) detector and CDEX-10 array detector system are reported. The CDEX-10 experiment with a PCGe array of 10 kg target mass range is still taking data. The CDEX program evolves into the targets of "CDEX-1T Experiment" with ton-scale germanium detector arrays, which will be composed of thousands of kg-mass prototype germanium detectors and further contribute to the studies of Dark Matter search and Neutrinoless Double Beta Decay. The key technologies including HPGe detector fabrication, crystal growth and so on has been pursued. A new large space in CJPL-II will be ready by the end of 2018 for CDEX experiment.

Speaker: Dr qian Yue (Tsinghua University)

Slides 64-0-QianYue-CDEX-10.pdf

164 SENSEI Experiment for Direct Search of Light Dark Matter

We present the status and prospects of the Sub-Electron Noise Skipper Experimental Instrument (SENSEI) that uses a non-destructive readout technique to achieve stable readout for thick fully depleted silicon CCD in the far sub-electron regime ($\sim 0.05\ e^-$ rms/pix). This is the first instrument to achieve discrete sub-electron counting that is stable over millions of pixels on a large-area detector. This low threshold allows for unprecedented sensitivity to the largely unexplored, but theoretically well-motivated, area of sub-GeV dark matter models. We’ll discuss the reach and prospects of the SENSEI experiment currently under construction, which will use 100 grams of Skipper CCDs. We will also present the lessons learned from a small scale prototype currently operating in the MINOS cavern at Fermilab.

Speaker: Dr Guillermo Fernandez Moroni (Fermilab)

Slides 371-0-CIPANP_SENSEI.pdf

165 keV Sterile Neutrinos as Dark Matter and the 3.5 keV Line

I will give an overview of the status of keV sterile neutrinos as dark matter, including the production mechanisms in the early universe and detectability today. I will give the status of indirect searches, including the candidate X-ray line at 3.55 keV and prospects for future searches. I will also discuss laboratory detection methods, including searches in beta decay and K-capture nuclei.

Speaker: Kev Abazajian (UC Irvine)

Slides 300-0-Abazajian_CIPANP_DM_2018.pdf

Neutrino Masses and Neutrino Mixing: Parallel 5 — Double Beta Decay with Final-State Detection | Low-Energy Neutrino Scattering

Conveners: Prof. Andre de Gouvea (Northwestern University), Daniel Dwyer

166 Status of the nEXO Experiment

The planned next generation Enriched Xenon Observatory (nEXO) experiment is aiming to search for the neutrino-less double beta ($0\nu\beta\beta$) decay from $^{136}$Xe. nEXO has a sensitivity in the order of $10^{28}$ years on the half-life (T$_{1/2}$) of $0\nu\beta\beta$ decay from $^{136}$Xe after 10 years’ running, entirely covering the inverted mass hierarchy region. The nEXO detector is a time projection chamber (TPC). It has a cylindrical shape with a diameter of $\sim$1.3 m and a drift length of $\sim$1.2 m containing 5 tonnes of liquid xenon enriched to 90% ($^{136}$Xe). nEXO will use modular metal pads deposited on a quartz substrate to readout the ionisation signal and provide the spatial information of the event. nEXO will be implemented with $\sim$4 m$^2$ silicon photomultiplier (SiPM) to collect the scintillation light in addition to the charge signal. Combining both charge and light signals, nEXO aims to have an energy resolution of 1% at the Q-value of the double beta decay from $^{136}$Xe. In this talk, both the physics potential of nEXO and various R&D outcomes will be presented.

Speaker: Shuoxing Wu (Stanford University)

Slides 236-0-nEXO_SWu_CIPANP.pdf

167 Demonstration of Single Barium Ion Sensitivity for Neutrinoless Double Beta Decay Using Single Molecule Fluorescent Imaging

A new method to tag the barium daughter in the double beta decay of $^{136}$Xe is described, based on adaptation of the single molecule fluorescent imaging (SMFI) technique. Individual barium dications chelated on a transparent plate are detected at a significance of 12.9 $\sigma$, with a spatial resolution of 2 nm rms. Observation of a single-step photo-bleach transition confirms the interpretation of single ion sensitivity. This result is the first step toward an essentially background-free technique in the search for neutrino-less double beta decay in $^{136}$Xe, based on robust event discrimination by SMFI in a high-pressure xenon gas TPC.

Speakers: Prof. David Nygren (University of Texas at Arlington), Dr David Nygren (Lawrence Berkeley National Laboratory)

168 Overview of Decay-At-Rest Neutrino Sources

Recently, the idea of Decay-At-Rest (DAR) neutrino sources has gained in popularity due to their well understood energy spectrum and flavor composition. Currently, there are experiments being proposed which use decay-at-rest from kaons, pions, muons, and isotopes. I will present an overview of the decay-at-rest process, and the experiments being developed. After looking at the bigger picture, I will focus on particle accelerator driven decay-at-rest and the technology necessary to achieve the experimental goals (e.g. discovering sterile neutrinos).

Speaker: Dr Daniel Winklehner (MIT)

Slides 6-0-CIPANP2018_Winklehner.pdf

169 CEvNS Observation at the SNS with the COHERENT Experiment

The process of coherent elastic neutrino-nucleus scattering (CEvNS) predicted more than 40 years ago eluded detection for a long time despite having the largest cross-section for low-energy neutrino interactions. This is largely because CEvNS detection requires sensitivity to low-energy nuclear recoils in a potentially high-background environment. The COHERENT collaboration is deploying a suite of low-energy detectors in a low-background corridor of the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory (ORNL) to test the $N^2$-dependence of CE$\nu$NS with different nuclear targets and detector technologies. The first observation of CEvNS at a 6.7$\sigma$ confidence level was recently made by the COHERENT experiment with a 14.6 kg CsI[Na] detector. The result is in agreement with the Standard Model prediction and already improves constraints on non-standard neutrino interactions. In addition, COHERENT has a 185 kg NaI[Tl] scintillating crystal array and an about 22 kg LAr detector to provide results on CEvNS from a light nucleus where nuclear form factors are close to unity. Planning is ongoing for a 10 kg PPC HPGe to be deployed in the near future. The recent observation of CEvNS at SNS, an overview of the COHERENT experiment, and a survey of the future experimental program will be presented.

Speaker: Dr Ivan Tolstukhin (Department of Physics, Indiana University, Bloomington, IN, 47405, USA)

Slides 264-0-cipanp2018_Tolstukhin_COHERENT_05312018.pdf

170 Recent MiniBooNE Results: First Measurement of Monoenergetic Muon Neutrino Charged Current Interactions and a Search for Vector Portal Dark Matter

This talk will present recent results from MiniBooNE, with a focus on the first measurement of monoenergetic muon neutrino charged current interactions. MiniBooNE's sensitive search for vector portal dark matter in the mass range 0.01–0.3 GeV will also be discussed. The NuMI beam absorber provides an intense source of 236 MeV muon neutrino events originating from kaon decay at rest that are observed by the MiniBooNE detector. The kaon-decay-at-rest (KDAR) neutrino represents a standard candle for studying neutrino-nucleus interactions, cross sections, and energy reconstruction in the hundreds of MeV region and can be used for a number of precision measurements. This result is the first known-energy, weak-interaction-only probe of the nucleus to yield a measurement of neutrino-nucleus energy transfer ($\omega = E_\nu −E_\mu$).

Speaker: Rory Fitzpatrick (University of Michigan)

Slides 146-0-fitzpatrickKDARCIPANP2018_v5.pdf

Nuclear Forces and Structure, NN Correlations, and Medium Effects: Parallel 5 — Short-Range Correlations

Convener: Prof. Gerald Miller (University of Washington)

171 New Studies of the EMC Effect and Short-Range Correlations

I will present results from new studies of short-ranged correlations in nuclei and the EMC effect, with emphasis on measurements of neutron-rich nuclei. I will also discuss the development of new effective theories for describing short-ranged correlations, the way in which they relate to experimental observables, and the emerging universality of short-distance and high-momentum physics in nuclear systems.

Speaker: Prof. Or Hen (MIT)

172 Isospin Dependence of the EMC Effect and Nucleon Short-Range Correlations

The number of Short-Range Correlated (SRC) pairs in nuclei is known to linearly correlate with the strength of the European Muon Collaboration (EMC) effect. This linear correlation has lead to theoretical models of the EMC effect where primarily nucleons which are members of SRC pairs are modified. As recent work has shown, the overwhelming majority of these SRC pairs are neutron-proton (np) pairs. A consequence of np pair dominance is an isospin dependence to the EMC effect. By constructing per-neutron and per-proton SRC and EMC cross-section ratios, we show that a larger fraction of protons than of neutrons are modified in asymmetric, neutron-rich nuclei. With these new normalizations, we find that the per-neutron EMC slopes and SRC ratios both saturate much sooner than the standard per-nucleon quantities, starting already with carbon; while the per-proton values continue to increase, even going from iron to lead. In addition, we extract a universal EMC modification function based on the assumption of np pair dominance.

Speaker: Barak Schmookler (Massachusetts Institute of Technology)

Slides 213-0-CIPANP_2018.pdf

173 Short-Range Correlations

Due to the highly localized feature of the short-range correlations (SRCs), the high momentum tails from light to heavy nuclei reveals very similar distributions when their momenta are above the Fermi momentum. The exclusive measurements of proton and electron scattering off the NN pairs in 2N-SRC showed the dominance of $np$ pairs. It indicates the isospin nature of the NN interaction at short distance. With the measurements of inclusive electron scattering on different nuclei in the quasi-elastic region, we are able to study the two- and three- nucleon correlations (2N-SRC and 3N-SRC), by taking the cross-section ratios of heavy nuclei to light nuclei, such as Deuteron or He$_3$. While the 2N-SRC has been observed with good agreement at SLAC in 1980s, and recently in Hall-B and Hall-C at Jefferson Lab, however, there is still no clear evidence of the 3N-SRC because both results show no agreement. The most recent experiment in Hall-A, E08014, performed a more precious measurement on the 3N-SRC as well as the isospin dependence of SRCs. The new results revealed no clear signal of 3N-SRC plateau at the $x>2$ region. The next generation experiments using H$_3$/He$_3$ targets, which have been taking data in 2018, will further investigate the SRC effects both in exclusive and inclusive scattering. In this talk, I will briefly introduce the SRCs, results from previous measurements and most recent experiments, and introduce the ongoing experiments, followed by some discussions.

Speaker: Dr Zhihong Ye (Argonne National Lab)

174 New Results on Three-Nucleon Short Range Correlations

Three nucleon short range correlations are one of the most elusive structures in nuclei, whose observation and the evaluation of their properties may have a significant impact on our understanding of the dynamics of super-dense nuclear matter that may exist in the cores of Neutron Stars. We discuss kinematic conditions and the observables that are most optimal for probing 3N SRCs in inclusive electro-nuclear processes and make predictions about the inherent relation between 2N and 3N SRCs. We demonstrate that these predictions are in reasonable agreement with the limited number of available high energy data, indicating on the possible first observation of 3N SRCs in the nuclei.

Speaker: Misak Sargsian (Florida International University)

Slides 182-0-sargsiancipnap18.pdf

Parton and Gluon Distributions in Nucleons and Nuclei: Parallel 5 — Parton Helicities and the Spin Sum Rule

Convener: Dr Ralf Seidl (RIKEN)

175 Glue Spin from Lattice QCD

The formulation of the glue spin operator and large momentum effective theory will be reviewed and a direct calculation of the glue spin from the lattice calculation with chiral fermion action will be presented. The lattice calculation is carried out with overlap fermion on 2+1 flavor domain wall fermion configurations. Both the overlap and domain wall fermions are chiral fermions. A global fit with large momentum extrapolation on multiple lattices with 4 lattice spacings and one at physical pion mass to assess the systematic errors has been undertaken to reach the final result.

Speaker: Prof. Keh-Fei Liu (University of Kentucky)

Slides 214-0-Glue_Spin_CIPNAP.pdf

176 Overview of Longitudinal Spin Physics Results from RHIC

The Relativistic Heavy Ion Collier (RHIC) at Brookhaven National Laboratory has been in operation since 2001 and delivered the world’s highest energy polarized proton-proton collisions with the center of mass energy up to 510 GeV. This has provided a unique opportunity to study the polarized quark and gluon spin structures inside the proton and novel QCD dynamics in longitudinally and transversely polarized proton-proton collisions at high energy. In this talk, I will highlight the latest longitudinal spin physics results from the PHENIX and STAR experiments at RHIC, including studies of the gluon and flavor identified quark polarizations inside the proton, followed by a brief discussion of the future prospects of spin physics opportunity at RHIC.

Speaker: Dr Ming Liu (Los Alamos National Laboratory)

Slides 59-0-CIPANP-2018-RHIC-Longitudial-Spin-Overview-Liu-v2.pdf

177 Nucleon Spin Structure Measurements at JLab

We will summarize the longitudinal and transverse spin measurements at JLAB. First, we will present the published and preliminary experimental results. They belong to a first phase of research using JLab's 6 GeV beam that covered the interface between the perturbative and nonperturbative domains of QCD. Furthermore, we have results pertaining to these two domains, e.g. high-$x$ DIS on one side of the interface and the chiral domain on the other side. We will then discuss the impact of these measurements, showing in particular how they trigger theoretical advances for AdS/QCD, hadron spectroscopy and GPDs. We conclude by discussing the future spin program with the JLab upgraded 12 GeV beam.

Speaker: Alexandre Deur (Jefferson Lab)

Slides 11-0-Deur_CIPANP18.pdf

178 Hadron Multiplicity and Fragmentation in SIDIS

COMPASS final results on multiplicities of charged hadrons and of identified pions and kaons produced in the deep inelastic muon scattering off an isoscalar target are presented and compared to HERMES results. Measurements are done in bins of $x$, $y$ and $z$ in a wide kinematic range. The hadron and pion data show a good agreement with (N)LO QCD expectations. The most interesting is the kaon multiplicity that allows to extract kaon fragmentation functions, a crucial ingredient in solving the strange quark polarisation puzzle. The COMPASS results are quite different from the expectations of the old NLO DSS fit and they cannot be described by LO QCD either. In this context the importance of $K^+/K^-$ multiplicity ratio at high $z$ is discussed.

Speaker: Mr Nicolas PIERRE (CEA Saclay)

Slides 24-0-PIERRE_CIPANP18.pdf

Physics at High Energies: Parallel 5 — Physics Beyond the Standard Model II

Convener: Prof. Stefania Gori (University of Cincinnati)

179 Searches for New Phenomena in Leptonic Final States Using the ATLAS Detector

Many theories beyond the Standard Model predict new phenomena which decay to well isolated, high-$p_t$ leptons. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the $pp$ collision data sample collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.

Speaker: Mr Sebastien Rettie (The University of British Columbia)

Slides 42-0-2018_05_31_Sebastien_Rettie_CIPANP_2018_v5.pdf

180 Searches for BSM Physics with the CMS Detector

Discovery of the Higgs boson at the Large Hadron Collider completed the Standard Model puzzle. However, we still do not know why the Higgs boson is light, what is the makeup of the dark matter, how matter survived in the evolution of the universe, etc. LHC's treasure-trove of proton-proton collision data could allow us to better understand the mysteries of the nascent universe and the Higgs mass. The CMS Collaboration has a broad program of searches which target heavy resonances, long-lived particles and other objects predicted by various theoretical models. I will describe how the CMS experimentalists are sorting through the LHC collision data to go Beyond the Standard Model. The focus of the talk will be on recent results obtained using data collected at Run-II of the LHC.

Speaker: Prof. Sunil Somalwar (Rutgers University/Dept of Physics)

Slides 336-0-1805-CIPANP-Somalwar.pdf 336-1-1805-CIPANP-Somalwar.pptx

181 EFT for Higgs Physics

The ATLAS and CMS collaborations have recently released significant new data on Higgs and diboson production in LHC Run 2. Measurements of Higgs properties have improved in many channels, while kinematic information for $h\to\gamma\gamma$ and $h\to ZZ$ can now be more accurately incorporated in fits using the STXS method, and $W^+W^−$ diboson production at high $p_{_\mathrm{T}}$ gives new sensitivity to deviations from the Standard Model. We have performed an updated global fit to precision electroweak data, $W^+W^−$ measurements at LEP, and Higgs and diboson data from Runs 1 and 2 of the LHC in the framework of the Standard Model Effective Field Theory (SMEFT), allowing all coefficients to vary across the combined dataset, and present the results in both the Warsaw and SILH operator bases. We exhibit the improvement in the constraints on operator coefficients provided by the LHC Run 2 data, and discuss the correlations between them. We also explore the constraints our fit results impose on several models of physics beyond the Standard Model.

Speaker: Chris Murphy (Brookhaven)

Slides 138-0-cwmEFTforHiggsPhysics.pdf

182 Probing Hidden Sectors at the LHC

I discuss examples of how the LHC can be sensitive to low-mass hidden sectors. In particular, I show how rare $Z$-boson decays provide a window into the mass-generation mechanism of dark-photon models, motivating searches for displaced vertices and high multiplicities of soft leptons.

Speaker: Brian Shuve (Harvey Mudd College)

Slides 309-0-Shuve_CIPANP_HE.pdf

QCD, Hadron Spectroscopy, and Exotics: Parallel 5 — γ–γ | Form Factors at High q²

Convener: Dr Seamus Riordan (Argonne National Laboratory)

183 Two-Photon Effects in Elastic Nucleon Form Factors

In view of the proton radius puzzle and the precision currently achieved in extracting the proton radius from muonic Hydrogen spectroscopy, the two-photon exchange (TPE) corrections between the lepton and hadron are at present the largest source of hadronic uncertainty. I present an overview on recent work within a dispersion relation framework to estimate such TPE corrections both in elastic electron-proton and muon-proton scattering as well as in the interpretation of the muonic Hydrogen spectroscopy. The results are compared to recent CLAS, VEPP-3 and OLYMPUS data as well as to a full TPE calculation in the near-forward approximation, based on unpolarized structure function input. The next steps in this field will be discussed.

Speaker: Prof. Marc Vanderhaeghen (University Mainz)

Slides 292-1-twophoton_vanderhaeghen_CIPANP2018.pdf

184 High $Q^2$ Elastic Form Factor Program at Jefferson Lab

The electromagnetic form factors (EMFFs) of the nucleon, measured in elastic electron-nucleon scattering, are among the simplest and most well-defined measurable dynamical properties of the nucleon, and serve as important benchmarks for the testing of theoretical models and $\textit{ab initio}$ lattice QCD calculations of nucleon structure. They also provide stringent, model-independent constraints on the extraction of Generalized Parton Distributions (GPDs), particularly at large values of the momentum transfer $Q^2$. Precise knowledge of the EMFFs over a wide $Q^2$ range is also essential to the interpretation of many other experiments in nuclear and particle physics. In the last two decades, the use of polarization observables has dramatically increased our knowledge of the nucleon EMFFs at large $Q^2$ values. Such measurements are presently a unique worldwide capability of Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF). In this talk, I will present the near-future program of high-$Q^2$ nucleon EMFF measurements at CEBAF, exploiting the recently-completed upgrade of CEBAF to a maximum beam energy of 11 GeV (for electron-beam experiments), and the complementary capabilities of experimental Halls A, B, and C. Central to this program is the new Super BigBite Spectrometer (SBS), which is specifically designed to enable the high-$Q^2$ EMFF program. Time permitting, I will also discuss prospects for higher-$Q^2$ EMFF measurements at a future polarized electron-ion collider (EIC).

Speaker: Prof. Andrew Puckett (University of Connecticut)

Slides Link to PowerPoint with GIF animation on slide 6

185 Proton Polarizabilities from a Partial-Wave Analysis of Compton Scattering Data / Sum Rules Connecting Real and Virtual Compton Scattering on the Nucleon

Talk 169: I would like to present a first partial wave-analysis (PWA) of the experimental cross sections of Compton scattering on the proton [1]. The resulting solutions reveal an appreciable sensitivity to small refinements of the experimental database, which could explain the discrepancies among the various extractions of proton polarizabilities (see e.g. [3] for review). The database inconsistency can soon be resolved by the ongoing Compton experiments at the Mainz Microtron (MAMI). [1] N. Krupina, V. Lensky and V. Pascalutsa, arXiv:1712.05349 [nucl-th]. [2] O. Gryniuk, F. Hagelstein and V. Pascalutsa, Phys. Rev. D92 (2015) 074031; ibid. D94 (2016) 034043. [3] F. Hagelstein, R. Miskimen and V. Pascalutsa, Prog. Part. Nucl. Phys. 88 (2016) 29-97. Talk 4: The response of a nucleon to external electromagnetic probes at low energies and low momenta is encoded in structure constants, the *nucleon polarizabilities*. In this presentation, I will discuss new relations (sum rules) that connect the structure constants measured in real, virtual, and doubly-virtual Compton scattering (CS). These relations are obtained, assuming the analyticity of the CS amplitude. Two of the new sum rules connect structure constants dependent on the nucleon spin, e.g., the longitudinal-transverse polarizability $\delta_{LT}$, accessed in inclusive electron scattering, is related to the static spin polarizability $\gamma_{E1E1}$, measured in the real CS, and the slope of spin generalized polarizabilities (GPs) $P^{(M1,M1)1}-P^{(L1,L1)1}$, measured in the virtual CS. The other two sum rules hold for the unpolarized doubly-virtual CS and relate some structure constants that can only be measured in off-forward doubly-virtual CS (not experimentally accessible at present) to the slopes of the nucleon's scalar GPs and moments of the unpolarized structure functions $F_1(x,Q^2)$ and $F_2(x,Q^2)$. One more relation constrains the low-$Q^2$ behaviour of the subtraction function in the CS amplitude, which enters the two-photon-exchange contribution to the Lamb shift of (muonic) hydrogen. I will discuss the verification of these sum rules, using empirical data and $\chi$PT, and the use of these relations to constrain the low-energy structure of the nucleon.

Speaker: Dr Vladimir Pascalutsa (University of Mainz)

Slides 169-0-~1.PDF

Quark Matter and High Energy Heavy Ion Collisions: Parallel 5 — Small Systems and the Limits of the Quark Gluon Plasma

Conveners: Prof. Jacquelyn Noronha-Hostler (Rutgers University), Marta Verweij (Vanderbilt University)

186 Influence of the QCD Equation of State by System Size

A long standing question in the field of heavy-ion collisions is whether charm quarks are thermalized within the Quark Gluon Plasma. In recent years, progress in lattice QCD simulations has led to reliable results for the equation of state of a system of 2+1 flavors (up, down, and strange) and 2+1+1 flavors (up, down, strange, and charm). We find that the equation of state strongly affects differential flow harmonics and a preference is seen for thermalized charm quarks at the LHC. Predictions are also made for the event-plane correlations at RHIC Au–Au $\sqrt{s_{NN}}=200$ GeV collisions, and the scaling of differential flow observables and factorization breaking for all charged particles at LHC Pb–Pb $\sqrt{s_{NN}}=5.02$ TeV collisions compared to LHC Xe–Xe $\sqrt{s_{NN}}=5.44$ TeV collisions, which could be useful in answering the question: are charm quarks thermalized?

Speaker: Prof. Jacquelyn Noronha-Hostler (Rutgers University)

Slides 313-0-CIPANP18.pdf

187 CMS Results on Small Systems

In recent years, a wealth of experimental evidence has suggested the presence of novel collectivity in small collision systems such as $p$–$p$ and $p$–Pb with high-multiplicity final states. The origin of the observed collectivity is under intense debate, i.e., whether a strongly coupled quark-gluon medium is formed, similar to that in large heavy ion collisions. Latest results at CMS in small systems will be presented. These results will provide new insights in unraveling the nature of collectivity in small but dense QCD systems.

Speaker: Zhenyu Chen (Rice University)

Slides 315-0-CIPANP2018_Zhenyu_v2.pdf

188 PHENIX Results on Collectivity in Small Systems

To answer the question of how small a system can be while still exhibiting collective behavior, the PHENIX experiment has used RHIC's extraordinary versatility to design a set of experiments controlling the initial geometry of the collisions by selecting different colliding species, $p/d/^3$He+Au. In addition, a beam energy scan with $d$+Au collisions was done to vary the lifetime of the system while keeping the initial geometry constant. In this talk we show PHENIX measurements of elliptic and triangular flow of charged hadrons and elliptic flow of identified hadrons at midrapidity as a function of transverse momentum in $p/d/^3$He+Au collisions at 200 GeV per nucleon center-of-mass energy. Measurements of elliptic flow of charged hadrons in $d$+Au collisions at 200, 62.4, 39, and 19.6 GeV per nucleon center-of-mass energy will also be presented as a function of transverse momentum and pseudorapidity. In order to assess the origin of collectivity in the smallest systems, these results are compared with several theoretical models that produce azimuthal particle correlations based on initial and/or final state effects. Hydrodynamical models which include a droplet of quark gluon plasma provide the best simultaneous description of our observations.

Speaker: Sylvia Morrow (Vanderbilt University)

Slides 330-0-Morrow-PHENIX-SmallSystems-CIPANP18-may31.pdf

189 Signatures of Hydrodynamic Behavior in Small Collision Systems

A well-established hydrodynamic framework has been developed over the last couple of decades to describe the dynamics of the fluidlike system (potentially, a quark-gluon plasma) created in relativistic heavy-ion collisions. This framework predicts in particular the nontrivial patterns of long-range azimuthal correlations which are observed in the final states of nucleus-nucleus collisions, and has been able to explain, essentially, all data on azimuthal correlations collected at the BNL Relativistic Heavy Ion Collider (RHIC) and at the CERN Large Hadron Collider (LHC). A striking result of the LHC is the observation of the same patterns of azimuthal correlations in the final states of smaller collision systems, namely, $p$+$p$ and $p$+Pb collisions. Such observations triggered immediately the question of whether a tiny droplet of fluidlike matter may be created in these small systems. Nowadays this is a subject under intense study, both theoretically and in experiments. In this talk, I present our understanding of small systems in the hydrodynamic framework. By means of very simple arguments, I explain how the paradigms of the hydro picture turn out to be powerful tools allowing for predictions which are robust and universal, i.e., independent of the details of the models used to obtain the numerical results. I show that these generic predictions are all confirmed with an impressive accuracy by LHC $p$+Pb data, as well as by RHIC $p$+Au, $d$+Au, and $^3$He+Au data. I eventually discuss $p$+$p$ collisions, where the signatures of hydrodynamic behavior appear to be less visible.

Speaker: Giuliano Giacalone (IPhT Saclay)

Slides 346-0-cipanp.pdf

190 Current Status of Hydrodynamic Modeling from $p$+$p$ to Heavy Ions

In recent years, suggestive signatures of collective flow-like behavior have been observed in $p$+$p$ collisions at the LHC and also in light+heavy-ion collisions. We review hydrodynamic model calculations that reasonably describe the experimentally measured $dN_\mathrm{ch}/d\eta$ and $v_2,v_3,v_4$ at $\eta=0$ in collisions from Pb+Pb down to $p$+$p$. Nevertheless, it is still uncertain whether the flow-like correlations in small collisions should be ascribed the same hydrodynamic origin as in heavy+heavy-ion collisions. Resolving this problem requires knowing (1) how a proton should impart its fluctuating shape on hydrodynamic initial data (e.g. $\varepsilon_2$, $\varepsilon_3$), and (2) in what situations hydrodynamics is justified. It turns out the entire non-hydrodynamic behavior of a system is encoded at large orders in the hydrodynamic gradient expansion, whose resummation yields a subset of microscopic system trajectories known as a hydrodynamic attractor. The behavior of trajectories near this attractor define an "off-equilibrium" version of hydrodynamics, whose applicability for small collisions is justified. This provides an answer to (2), but leaves (1), the choice of hydro initial data, as an open issue.

Speaker: Ryan Weller (MIT)

Slides 122-0-rweller-CIPANP_2018.pdf

15:40 Break

Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity: Parallel 6 — Cosmological Surveys

Convener: Kev Abazajian (UC Irvine)

191 Recent Results from the Dark Energy Survey

The Dark Energy Survey has recently demonstrated powerful cosmological constraints obtained using first year observations of galaxy positions and gravitational lensing of galaxy images. In the near future, these analyses will be extended to include cross-correlations with gravitational lensing of the cosmic microwave background, and constraints from other cosmological probes. I will summarize recent results and discuss near-term improvements.

Speaker: Eric Baxter (University of Pennsylvania)

Slides 329-0-baxter_des_nomovies.pdf 329-1-baxter_des_movies.key

192 The eBOSS Survey: Recent Results and Prospects

I will present recent results and prospects for the SDSS/eBOSS survey (2014-2019), the last program completing the SDSS cosmological observations, which started some twenty years ago. The primary goal of those observations is to constrain dark energy through the measure of the distance-redshift relation with baryon acoustic oscillations (BAO) in the clustering of matter. eBOSS will use one million objects divided in four different tracers to expand the volume covered by SDSS/BOSS focusing on the redshift range [0.6,2.2]. The eBOSS data will also bring constraints on other cosmological topics, as test of General Relativity on cosmological scales through redshift-space distortion measurements, or new constraints on the summed mass of all neutrino species.

Speaker: Dr Anand Raichoor (EPFL)

Slides 19-0-Raichoor_PalmSprings_31May2018.pdf

193 Cosmology with the Atacama Cosmology Telescope

Full-sky Cosmic Microwave Background (CMB) temperature data from the Planck satellite tightly constrains the six $\Lambda$CDM parameters, reinforcing the success of the current model in describing the CMB sky. However, more precise cosmological measurements show tensions between the high-redshift and low-redshift probes, with a discrepancy in the value of the Hubble constant, $H_0$, at a significance higher than $3 \sigma$. Although these results could suggest a failure of the present model, the accuracy of the current measurements has been questioned. The Atacama Cosmology Telescope (ACT) is currently mapping forty percent of the CMB sky at high resolution. In this talk, I will show how such a unique dataset will allow us to investigate the current tensions. I will highlight the complementarity of a high-resolution experiment also capable to extract high-fidelity information from the polarization of the CMB. I will conclude with future prospects for the next generation CMB experiments.

Speaker: Dr Simone Aiola (Princeton University)

194 BICEP/Keck: Constraining the Primordial Gravitational-Wave Signal with CMB Polarization Observations from the South Pole

The inflationary scenario generically predicts the existence of primordial gravitational waves (GW), though over a wide range of amplitudes from slow-roll to multi-field models. Currently the most promising method for constraining, and potentially detecting, an inflationary GW background is to search for the imprint that these tensor perturbations would leave on the cosmic microwave background (CMB) polarization as a parity-odd “B-mode” pattern. The BICEP/Keck experiments (BK) target this primordial signature by observing the polarized microwave sky at degree-scale resolution from the South Pole. Attempting to observe the very faint primordial B-mode signal requires a telescope with exquisite sensitivity and tight control of systematics. The presence of bright Galactic emission, along with the distortion of the CMB polarization field due to gravitational lensing, make this measurement extremely challenging. In order to disentangle the primordial signal from these “foregrounds”, a wide frequency coverage is necessary. I will present the latest BK constraints on the tensor-to-scalar ratio “$r$” using data taken from 2010 to 2015 at 90, 150, 220 GHz (BK15), in combination with data from the Planck and WMAP satellites. Upcoming observations with the “Stage-3” BICEP Array experiment will extend this frequency range to 30–270 GHz, ultimately improving our sensitivity to $r$ by an order of magnitude with respect to BK15, thus constraining natural inflation and all single-field models.

Speaker: Dr Lorenzo Moncelsi (California Institute of Technology)

Slides http://www.astro.caltech.edu/~moncelsi/CIPANP2018_Moncelsi.pptx

195 The Simons Observatory and CMB-Stage IV

The Simons Observatory (SO) will make precision temperature and polarization measurements of the cosmic microwave background (CMB) over angular scales between 1 arcminute and tens of degrees using over 40,000 detectors and sampling frequencies between 27 and 270 GHz. SO will consist of a six-meter-aperture telescope coupled to over 20,000 detectors and an array of half-meter aperture refractive cameras, coupled to an additional 20,000 detectors. The unique combination of large and small apertures in a single CMB observatory will allow us to sample a wide range of angular scales over a common survey area while providing an important stepping stone towards the realization of CMB-Stage IV. CMB-Stage IV is a proposed project that will combine and expand on existing facilities in Chile and Antarctica to reach the $\sim$500,000 detectors required for the project's science objectives. SO and CMB-Stage IV will measure fundamental cosmological parameters of our universe, find high-redshift clusters via the Sunyaev-Zeldovich effect, constrain properties of neutrinos, and seek signatures of dark matter through gravitational lensing. The complex set of technical and science requirements for these experiments has led to innovative instrumentation solutions which we will discuss. For instance,the SO large aperture telescope will couple to a cryogenic receiver that is 2.4 m in diameter and over 2 m long, creating a number of technical challenges. We will give an overview of the drivers for, and designs of, the SO telescopes and cameras as well as the current status of the project. We will also discuss the current status of CMB-Stage IV and important next steps in the project's development.

Speaker: Dr Nicholas Galitzki (University of California, San Diego)

Dark Matter: Parallel 6 — High Mass Dark Matter

Conveners: Prof. George Fuller (University of California, San Diego), Prof. Matt Pyle (University of California Berkeley)

196 Searching for Ultra-Heavy Dark Matter

Observational bounds on the mass of dark matter could allow the dark matter to be as heavy as $10^{48}$ GeV. Such ultra-heavy dark matter candidates emerge as composite objects produced as a result of significant self-interactions in the dark sector. Detection of this kind of dark matter raises new challenges — the low number density of these particles requires detectors with a large target volume, while the transit of an individual ultra-heavy dark matter particle can lead to significant energy deposition. Leveraging the fact that the transit speed of dark matter is $\sim$220 km/s, well below relativistic speeds but above terrestrial speeds, we discuss methods to search for ultra-heavy dark matter.

Speaker: Surjeet Rajendran (UC Berkeley)

Slides 332-0-Ultraheavy.pdf

197 Darkside Status and Prospects

DarkSide uses dual-phase Liquid Argon Time Projection Chambers to search for WIMP dark matter. The talk will present the latest result from the current experiment, DarkSide-50, running since mid 2015 using a 50-kg-active-mass TPC, filled with argon from an underground source. The next stage of the DarkSide program will be a new generation experiment involving a global collaboration from all the current Argon based experiments. DarkSide-20k, based on a 20-tonne fiducial mass TPC with SiPM based photosensors, is designed to have a background well below that from coherent scattering of solar and atmospheric neutrinos. Like its predecessor, DarkSide-20k will be housed at the Gran Sasso (LNGS) underground laboratory, and it is expected to attain a WIMP-nucleon cross section of $10^{-47}$ cm$^2$ for a WIMP mass of 1 TeV/$c^2$ in a 5 year run.

Speaker: Mr Luca Pagani (UC Davis)

Slides 324-0-LPagani_CIPANP18.pdf

198 Results and Plans for the PICO Dark Matter Bubble Chamber

This talk will present the current status of the PICO dark matter experimental program. The PICO detectors are based on the bubble chamber technology and record potential interactions of WIMPs in the target fluid through phase transitions induced by the energy depositions of recoiling nuclei. The technique is complementary to other dark matter search methods and has lead to recent world-leading results for spin-dependent WIMP interactions. The current state of the results from PICO operations will be presented, as well as an update on the status and prognosis for the new detector configuration PICO-40, currently being installed at SNOLAB. The future prospects for a tonne scale “PICO-500” will also be described.

Speaker: Prof. Anthony Noble (Queens University)

Slides 239-0-CIPANP_Noble_PICO_2018.pptx 239-1-CIPANP_Noble_PICO_2018.pdf

199 The Latest Analyses of the LUX Dark Matter Project

More recent results will be shared from the Large Underground Xenon (LUX) detector, which was a 100-kg-scale, 2-phase xenon direct dark matter search experiment, operated between 2013–16 at SURF. Dark matter, the missing 25% of the mass-energy content of the universe, is sought in more ways, using effective field theory operators to extend the search to higher-mass Weakly Interacting Massive Particles (WIMPs), and electron instead of nuclear recoil, to seek axions and mirror dark matter. In addition, annual and diurnal modulation analyses of the 427 live-days of exposure will be explored. Lastly, old and new calibrations (including $^{14}$C $\beta$, $^{127}$Xe, $^{83m}$Kr, and D-D neutron) and position, energy, field, and pulse-shape reconstruction techniques plus trigger efficiency will be reviewed, in the context of new background and signal models being developed by LUX which will extend to higher energies than ever before.

Speaker: Matthew Szydagis (U Albany)

Slides 101-0-LUX_Szydagis_CIPANP.pdf

200 LUX Sensitivity to Effective Field Theory Interactions

The past two decades have seen a tremendous increase in the sensitivity of direct detection experiments. In the absence of a definitive dark matter detection, the Large Underground Xenon (LUX) campaign (which ran underground at the Sanford Underground Research Facility from 2013 to 2016) has worked to constrain a far broader set of dark matter interactions than the spin-independent and spin-dependent results that are typically reported. Here we review a non-relativistic effective field theory framework that describes a rich set of momentum-and-velocity dependent dark matter-nucleon interactions in a model-independent way. We comment on complementarity between experimental targets and techniques. Finally, we discuss LUX’s sensitivity to this class of interactions both in isolation and in the case of interference between interactions.

Speaker: Dr Nicole Larsen (University of Chicago / Kavli Institute for Cosmological Physics)

Slides 271-0-larsen_cipanp2018.pdf

201 Position Reconstruction Using Photon Timing for the DEAP-3600 Liquid Argon Dark Matter Experiment

DEAP-3600 is a single-phase liquid argon (LAr) dark matter detector being operated 2 km underground at SNOLAB. The ultra-pure LAr target is contained in a spherical acrylic vessel of 3600 kg capacity, viewed by an array of 255 photomultiplier tubes (PMTs). The expected sensitivity to the spin-independent WIMP-nucleon cross-section is $10^{-46}$ cm$^2$ at 100 GeV WIMP mass. Natural radioactive contamination can cause alpha decays originating in the acrylic vessel or TPB wavelength shifter, or gamma rays, mostly from PMT materials, that may induce Cerenkov light. These are potential surface backgrounds. Reconstruction of the position of the interactions taking place in the detector utilizes both charge and timing. Including this information in our suite of cuts allows us to identify and remove almost all surface background events. An overview and the results of the initial filling phase is presented. A method of event position reconstruction emphasizing photon timing will be discussed.

Speaker: Dr Yu Chen (University of Alberta)

Slides 202-1-cipanp_deap3600.pdf

202 COSINE-100 and Tests of DAMA

Astrophysical observations give overwhelming evidence for the existence of dark matter. While the DAMA collaboration has asserted for years that they observe a dark matter-induced annual modulation signal in their NaI(Tl)-based detectors, their observations are inconsistent with those from other direct detection dark matter experiments under most assumptions of dark matter. I will describe the COSINE-100 experiment and other low-background NaI(Tl)-based dark matter experiments, and our progress toward resolving the current stalemate in the field.

Speaker: Reina Maruyama (Yale University)

Slides 307-0-Maruyama_CIPANP2018.pdf

Neutrino Masses and Neutrino Mixing: Parallel 6 — LBNE | Neutrino Cross Sections

Conveners: Prof. Andre de Gouvea (Northwestern University), Daniel Dwyer

203 Overview of DUNE

The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline experiment. DUNE will utilize a high-intensity neutrino beam produced at Fermilab and will measure electron-neutrino appearance and muon-neutrino disappearance with its 40 kiloton Liquid Argon far detector at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, 1300 km from Fermilab. The goals of DUNE are studies of neutrino oscillations, including CP violation and neutrino mass hierarchy determination, and searches for nucleon decays and supernova neutrinos, as well as precision neutrino physics at the near site. The DUNE far detectors are based on liquid argon time projection chamber (LArTPC) technology, which offers an excellent spatial resolution, high neutrino detection efficiency, and superb background rejection. Two large DUNE far detector prototypes, in both single phase LArTPC (ProtoDUNE-SP) and dual phase LArTPC (ProtoDUNE-DP) technologies, are under construction and will be operated at the CERN Neutrino Platform (NP) starting in late 2018. In this talk, we will give an overview of the physics program and current status of the DUNE experiment.

Speaker: Prof. Jianming Bian (UC Irvine)

Slides 299-0-DUNE_CIPANP2018_05_31.compressed.pdf

204 Measurements of Neutrino-Nucleus Scattering from 0.1–10 GeV

Neutrino interactions and nuclear modeling are among the largest systematic uncertainties in neutrino oscillation experiments, which must infer the true neutrino energy from scattering products on heavy targets such as carbon, oxygen, or argon. Recent data from MiniBooNE, T2K, and MINERvA indicate shortcomings in current theoretical models of neutrino cross sections on nuclei. I will present an overview of measurements of neutrino scattering in the range of 0.1 to 10 GeV, and discuss prospects for the future.

Speaker: Christopher Marshall

Slides 268-0-chrisMarshall_cipanp18_nuXS.pdf

205 The CAPTAIN Program: Status and Plans

The Cryogenic Apparatus for Precision Tests of Argon Interactions with Neutrinos (CAPTAIN) program makes measurements that are crucial for the future DUNE experiment. DUNE aims to study neutrino oscillation phenomena with high precision with long-baseline and atmospheric neutrinos, and the electron-neutrino spectrum from galactic core-collapse supernovae. CAPTAIN addresses challenges with both of these programs by making measurements of the liquid-argon time-projection chamber (LArTPC) response to medium-energy neutrons and by measuring the electron-neutrino on argon cross-section in an energy regime coincident with the neutrino spectrum expected from supernovae. CAPTAIN has deployed Mini-CAPTAIN, a 400-kg instrumented-mass LArTPC, in a neutron beamline at the Los Alamos Neutron Science Center that provides neutrons of energies up to 800 MeV. I report the status of the analysis of these measurements and their implications for DUNE’s long-baseline neutrino oscillation program. Next, the 5-ton instrumented-mass CAPTAIN detector will be deployed in a stopped-pion neutrino source. This will constitute the first demonstration that LArTPC’s can measure neutrinos in an energy regime relevant to supernova physics.

Speaker: Prof. Christopher Mauger (University of Pennsylvania)

Slides 319-2-MaugerCIPANPMay2018v5a.pdf

206 Neutrino Scattering Studies in MicroBooNE

A good understanding of the cross sections for neutrino interactions with nucleons and nuclei is crucial for neutrino oscillation studies, in addition to providing a tool for the exploration of nucleon and nuclear structures. The MicroBooNE liquid-argon time-projection-chamber (LArTPC) experiment has been taking neutrino data with the Booster Neutrino Beam at Fermilab since 2015. The LArTPC capabilities in track reconstruction, energy measurement, and particle identification allow us to probe interesting regions of neutrino-argon scattering cross sections and to probe the quark composition of the nucleon and test models of nuclear structure and final-state interactions. We present the current status of several on-going MicroBooNE cross section analyses, as well as plans for future measurements.

Speaker: Vassili Papavassiliou (New Mexico State University)

Slides 201-0-MicroBooNE.pdf

207 Hadron Production Measurements for Long-Baseline Neutrino Experiments with NA61/SHINE

A precise prediction of the neutrino flux is a key ingredient for achieving the physics goals of long-baseline neutrino experiments. In modern accelerator-based neutrino experiments, neutrino beams are created from the decays of secondary hadrons produced in hadron-nucleus interactions. Hadron production is the leading systematic uncertainty source on the neutrino flux prediction; therefore, its precise measurement is essential. The NA61/SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) is a fixed-target experiment at the CERN Super Proton Synchrotron, which studies hadron production in hadron-nucleus and nucleus-nucleus collisions for various physics goals. For neutrino physics, light hadron beams (protons, pions, and kaons) are collided with a light nuclear target (carbon, aluminum, and beryllium) and spectra of outgoing hadrons are measured. This talk will review the recent results and ongoing hadron production measurements in NA61/SHINE for the precise neutrino flux predictions in the T2K and Fermilab long-baseline neutrino experiments. For the T2K experiment, the interactions of 31 GeV/$c$ proton beams on a thin carbon or a replica of the T2K 90 cm-long carbon target were measured and these measurements have significantly reduced T2K's neutrino flux uncertainty. For the Fermilab long-baseline neutrino beamlines (NuMI and LBNF), measurements are currently ongoing for 60–120 GeV proton, pion, and kaon beams on various nuclear targets. This talk will also discuss the prospects for future hadron production measurements with NA61/SHINE beyond 2020, after the Long Shutdown 2 of the accelerator complex at CERN.

Speaker: Dr Yoshikazu Nagai (University of Colorado Boulder)

Slides 284-0-CIPANP2018_nagai_v3.pdf

208 Isolating Neutrino Cross Section Uncertainties with Theory

Studies of neutrino oscillation physics lay at the intersection point of nucleon physics, nuclear physics, and experimental physics. Computations of the neutrino scattering cross sections that are necessary to understand oscillation physics require nuclear models with weak matrix elements of the nucleon. These matrix elements are difficult to probe experimentally or can be subject to substantial systematic corrections, and common model parametrizations significantly underestimate the uncertainties of the pertinent nucleon amplitudes. Furthermore, these amplitudes are often determined from scattering of neutrinos with nuclei, which entangles the uncertainties from nucleon amplitudes and nuclear model assumptions. In this talk, I will highlight recent work to dissect and understand the uncertainties from neutrino scattering with free nucleons, with the intention of providing realistic estimates of the nucleon amplitude uncertainties. These studies include use of the model-independent z-expansion parametrization to reanalyze deuterium bubble chamber data as well as preliminary first-principles calculations from lattice QCD. With robust estimates of the uncertainty, it will then be possible to unambiguously isolate the discrepancies with experimental data that come from nucleon amplitudes and nuclear models.

Speaker: Dr Aaron Meyer (Brookhaven National Laboratory)

Slides 136-0-cipanp1.1.pdf

Nuclear Forces and Structure, NN Correlations, and Medium Effects: Parallel 6 — Nucleon/Nuclear Structure and Fundamental Symmetries

Convener: Dr John Arrington (Argonne National Laboratory)

209 The Nucleon Axial Coupling from Quantum Chromodynamics

The $\textit{axial coupling of the nucleon}$, $g_A$, is the strength of its coupling to the $\textit{weak}$ axial current of the Standard Model, much as the electric charge is the strength of the coupling to the electromagnetic current. This axial coupling dictates, for example, the rate of $\beta$-decay of neutrons to protons and the strength of the attractive long-range force between nucleons. Precision tests of the Standard Model in nuclear environments require a quantitative understanding of nuclear physics rooted in Quantum Chromodynamics, a pillar of this theory. The prominence of $g_A$ makes it a benchmark quantity to determine theoretically, a difficult task as the theory is non-perturbative. Lattice QCD provides a rigorous, non-perturbative definition of the theory which can be numerically implemented. In order to determine $g_A$, the lattice QCD community has identified two challenges which must be overcome to achieve a 2% precision by 2020: the excited state contamination must be controlled and the statistical precision must be markedly improved. Here we report a calculation of $g_A^\mathrm{QCD} = 1.271 \pm 0.013$ using an unconventional method that overcomes these challenges.

Speaker: Dr Chia Cheng Chang (LBL)

Slides 186-0-Chang_gA_CIPANP18.pdf

210 The Nucleon Axial Form Factor from Quantum Chromodynamics

The nucleon axial form factor is needed to calculate the cross-section of neutrino interactions with nuclei. Due to lack of data on neutrino scattering off protons, one has to model the effect of nuclear interactions to extract it from neutrino scattering data off heavier nuclei. It is also being calculated from first principles analysis of QCD using large scale simulations of lattice QCD. By comparing the phenomenological and lattice QCD form factors, one can help constrain the modeling of nuclear effects. This talk will summarize the status of lattice QCD calculations and discuss the challenges and prospects for high precision results.

Speaker: Dr Rajan Gupta (Los Alamos National Lab)

Slides 263-0-Gupta_AFF_2018_May_CIPANP.pdf

211 Neutrinoless Double Beta Decay in Chiral Effective Field Theory

Within the framework of chiral effective field theory I will discuss the leading contributions to the neutrinoless double-beta decay transition operator induced by light Majorana neutrinos. Based on renormalization arguments, I will argue that one needs to introduce a leading-order short-range operator, missing in all current calculations. I will then discuss strategies to determine the finite part of the short-range coupling by matching to lattice QCD or by relating it via chiral symmetry to isospin-breaking observables in the two-nucleon sector. Finally, I will estimate the impact of this new contribution on nuclear matrix elements of relevance to experiment.

Speaker: Dr Vincenzo Cirigliano (Los Alamos National Laboratory)

Slides 121-0-Cirigliano-CIPANP.pdf

212 Current Status of Neutrinoless Double-Beta Decay Matrix Elements

Observing neutrinoless double-beta ($0\nu\beta\beta$) decay is the most promising way to detect lepton number violation in the laboratory, and it would imply that neutrinos are their own antiparticles. The decay half-life naturally depends on a nuclear matrix element that needs to be calculated theoretically. A good knowledge of this matrix element is key for the planning of $0\nu\beta\beta$ decay experiments, and also to extract information on the neutrino mass once $0\nu\beta\beta$ decay is observed. Currently predicted matrix-element values depend on the many-body method used to calculate them and, in addition, they may need to be "quenched", as the matrix elements of other beta decays that, however, have a very different momemtum-transfer regime. I will discuss recent efforts towards obtaining reliable nuclear matrix elements, ranging from improved calculations with phenomenological many-body approaches, to the first applications of "ab initio" many-body methods to $0\nu\beta\beta$ decay, finalizing with possible measurements that could be very useful to test calculations and to provide information on the value of the $0\nu\beta\beta$ matrix elements.

Speaker: Javier Menendez (Center for Nuclear Study, University of Tokyo)

Slides 114-0-menendez_cipanp.pdf

213 Overview of Nuclear Beta Decay Tests of Fundamental Symmetries

We will present an overview on the present status and outlook of experiments using nuclear beta decays to search for new physics. At the low-momentum transfers associated with nuclear beta decays, phenomena associated with new physics at high-energy scales can show up as right-handed or chirality-flipping (tensor or scalar) currents, all absent in the Standard Model. We will describe ongoing experimental efforts, future perspectives in the field, and the needs from nuclear structure theory to carry out the program.

Speaker: Alejandro Garcia (University of Washington)

Slides 76-0-beta-decay.pdf

214 Multi-Wire 3D Gas Tracker for Searching New Physics in Nuclear Beta Decay

Searches of new physics beyond the Standard Model (SM) performed at low energy frontiers are complementary to experiments carried out at high energy colliders. Often used methods for testing the SM and beyond at low energies are precision spectrum shape and correlation coefficient measurements in nuclear and neutron beta decay. In order to study tiny effects in beta spectrum shape, a special spectrometer was built. It consists of a 3D low pressure gas tracker (drift chamber with hexagonal cells, signal readout at both wire ends) and plastic scintillators for triggering a data acquisition and registration of the beta particle energy [1]. The results of the characterization process indicate the possibility of using such a gas tracker in a range of experiments with low energy electrons where beta particle tracking with minimal kinematics deterioration is beneficial. Application of this technique is also planned for a neutron decay correlation experiment [2]. In the presentation, the first application of this tracker in a high-precision beta spectrum shape study will be discussed. It is devoted to the determination of the weak magnetism term in nuclear beta decay [3,4]. [1] K. Lojek, D.Rozpedzik, K. Bodek, M. Perkowski, N. Severijns, NIM A 802 (2015) 38 [2] K. Bodek, Acta Phys. Pol. B, 47 (2016) 349 [3] N. Severijns, J. Phys. G: Nucl. Part. Phys. 41 (2014) 114006 [4] L. Hayen, N. Severijns, K. Bodek, D. Rozpedzik, X. Mougeot, Rev. Mod. Phys. 90 (2018) 015008

Speaker: Dr Dagmara Rozpedzik (Jagiellonian University)

Slides 63-0-ROZPEDZIK-CIPANP2018.pdf

PPHI / TSEI: Parallel 6 — Symmetry Tests

Conveners: Renee Fatemi (University of Kentucky), Prof. Robert Redwine (Massachusetts Institute of Technology)

215 Precision Atomic Tests of Physics Beyond the Standard Model

We will give an overview of atomic precision measurements as tests of physics beyond the Standard Model, such as searches for "fifth forces", tests of fundamental symmetries with clocks, and searches for an electric dipole moment of the electron. In particular, measurements of the fine structure constant $\alpha$ use methods from across sub-fields and are thus powerful tests of the consistency of theory and experiment in physics. Using the recoil frequency of cesium-133 atoms in a matter-wave interferometer, we report the most accurate measurement, $\alpha = 1/137.035999046(27)$, at $2.0\times 10^{-10}$ accuracy. Comparison with Penning-trap measurements of the electron gyromagnetic anomaly $g-2$ via the Standard Model is now limited by the uncertainty in $g-2$; a 2.5-sigma tension has implications for dark sector candidates and electron substructure may be a sign of physics beyond the Standard Model that warrants further investigation.

Speaker: Holger Mueller

Slides 267-0-MUELLER_CIPANP2018.pptx

216 Muon g-2 Experiments at FNAL and J-PARC

The measurement of the anomalous magnetic moment of the muon made at Brookhaven National Laboratory differs from the Standard Model expectation by over 3 standard deviations. A new experiment at Fermilab, using the same storage ring as the Brookhaven experiment, aims to improve the accuracy of this measurement by a factor of 4, and an additional experiment, using a new technique, at J-PARC is scheduled. The results from these experiments are among the most eagerly anticipated in particle physics. The Fermilab g-2 experiment began data taking this year, and a summary of the early measurements will be presented, together with the status, timeline and expected sensitivity of the two experiments.

Speaker: Dr Joseph Price (University of Liverpool)

Slides 277-0-CIPANP-JospehPrice.pdf

217 New Results on Low-Energy Exclusive Hadronic Cross Sections from BaBar and Implications for g-2 of the Muon

The BABAR Collaboration has an extensive program studying hadronic cross sections in low-energy $e^+e^-$ collisions, accessible through the selection of events with initial-state photon radiation. The measurements allow significant improvements in the precision of the standard model prediction for the muon anomalous magnetic moment. Recent results on the $\pi^+\pi^-\pi^0\pi^0$ final state and on $KK\pi\pi$ final states are presented. The $\pi\pi\pi\pi$ channel is one of the most important for the muon g-2 calculation, while our measurements of the $KK\pi\pi$ channels obviate the need to rely on isospin relations and greatly improve the results in these channels.

Speaker: Prof. Bill GARY (University of California, Riverside)

Slides 149-0-gary-cipanp-2018.pdf

218 Baryogenesis via Particle–Antiparticle Oscillations

Our Universe has more matter than antimatter and we cannot explain this asymmetry within the Standard Model. CP violation is crucial to explain the baryon asymmetry of the Universe. We observe CP violation in the SM in neutral meson oscillations. Can similar (but beyond the SM) particle–antiparticle oscillations in the early Universe generate the baryon asymmetry? I will show "Yes, they can!" and give a specific new physics model as an example.

Speaker: Dr Seyda Ipek (University of California Irvine)

Slides 61-0-ipek_pseudogenesis_CIPANP18.pdf

219 Search for Neutron-Antineutron Oscillations at the Sudbury Neutrino Observatory

Tests on $|B-L|$ symmetry breaking models are important probes to search for new physics. One proposed model with $|\Delta (B-L)=2|$ involves the oscillation of a neutron to an antineutron. In this talk, the recently published results for a search of this process in the deuteron from the data acquired from all three operational phases of the Sudbury Neutrino Observatory experiment will be summarized. Discussions on the observable signature of such a process and an upper limit on the free neutron-antineutron oscillation time will also be provided.

Speaker: Dr Marc Bergevin (LLNL)

Slides 203-0-NeutronAntineutronCIPANP2018Bergevin.pdf

220 Neutron-Antineutron Conversion to Search for B-L Violation

Neutron-antineutron ($n$–$\bar{n}$) conversion describes the change of a neutron into an antineutron as mediated by an external source. As a result its ability to occur is not limited by the presence of magnetic fields or matter, as would be the case if a neutron were to transform spontaneously, or to oscillate, into an antineutron. We explore the limits on the appearance of baryon number minus lepton number (B-L) violation that can be set through the study of the conversion process, notably through scattering experiments employing intense beams, and we discuss the conditions under which such studies can also yield limits on the neutron's Majorana mass.

Speaker: Prof. Susan Gardner (University of Kentucky)

Slides 161-0-svg_nnbar_cipanp18.pdf

Particle and Nuclear Astrophysics: Parallel 6 — Particle Astrophysics

Conveners: Dr Barry Davids (TRIUMF), Wick Haxton

221 Latest Results from the AMS Experiment on the International Space Station

The Alpha Magnetic Spectrometer (AMS) is a multi-purpose high-energy particle physics detector in space. It was installed on the International Space Station (ISS) in May 2011 to conduct a unique long-duration mission of fundamental physics research in space. In seven years AMS has collected more than 115 billion charged cosmic rays with energies up to TeV region performing the most precise measurement of galactic cosmic rays to date. An overview of the latest results from AMS will be presented.

Speaker: Dr francesca giovacchini (ciemat)

Slides 133-0-CIPANP_AMSResults.pdf

222 New Results and Update on Ultrahigh Energy Cosmic Rays

This talk will have two components. The main part will survey the state-of-knowledge about UHECRs, emphasizing recent results from the Pierre Auger Observatory on anisotropies and possible source correlations. A short second part will report on multi-messenger constraints combining Auger, Fermi-LAT and IceCube data, on pure-proton and mixed-composition source models.

Speaker: Glennys Farrar (NYU)

Slides 360-0-CIPANP_Auger_053118.pdf 360-1-MFUA_CIPANP_053118.pdf

223 Recent Highlights from the High Altitude Water Cherenkov Observatory

The High Altitude Water Cherenkov (HAWC) Observatory has been surveying the TeV sky for over 3 years. HAWC surveys 2/3rd of the sky each day with a wide field-of-view, high duty-cycle, and wide energy range. HAWC is a powerful instrument to study key aspects of particle astrophysics, including the production, propagation, and interaction of cosmic rays, searches for dark matter, and locating the highest energy (>100 TeV) gamma-ray sources. It can also monitor for variable sources and transients. We will discuss the discovery of TeV halos around middle-aged nearby pulsars that shed new light on the positron excess puzzle. We will also discuss new TeV sources that have been discovered, including possible PeV cosmic ray sources (PeVatrons). Additionally, we will discuss searches for GRBs, gravitational wave events, and dark matter.

Speaker: Andrea Albert (SLAC)

Slides 85-0-aalbert_hawc_cipanp_2018.pdf

224 IceCube/DeepCore Results on Neutrino Properties Using Atmospheric Neutrinos

The IceCube Neutrino Observatory at the South Pole can measure atmospheric neutrinos at energies up to the TeV scale. DeepCore is the low-energy subarray that provides sensitivity in the neutrino energy range from roughly 10 GeV to 100 GeV, where Earth-crossing neutrinos are subject to flavor-oscillation phenomena. These neutrinos are muon and electron neutrinos produced in Earth's atmosphere via decays of particles from interactions between cosmic rays and the atmosphere. The primary oscillations detected are from muon neutrinos to tau neutrinos. We present the measurement of muon neutrino disappearance and tau neutrino appearance using three years of IceCube-DeepCore data.

Speaker: Ms Feifei Huang (The Pennsylvania State University)

Slides 87-0-CIPANP_FeifeiHuang__2_.pdf

225 Recent Status and Future Plans for the China JinPing Underground Laboratory

China Jinping Underground Laboratory (CJPL) is the deepest laboratory and an ideal site for rare-event experiments such as dark matter, neutrinoless double beta decay, solar neutrino experiment, and so on. It is located in the Jinping Mountain, Sichuan Province, southwest China, with an overburden of about 2,400 m. The laboratory is operated by Tsinghua University and Yalong River Hydropower Development Company, Ltd. This paper will give an overview of conditions, status and future plans of the laboratory. Main experiments and scientific activities carried out at CJPL will also be presented. The experimental programs for direct detection of dark matter at CJPL will also be introduced.

Speaker: Dr Qian Yue (Tsinghua University)

Slides 65-0-QianYue-CJPL.pdf

226 NuSTAR and Super-Eddington Accretion onto Neutron Stars

The Nuclear Spectroscopic Telescope Array (NuSTAR) is the first focusing X-ray telescope at hard energies in space. Since its launch in 2012, NuSTAR has opened up a sensitive new view on many energetic astrophysical phenomena, such as supernova explosions, black hole spin measurements and cosmic supermassive black hole accretion history. One of NuSTAR's main discoveries is that some bright X-ray sources in other galaxies, known as ultraluminous X-ray sources (ULXs), long believed to be powered by black holes, were in fact powered by neutron stars. Some of these neutron stars were found to be radiating factors of 1,000 greater than the theoretical Eddington limit would allow, confounding theory. I will talk about the NuSTAR telescope, the discovery of neutron-star-powered ULXs, and a recent measurement of the magnetic field strength of one of these sources that has provided clues about how they radiate so powerfully.

Speaker: Dr Murray Brightman (Caltech)

Slides 326-0-mbrightman_cipanp18.pdf

Quark Matter and High Energy Heavy Ion Collisions: Parallel 6 — Heavy Ions at the LHC

Conveners: Prof. Jacquelyn Noronha-Hostler (Rutgers University), Marta Verweij (Vanderbilt University)

227 Overview of Recent Results from the ATLAS Experiment

The heavy-ion program in the ATLAS experiment at the LHC originated as an extensive program to probe and characterize the hot, dense matter created in relativistic lead-lead collisions. In recent years, the program has also broadened to a detailed study of collective behaviour in smaller systems. In particular, the techniques used to study larger systems are also applied to proton-proton and proton-lead collisions over a wide range of particle multiplicities, to try and understand the early-time dynamics which lead to similar flow-like features in all of the systems. Another recent development is a program studying ultra-peripheral collisions, which provide gamma-gamma and photonuclear processes over a wide range of CM energy, to probe the nuclear wavefunction. This talk presents the most recent results from the ATLAS experiment based on Run 1 and Run 2 data, including measurements of collectivity over a wide range of collision systems, potential nPDF modifications – using electroweak bosons, inclusive jets, and quarkonia – and photonuclear dijet production.

Speaker: Brian Cole (Columbia University)

Slides

• 54-2-ATLASOverviewCIPANP2018_v6.pdf
• 54-3-ATLASOverviewCIPANP2018_v7.pdf
• 54-4-ATLASOverviewCIPANP2018_v8.pdf

228 Overview of Recent Heavy Ion Results from the CMS Experiment

We present a summary of recent heavy ion results with CMS, including several topics of interest to the study of quark matter. Our interest involves characterizing the properties of the quark-gluon plasma, such as its temperature and transport coefficients, and the dynamical properties leading to collective behavior. We have explored the onset of collectivity in small systems via azimuthal correlations in $p$-Pb collisions. We discuss energy loss of high momentum partons via measurements of photon-tagged jets, jet shapes, heavy-flavor jets, and reconstruction of heavy-flavor hadrons. We present results on hot and cold nuclear effects on charmonia and bottomonia via measurements in $p$-Pb and Pb-Pb. In addition, measurements obtained during the 1-day Xe-Xe test run at the LHC, comparing them to the Pb-Pb case, will also be presented. We discuss measurements of $W$ bosons and top quark production in $p$-Pb collisions, which can constrain nuclear PDFs.

Speaker: Prof. Manuel Calderon de la Barca Sanchez (UC Davis)

Slides 363-0-MCalderon-CIPANP-CMS-HI-overview.pdf

229 ALICE Upgrades for Run3 and Physics Projections

The upcoming upgrade of the CERN LHC is a challenge and opportunity for ALICE (A Large Ion Collider Experiment). By sustaining a Pb–Pb readout rate of 50 kHz, ALICE will gain two orders of magnitude in statistics and conduct high-precision measurements of rare probes at low $p_\mathrm{T}$ values. ALICE is refitting the Time Projection Chamber with new, GEM-based readout chambers with electronics for continuous readout using the new SAMPA chip. The same chip will be utilized for the upgrade of electronics of the Muon Arm. To improve vertexing and tracking, especially at low $p_\mathrm{T}$ values, a new Inner Tracking System is being constructed based on ALIPIDE (ALICE Pixel Detector) — a custom designed sensor incorporating the specific requirements imposed by the physics program, including a high-granularity and low material budget of the non-active elements. ALIPIDE is also used by the Muon Forward Tracker intended to add vertexing capabilities to the Muon Spectrometer over a broad range of transverse momenta allowing ALICE to measure beauty down to $p_\mathrm{T}\sim0$ from displaced $J/\psi$ vertices and to have an improved precision for the $\psi$(2S) measurement. It will also add high-granularity data to the forward multiplicity information acquired by the new Fast Interaction Trigger. The TOF and TRD will get new readout electronics while PHOS, EMCAL, CPV, and HMPID will improve the readout rates with the existing electronics. The O2 system will offer new computing facility with online tracking and data compression.

Speaker: Wladyslaw Henryk Trzaska (University of Jyvaskyla)

Slides 250-0-Trzaska_CIPANP_v3_small.pdf

230 Parton Shower Modification Studied with Jet Substructure in ALICE

The heavy-ion physics program at the LHC aims at characterizing the high energy density, high temperature, deconfined partonic state of matter called Quark-Gluon Plasma. Hard probes are very useful tools to study the QGP properties since they are abundantly produced at the LHC energy regime, via hard scattering processes, and they experience the full evolution of the system, losing energy while passing through it. Eventually, these processes might also modify the parton fragmentation with respect to the vacuum case. Jet measurements in Pb–Pb collisions allow one to study how the energy is lost by the partons that traverse the medium and redistribute it to other particles present in the QGP. Moreover, measurements of the jet substructure can bring insight on possible modifications, induced by the medium, on fragmentation of partons into jets and their virtuality evolution. Jet substructure is probed using jet shape observables, defined as different combinations of information that jets carry at different levels (energy profile, jet constituents distributions, clustering history, ...). The measurement of these observables in $pp$ collisions is also an important test of QCD, to be compared with theoretical calculations and Monte Carlo generators. A review of recent jet shape measurements performed with the ALICE detector in $pp$ and Pb-Pb collisions will be presented.

Speaker: Mr Davide Caffarri (NIKHEF - Amsterdam)

Slides 314-0-D.Caffarri_jetSubstruct_CIPANP18.pdf

231 $b$-Jet Tagging Performance with ALICE

The ALICE experiment is dedicated to investigate properties of the Quark-Gluon Plasma (QGP) created in high-energy Pb–Pb collisions at the LHC. Heavy quarks (charm and beauty) are a unique tool to study and characterise the QGP properties. They are produced in the early stage of the heavy-ion collisions and traverse the hot and dense medium losing energy due to collisional and radiative processes that are predicted to be dependent on the colour charge and mass of the hard-scattered parton. Measurement of the beauty-jet ($b$-jet) production gives a direct access to the initial parton kinematics. It can provide further constraints for heavy-quark energy loss models and allows accessing a possible modification of the $b$-quark fragmentation in the medium. Studies of $b$-jets in $pp$ and $p$–Pb collisions are the necessary reference for interpreting the heavy-ion collision results. In this talk, we will present performance studies for the $b$-jet tagging in $pp$ and $p$–Pb collisions with the ALICE detector. The $b$-jet identification exploits the long lifetime and the relatively large mass of the $B$ hadrons. We will discuss $b$-jet tagging algorithms based on single tracks and on the displaced secondary vertex topology, including a very promising deep learning based $b$-jet tagging approach.

Speaker: Ms Barbara Trzeciak (Utrecht Univeristy)

Slides 289-0-CIPANP2018_BTrzeciak_ALICEbjets_final.pdf

232 The Application of Deep Learning to Event-by-Event Simulations of Relativistic Hydrodynamics

The state-of-the-art pattern recognition method in machine learning (deep convolution neural network) has been used to classify two different phase transitions between normal nuclear matter and hot-dense quark gluon plasma. Large amounts of training data have been prepared by simulating heavy ion collisions with event-by-event relativistic hydrodynamics. High level correlations of particle spectra in transverse momentum and azimuthal angle learned by the neural network are quite robust in deciphering the transition type in the quantum chromodynamics phase diagram. Through this study, we demonstrated that there is a traceable encoder of the phase structure that survives the dynamical evolution and exists in the final snapshot of heavy ion collisions and one can exclusively and effectively decode this information from the highly complex output using machine learning.

Speaker: Dr LongGang Pang (UC Berkeley and LBNL)

Slides 327-0-CIPANP_LongGang.pdf

Friday, 1 June

08:00 EXCURSION

Registration Desk: Open 13:30 – 17:30

Dark Matter: Parallel 7 — Dark Matter in Astrophysics

Convener: Prof. George Fuller (University of California, San Diego)

233 Dark Matter Interpretation of the Galactic Center Gamma Ray Excess

The Milky Way's Galactic Center harbors a gamma-ray excess that is a candidate signal of annihilating dark matter. Dwarf galaxies remain predominantly dark in their expected commensurate emission. In this talk I will discuss the degree of consistency between these two observations, quantified through a joint likelihood analysis. Doing so will incorporate Milky Way dark matter halo profile uncertainties, as well as an accounting of diffuse gamma-ray emission uncertainties in dark matter annihilation models for the Galactic Center Extended gamma-ray excess (GCE) detected by the Fermi Gamma-Ray Space Telescope. The preferred range of annihilation rates and masses expands when including these unknowns. Even so, using two recent determinations of the Milky Way halo's local density leave the GCE preferred region of single-channel dark matter annihilation models to be in strong tension with annihilation searches in combined dwarf galaxy analyses. This joint likelihood analysis allows us to quantify this inconsistency. This analysis allows for testing dark matter annihilation models' consistency within this combined dataset. As an example, we test a representative inverse Compton sourced self-interacting dark matter model, which is consistent with both the GCE and dwarfs.

Speaker: Dr Ryan Keeley (University of California Irvine)

Slides 335-0-GCE_Dwarfs.pdf

234 GAPS: a New Cosmic-Ray Antimatter Experiment

The General AntiParticle Spectrometer (GAPS) is a balloon-borne instrument designed to detect cosmic-ray antimatter using the novel exotic atom technique, obviating strong magnetic fields required by experiments like AMS, PAMELA, or BESS. It will be sensitive to primary antideuterons with kinetic energies of $\approx0.05-0.2$ GeV/nucleon, providing some overlap with the previously mentioned experiments at the highest energies. For $35\times3$ day balloon flights, and certain classes of primary antideuteron propagation models, GAPS will be sensitive to $m_\mathrm{DM}\approx10-100$ GeV $c^{-2}$ WIMPs with a dark-matter flux to astrophysical flux ratio approaching 100. This clean primary channel is a key feature of GAPS and is crucial for a rare event search. Additionally, the antiproton spectrum will be extended to cover the $0.07 \leq E \leq 0.25$ GeV domain. For $E>0.2$ GeV GAPS data will be complementary to established experiments, while $E<0.2$ GeV explores a new regime. The first flight is scheduled for late 2020 in Antarctica. This talk will describe the astrophysical processes and backgrounds relevant to the dark matter search, a brief discussion of detector operation, and construction progress made to date.

Speaker: Sean Quinn (University of California, Los Angeles)

Slides 224-0-Squinn_cipanp18_odp_v5.pdf

235 Cosmological Bounds on Non-Abelian Dark Forces

Non-Abelian dark gauge forces that do not couple directly to ordinary matter may be realized in nature. If the dark sector is reheated in the early universe, it will be realized as a set of dark gluons at high temperatures and as a collection of dark glueballs at lower temperatures, with a cosmological phase transition from one form to the other. These glueballs can be, if left alone, the cosmological dark matter. We explore the parameter space needed to satisfy present day densities. However, despite being dark, these new glueball states can also connect indirectly to the Standard Model through various operators. These interactions will transfer energy between the dark and visible sectors, and they allow some or all of the dark glueballs to decay. We investigate the cosmological evolution and decays of dark glueballs in the presence of connector operators to the Standard Model. Dark glueball decays can modify cosmological and astrophysical observables, and we use these considerations to put very strong limits on the existence of pure non-Abelian dark forces. On the other hand, if one or more of the dark glueballs are stable, we find that they can potentially make up the dark matter of the universe.

Speaker: Lindsay Forestell (TRIUMF, UBC)

Slides 164-0-cipanp_2018.pdf

236 Signatures of Superradiant Axions from Lasing and Binary Merger Events

Superradiant axions around black holes can produce electromagnetic signatures via lasing or via conversion to photons in a strong magnetic field. The latter can also produce gravitational wave signatures besides electromagnetic ones in binary merger events involving a strongly magnetized neutron star and a black hole (BHNS). Due to the smallness of the axion mass, medium effects of the black hole environment and the interstellar medium can significantly affect electromagnetic signatures from lasing. I discuss these medium effects and the conditions under which lasing can take place. I also find that a significant fraction of the energy in the axion condensate can be released via photons in a strong magnetic field of a neutron star within the characteristic time scale of merger events. This could lead to signatures in gravitational waves from merger events of BHNS pairs.

Speaker: Srimoyee Sen (University of Washington)

Slides 155-0-Medium_effects_on_Lasing_of_Superradiant_Axions_v5.pdf

Heavy Flavors and the CKM Matrix: Parallel 7 — Lattice QCD | Mixing | Decays

Convener: Wolfgang Altmannshofer (University of Cincinnati)

237 Short-Distance Matrix Elements for $D^0$-Meson Mixing from $N_f=2+1$ Lattice QCD

We calculate in three-flavor lattice QCD the short-distance hadronic matrix elements of all five $\Delta C=2$ four-fermion operators that contribute to neutral $D$-meson mixing both in and beyond the Standard Model. We use the MILC Collaboration's $N_f = 2+1$ lattice gauge-field configurations generated with asqtad-improved staggered sea quarks. We also employ the asqtad action for the valence light quarks and use the clover action with the Fermilab interpretation for the charm quark. We analyze a large set of ensembles with pions as light as $M_\pi \approx 180$ MeV and lattice spacings as fine as $a\approx0.045$ fm, thereby enabling good control over the extrapolation to the physical pion mass and continuum limit. We obtain for the matrix elements in the $\overline{MS}-NDR$ scheme using the choice of evanescent operators proposed by Beneke $\textit{et al.}$, evaluated at 3 GeV. To illustrate the utility of our matrix-element results, we place bounds on the scale of CP-violating new physics in $D^0$ mixing, finding lower limits of about 10–50 $\times 10^3$ TeV for couplings of $\mathcal{O}(1)$. To enable our results to be employed in more sophisticated or model-specific phenomenological studies, we provide the correlations among our matrix-element results. For convenience, we also present numerical results in the other commonly used scheme of Buras, Misiak, and Urban.

Speaker: Dr Chia Cheng Chang (LBL)

Slides 187-0-Chang_Dmix_CIPANP18.pdf

238 $B$ and $D$ Meson Leptonic Decay Constants and Quark Masses from Four-Flavor Lattice QCD

We describe a recent lattice-QCD calculation of the leptonic decay constants of heavy-light pseudoscalar mesons containing charm and bottom quarks and of the masses of the up, down, strange, charm, and bottom quarks. Results for these quantities are of the highest precision to date. Calculations use over twenty isospin-symmetric ensembles of gauge-field configurations with six different lattice spacings down to approximately 0.03 fm and several values of the light-quark masses down to physical values of the average up and down sea-quark masses. We use the highly-improved staggered-quark (HISQ) formulation for valence and sea quarks, including the bottom quark. The analysis employs heavy-quark effective theory (HQET). A novel HQET method is used in the determination of the quark masses.

Speaker: Carleton DeTar (University of Utah)

Slides 337-0-CD_CIPANP2018.pdf

239 Semileptonic $B_s$ Decays

Semileptonic $B_s \to K \ell \nu$ and $B_s \to D_s \ell \nu$ decays provide an alternative $b$-decay channel to determine the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ or obtain $R$-ratios to investigate lepton flavor universality violations. In addition, these decays may shed further light on the discrepancies seen in the analysis of inclusive vs. exclusive decays. Using the nonperturbative methods of lattice QCD, theoretical results are obtained with good precision and full control over systematic uncertainties. This talk will highlight ongoing efforts of the $B$-physics program by the RBC-UKQCD collaboration.

Speaker: Oliver Witzel (University of Colorado Boulder)

Slides 295-0-witzel_oliver.pdf

240 Unify the SU(3) Topological Diagram and Irreducible Representation Amplitudes for B Decays

Flavor SU(3) analysis of B meson charmless hadronic two light pseudoscalar decays can be formulated in two different ways. One is to construct the SU(3) irreducible representation amplitude (IRA) according to effective Hamiltonian transformation properties, and the other is to draw the topological diagrams (TDA). We first point out that previous analyses of TDA and IRA approaches do not match in several aspects, in particular a few SU(3) independent amplitudes have been overlooked in the TDA approach. This has caused confusions in the past and sometimes resulted in incorrect interpretation of data. We then demonstrate that only if these amplitudes are included, a consistent and unified picture can be obtained. With the new TDA amplitudes, all charmless hadronic decays of heavy meson must have nonzero direct CP symmetries as already predicted by the IRA approach. In addition to their notable impact on CP asymmetry, the new amplitudes are also important to extract new physics information.

Speaker: Prof. XIAO-GANG HE (NTU/SJTU)

NFS / QCDHS: Parallel 7 — The QCD–Nuclear Structure Interface

Conveners: Scott Bogner (Michigan State University), Dr Seamus Riordan (Argonne National Laboratory)

241 Status of Baryon-Baryon Interactions from Lattice QCD

I will review recent progress in obtaining baryon-baryon phase shifts and several paradigmatic reaction rates from lattice QCD simulations.

Speaker: Prof. Silas Beane (University of Washington)

Slides 194-0-cipanpSilasBeane18.pdf

242 HOBET: The SM as an Effective Theory and its Direct Matching to LQCD

The configuration interaction shell model operates in a subset of the complete Hilbert space defined by projection operator P. Unless P is very large, an effective theory treatment is required. Historically, the renormalization into P has been done informally, by adding a few physically motivated operators with associated parameters to the matrix elements of a realistic or chiral potential. The parameters are then tuned to reproduce a selected set of observables. While this approach has some success in reproducing the excitation spectrum of nuclei, the contact with the wave function is lost. Also, even if the P space wave function were the projection of the full wave function, the evaluation of a bare operator $\left< f \left| P \hat{O} P \right| i \right>$ between projections of initial and final states would miss longer and shorter range contributions from excluded states defined by Q=1-P and be scaled by the unknown and relatively small fraction of the wave function contained in P. In this presentation, we describe the formal construction of the shell model as an effective theory along with answers for the renormalization of operators to account for contributions of parts of the wave function outside P and the wave function normalization. The underlying effective interaction can be expressed as an expansion whose LECs can be constrained by observables such as scattering phase shifts and binding energies, or the spectrum of two nucleons in a periodic volume as comes from LQCD calculations.

Speaker: Kenneth McElvain

Slides 316-0-2-mcelvain_CIPANP18-NFS-P7.pdf

243 Effective-Field-Theory Extrapolations of Lattice-QCD Predictions for Light Nuclei

I will present work which utilizes few-nucleon observables, predicted with the lattice technique from quantum chromodynamics, to calibrate an effective interaction theory for nucleons (the pionless effective field theory) in order to assess the sensitivity of larger nuclei, their ground-state and scattering properties and electromagnetic responses, with respect to the unphysical changes in the lattice formulation of QCD — the large quark/pion masses, in particular. The presentation will include our latest investigations on multi-neutron cluster and the mass gap as represented by the five-nucleon system.

Speaker: Dr Johannes Kirscher (The City College of New York)

Slides 296-0-joki_BIRCH_DESERT_18.pdf

244 New Developments in Lattice Effective Field Theory

I discuss new progress in performing first principles lattice simulations of nuclear systems using the framework of effective field theory. Some of the topics to be covered are the connections between bare nuclear forces and nuclear structure and a new algorithm for studying the thermodynamics and spectra of nuclei.

Speaker: Prof. Dean Lee (Michigan State University)

Slides 72-0-DLee_CIPANP2018.pdf

Parton and Gluon Distributions in Nucleons and Nuclei: Parallel 7 — Unpolarized PDFs

Convener: Dr Ralf Seidl (RIKEN)

245 Unpolarised Parton Distribution Functions Today: Needs, Achievements and Challenges

I review recent progress in the determination of the unpolarised parton distribution functions (PDFs) of the proton. I focus on how the needs for accuracy and precision in current and future programs at high-energy accelerators are addressed in contemporary PDF sets. I discuss the impact on PDFs of the uncertainties coming from the data, the theory and the methodology, and I outline some corresponding challenges in their assessment.

Speaker: Dr Emanuele Roberto Nocera (Higgs Centre for Theoretical Physics)

Slides 5-0-NOCERA_CIPANP_PDFs.pdf

246 Parton Distribution Functions with Intrinsic Charm and Other News from CTEQ

We investigate the possibility of a (sizable) nonperturbative contribution to the charm parton distribution function (PDF) in a nucleon, theoretical issues arising in its interpretation, and its potential impact on LHC scattering processes. We discuss separation of the universal component of the nonperturbative charm from the rest of the radiative contributions and estimate its magnitude in the CTEQ global QCD analysis at the next-to-next-to leading order in the QCD coupling strength, including the latest experimental data from HERA and the Large Hadron Collider.

Speaker: Dr Marco Guzzi (Kennesaw State University)

Slides 181-0-guzzi-cipanp2018.pptx

247 Probing the Nucleon and Nucleus Structures with Drell-Yan Process Induced by a 120 GeV/c Proton Beam

To investigate the sea-quark asymmetry of the proton, the SeaQuest experiment at Fermilab uses a proton beam of 120 GeV/c interacting with liquid Hydrogen or Deuterium. Alongside of that the SeaQuest also probes the quark energy loss and EMC effect using targets of Iron, Carbon and Tungsten. Data taking ended in July of 2017, having recorded dimuon events from $1.4 \times 10^{18}$ protons interacting with various targets. A preliminary result of extracting sea-quark asymmetry will be given in this presentation. Progress in understanding quark energy loss and the nuclear EMC effect will also be presented.

Speaker: Dr Paul E Reimer (Argonne National Laboratory)

Slides 204-0-201805ReimerSeaQuestCIPANP.pdf

248 Electroweak, Jet and Heavy Flavor Probes in Proton-Lead Collisions at the LHC

Measurements of isolated prompt photon, massive electroweak boson, and jet production in small collision systems are of great interest to understanding the partonic structure of heavy nuclei, and serve as a constraint on the initial state in larger collision systems. These channels are sensitive to a variety of effects such as the modification of the parton densities in nuclei, including the possible onset of non-linear QCD effects in certain kinematic regions, and the energy loss of partons as they undergo multiple interactions in the nucleus before the hard parton-parton scattering. High-statistics samples of proton–lead collision data at $\sqrt{s_{_\mathrm{NN}}}=5.02$ TeV and 8.16 TeV taken in 2016, as well as proton–proton comparison data at analogous collision energies, allow for a detailed study of these phenomena in data and comprehensive comparisons to the predictions of a variety of theoretical approaches. This talk presents the latest ATLAS and CMS results in these and other topics, including new results from Run 2 proton–lead collisions on inclusive prompt photon production over a broad kinematic range, and angular correlations of forward dijets intended to probe the small-$x$ region. Results will also be shown on yields and two-particle correlations involving open and closed heavy flavor mesons, both measured directly and through their semileptonic decays, to study energy loss and transport properties of heavy quarks in the QGP.

Speaker: Dr Soumya Mohapatra (Columbia University)

Slides 110-0-CIPANP_1_.pdf

Precision Physics at High Intensities: Parallel 7 — Muons and Electrons

Convener: Renee Fatemi (University of Kentucky)

249 Probing BSM and High-$x$ Physics with SoLID at JLab

The SoLID spectrometer is being designed at JLab in order to provide a high luminosity and high-acceptance device for studies of parity-violation in deep inelastic scattering (PVDIS). The PVDIS studies will measure the vector-electron and axial-quark coupling, which is small in the Standard Model and thus provides a good test of BSM physics. In addition, the method provides a unique way to measure physics at large Bjorken $x$. Charge symmetry violation can be isolated with a deuterium target and an isovector EMC effect can be studied in a neutron-rich nucleus such as $^{48}$Ca. In addition, quark-quark correlations can be isolated in higher-twist effects. With a proton target, the $d/u$ PDF ratio can be measured directly without making corrections for nuclear targets. These topics will be reviewed in the context of recent theoretical and experimental developments.

Speaker: Paul Souder (Syracuse University)

Slides 172-0-CIPANP_2018_Souder.pdf

250 Physics with Electroweak Probes at the Electron-Ion Collider

The Electron-Ion Collider (EIC) will be the first facility to collide spin-polarized electrons with polarized protons, polarized light ions, and unpolarized heavy ions at high luminosity. Using the Standard Model electroweak interactions, the EIC will provide unprecedented insights into the structure of nucleons and nuclei and the partonic dynamics inside them. In addition, it will allow for precisely measuring parameters of the electroweak Standard Model itself. Finally, the EIC will open up possibilities to look for rare phenomena beyond the Standard Model complementary to the LHC and fixed target experiments around the world. This talk discusses the capabilities of experiments at the EIC to constrain nucleon structure functions using deep inelastic scattering meditated by $W$ and $Z$ bosons, to measure the weak mixing angle in a new kinematics range, and to search for electron-to-tau charged lepton flavor violation.

Speaker: Dr Nils Feege (Stony Brook University)

Slides 222-0-nfeege_CIPANP_2018_06_01_ElectroWeakProbes.pdf

251 Latest Updates from the AlCap Experiment

The AlCap experiment is a joint venture between the COMET and Mu2e collaborations to measure the rate and spectrum of particles emitted after nuclear muon capture on aluminium. Both collaborations will search for the charged lepton flavour violating process of neutrinoless muon-to-electron conversion by stopping muons in an aluminium target and so knowledge of other particles emitted during this process is important. The AlCap charged particle emission data was collected at the Paul Scherrer Institut in Switzerland over two runs in 2013 and 2015. In this talk, the experiment will be described and results will be presented.

Speaker: Andrew Edmonds

Slides 174-0-main.pdf

252 Muon Capture as a Probe of the Weak Axial Current

Muon capture provides a powerful tool to study the properties and structure of the nucleon and few nucleon systems predicted by chiral effective theories founded on Quantum Chromodynamics. Our program focuses on capture from the simplest of all muonic atoms, muonic hydrogen (MuCap experiment) as well as muonic deuterium (MuSun experiment), by using a novel active target method based on the development of high pressure time projection chambers filled with hydrogen/deuterium gas. In this contribution we discuss two applications. $\textit{Nucleon axial radius and muonic hydrogen}$. In a recent review [1] the model independent re-evaluation [2] of the axial radius squared $r_A^2(z\ \mathrm{exp.}) = 0.46(22)$ fm$^2$ from $\nu d$ scattering and the muon capture rate in hydrogen measured in MuCap was used to update the value of the induced pseudoscalar form factor $g_P$ and, alternatively, to determine an independent $r_A^2(\mathrm{MuCap})=0.46(24)$ fm$^2$ from muon capture. $\textit{MuSun and astrophysics neutrino reaction.}$ The precision measurement of the capture rate for $\mu d \to n n \nu$ in MuSun will determine a critical low-energy constant in effective field theories, required for the calculation of fundamental astrophysics reactions like solar $pp$ fusion and $\nu d$ scattering at SNO. Data taking of the experiment was successfully concluded and the analysis is in an advanced state. [1] Richard J Hill et al, Rep. Prog. Phys. in press (2018), http://iopscience.iop.org/article/10.1088/1361-6633/aac190 [2] A.S. Meyer et al, Phys.Rev. D 93, 113015 (2016)

Speaker: Prof. Peter Kammel (CENPA, UW Seattle)

Slides 308-0-MuonCapture_Kammel.pptx

253 Antimatter Gravity with Muonium

The gravitational acceleration of antimatter, $\bar g$, has yet to be directly measured; an unexpected outcome of its measurement could change our understanding of gravity, the universe, and the possibility of a fifth force. Three avenues are apparent for such a measurement: antihydrogen, positronium, and muonium, the last requiring a precision atom interferometer and novel muonium beam under development. The interferometer and its few-picometer alignment and calibration systems appear feasible. With 100 nm grating pitch, measurements of $\bar g$ to 10%, 1%, or better can be envisioned. These could constitute the first gravitational measurements of leptonic matter, of 2nd-generation matter, and possibly, of antimatter.

Speaker: Prof. Daniel Kaplan (Illinois Institute of Technology)

Slides 352-0-Kaplan_Muonium_Gravity_Talk-CIPANP-6-18-R1.pdf

TSEI / PHE: Parallel 7 — Weak Parameters

Conveners: Mr Kent Paschke (University of Virginia), Prof. Stefania Gori (University of Cincinnati)

254 Review of the First $W$ Boson Mass Measurement with the ATLAS Detector

A precise measurement of the $W$ boson mass represents an important milestone to test the overall consistency of the Standard Model. Since the discovery of a Higgs Boson, the $W$ boson mass is predicted to 7 MeV precision, while the world average of all measurements is 15 MeV, making the improved measurement an important goal. Large samples of leptonic decays of $W$ and $Z$ bosons were collected by the ATLAS detector with efficient single lepton triggers in the 7 TeV data set corresponding to an integrated luminosity of 4.6 fb$^{-1}$. With these samples the detector and physics modelling has been studied in great detail and enabled a $W$ boson mass measurement with a precision of 19 MeV, which will be presented in this talk. Special focus will be drawn on the modeling of the production processes of $W$ bosons in proton-proton collisions, that are crucial for this measurement.

Speaker: Fabrice Balli (CEA Saclay)

Slides 109-0-CIPANP2018FBALLI.pdf

255 The Weak Charge: From Atoms to the Z-Pole

I review the status of theoretical calculations that empower the precise determination of the weak mixing angle across the whole range of currently accessible energies. The key ingredients include the EW running of $\sin^2\theta_W$, and applications of the dispersion relations to radiative corrections that involve effects of the strong interaction. The upcoming low-energy experiments with polarized electrons will be sensitive to a wide range of New Physics, heavy and light, thus complementing collider searches.

Speaker: Dr Mikhail Gorshteyn (University of Mainz)

Slides 377-0-Gorshteyn_Weak_Charge_CIPANP2018.pdf

256 Prospects for New Atomic Parity Violation Experiments

Low-energy precision tests of electro-weak physics keep playing an essential role in the search for new physics beyond the Standard Model. Atomic parity violation (APV) experiments measure the strength of highly forbidden atomic transitions induced by the exchange of $Z$ bosons between electrons and quarks in heavy atoms. APV is sensitive to additional interactions such as leptoquarks, and provides complementary sensitivity to weak, parity-violating electron-quark couplings relative to parity-violating electron scattering. Our group is working towards a measurement in francium, the heaviest alkali, where the APV signal is about 18 times larger than in cesium. Since francium has no stable isotopes, we have established an online laser trap at the ISAC radioactive beam facility at TRIUMF that can confine millions of cold francium atoms at micro-Kelvin temperatures in a volume of approximately 1 cubic mm, an ideal environment for precision spectroscopy. I will report on our first observation of the E1-forbidden 7s–8s transition, and discuss the prospects for improved APV measurements in francium and in general.

Speaker: Gerald Gwinner (University of Manitoba)

Slides 280-0-gwinner_201806_CIPANP.pdf

257 Parity Violating Electron Scattering Experiments for an Ultra Precise Determination of the Weak Mixing Angle at Low Energies

Parity violating electron scattering off unpolarised electrons or unpolarised protons at low momentums transfer (well below Z-pole) is an ideal tool to test the Standard Model and search for BSM-physics up to a mass scale of about 50 TeV, complementary to the new physics searches at high energies at the LHC. The future MOLLER experiment at JLab and the future P2 experiment at the upcoming MESA facility in Mainz are designed to reach an accuracy of order per mille in the measurement of the weak mixing angle and are sensitive to partly different Standard Model extensions. Both experiments and their prospective physics reach will be discussed.

Speaker: Prof. Frank Maas (Helmholtz Institute Mainz)

Slides 367-0-Maas_P2_MOLLER_CIPANP_2018.pdf

258 High Precision Extraction of $A_{FB}$ at the LHC

We report on the extraction of the electroweak mixing angle from precision measurements of the forward-backward asymmetry ($A_{FB}$) in dilepton events produced at the large hadron collider.

Speaker: Prof. Arie Bodek (University of Rochester)

Slides 365-0-Mixing_angle-Bodek-CIPANP-2018.pdf

15:40 Break

NMNM / TSEI: Parallel 8 — Neutrinos and Symmetries

Conveners: Prof. Andre de Gouvea (Northwestern University), Brad Filippone (caltech), Daniel Dwyer

259 Sterile Neutrinos in the Early Universe

I will give an overview of sterile neutrino physics in the early universe and in cosmology, especially as regards dark matter. This will include a discussion of production mechanisms, relic densities, the relationship of these to lepton and baryon numbers, and associated high energy scale physics issues. I will also discuss the status of X-ray observational constraints on sterile neutrino and other light dark matter, dark matter candidates.

Speaker: Prof. George Fuller (University of California, San Diego)

260 Non-Standard Neutrino Interactions

I discuss the status of non-standard neutrino interactions, especially their impact on next-generation neutrino oscillation experiments.

Speaker: Prof. Andre de Gouvea (Northwestern University)

261 Detecting CP Violation in the Presence of Non-Standard Neutrino Interactions

New physics beyond the Standard Model could appear at long baseline oscillation experiments as non-standard interactions (NSI) between neutrinos and matter. If so, determination of the CP-violating phase $\delta_{13}$ is ambiguous due to interference with additional complex phases. I'll present my work using both numerical solutions and a perturbative approach to study oscillation probabilities in the presence of NSI. I'll show how the CP phase degeneracies are visualized on biprobability plots, and the extent to which the energy spectrum for a given baseline length can help resolve them.

Speaker: Jeffrey Hyde (Goucher College)

262 Neutrino Oscillations and Supernova Nucleosynthesis

A good fraction of the heavier nuclei were formed in the rapid neutron capture (r-process) nucleosynthesis scenario. Although an astrophysical site of the r-process is not yet identified, one expects such sites to be associated with explosive phenomena since a large number of interactions are required to take place during a rather short time interval. Candidate sites include core-collapse supernovae and neutron-star mergers. The dynamics of these sites very much depend on neutrinos. In particular, the sheer number of neutrinos produced give rise to collective neutrino oscillations. Collective oscillations of neutrinos represent emergent nonlinear flavor evolution phenomena instigated by neutrino-neutrino interactions in astrophysical environments with sufficiently high neutrino densities. In this talk the connection between neutrino collective oscillations, the dynamics of core-collapse supernovae, and the origin of chemical elements, especially those produced by the r-process nucleosynthesis, will be discussed.

Speaker: Prof. Akif Baha Balantekin (University of Wisconsin-Madison)

Slides 217-0-CIPANP_Balantekin.pdf

263 Collective Neutrino Oscillations in the Presence of Collisions

In dense astrophysical environments, the evolution of neutrino flavor is non-linear which can lead to many interesting phenomena. However, this non-linear evolution of neutrino flavor also called the "collective neutrino oscillations" is only beginning to be understood, especially in conjunction with collisions. I will discuss the effect of neutrino back-scattering in the interior of a core-collapse supernova using a simplified model.

Speaker: Dr Shashank Shalgar (Los Alamos National Laboratory)

Slides 151-0-halo.pdf

264 Neutrino Flavor Transformation and the Cosmic Lepton Asymmetry

Observational constraints permit a cosmic lepton asymmetry that is orders of magnitude larger than its baryonic counterpart, a possibility of great relevance for leptogenesis, sterile neutrino dark matter, and the flavor evolution of Standard Model neutrinos. It is this last connection that we focus on here: the flavor states of neutrinos in the early universe are coupled to each other, through neutrino-neutrino forward scattering, in a way that depends on the lepton asymmetry. We identify the regimes of flavor transformation that are permitted by constraints and discuss possible ramifications for Big Bang nucleosynthesis. Incidentally, the regime preferred by resonant production of sterile neutrino dark matter is marked by a new flavor-transformation phenomenon, which we analogize to the real-life toy known as a rattleback.

Speaker: Luke Johns (UC San Diego)

Slides 340-0-CIPANP_talk.pptx 340-1-CIPANP_talk.pdf

Nuclear Forces and Structure, NN Correlations, and Medium Effects: Parallel 8 — Ab Initio Forces, Models, and Nuclei at Weak Binding

Convener: Prof. Bradley Sherrill (Michigan State University)

265 Current Status of Nuclear Forces from Chiral EFT

Nuclear forces derived in chiral EFT are nowadays extensively used to study low-energy reactions and to describe various properties of nuclei and nuclear matter. I review the current status of the theory and describe our recent efforts towards developing this theoretical approach into a precision tool. Topics addressed include the two- and three-nucleon forces, applications to light systems and uncertainty quantification.

Speaker: Prof. Evgeny Epelbaum (Ruhr-University Bochum)

Slides 92-0-CIPANP_Epelbaum_final_public.pdf

266 Microscopic Shell Model Interactions and Effective Operators

As experimental efforts have shifted towards the study of rare isotopes, the predictive power of the wildly successful (but heretofore phenomenological) nuclear shell model is challenged by the scarcity of nearby data to constrain its parameters. Therefore, the ability to reliably calculate these parameters directly from the underlying nuclear forces, and relying less on experimental data, becomes increasingly urgent as we move away from stable nuclei. In this talk, I summarize recent progress towards this goal using the in-medium similarity renormalization group (IM-SRG) to construct microscopic shell model interactions and effective operators starting from the underlying inter-nucleon forces and currents.

Speaker: Scott Bogner (Michigan State University)

Slides 342-0-Bogner_CIPANP2018.key

267 Experimental Tests of Ab Initio Calculations of Nuclear Structure

Ab Initio or first-principle methods have been very successful in calculating many properties of light nuclei. These methods use the most modern formulations of two- and three-nucleon interactions and have provided very accurate reproductions of the binding energies and level spectra for light nuclei over the past several years. These approaches have also been used to predict other properties, such as spectroscopic overlaps, nucleon densities and correlations, and electro-magnetic transition rates. In some cases, the agreement between theory and experiment has been less good, with notable discrepancies between data and predictions. I will describe two very different experiments that provide varied data that may be compared to predictions from Quantum Monte Carlo calculations. The first involves the Z dependence of E2 electro-magnetic transition rates in the T=1 ($^{10}$C,$^{10}$B,$^{10}$Be) triplet. The second example concerns spectroscopic overlaps and two-neutron densities in the so-called “super-heavy” isotope of hydrogen $^5$H, studied by proton removal with the $^6$He(d,$^3$He)$^5$H reaction at the National Superconducting Cyclotron Laboratory at Michigan State University.

Speaker: Prof. Alan Wuosmaa (University of Connecticut)

Slides 106-0-CIPANP_2018_Wuosmaa.pdf

268 Current Status of Very-Large-Basis Hamiltonian Diagonalizations for Nuclear Physics

Today there are a plethora of many-body techniques for calculating nuclear wave functions and matrix elements. I will review the status of that reliable workhorse, the interacting shell model, a.k.a. configuration-interaction methods, a.k.a. Hamiltonian diagonalization, and survey its advantages and disadvantages. With modern supercomputers one can tackle dimensions up to about 20 billion! I will discuss prospects for going even further, and what one hopes to learn.

Speaker: Prof. Calvin Johnson (San Diego State University)

Slides 341-0-Johnson_CIPANP_2018.pdf

269 Prospects for ab-initio Calculations of Nuclei with Quantum Computing

In this talk, we report on the first nuclear physics computations performed on quantum computers. Addressing superconducting qubits provided by IBM and Rigetti via cloud servers, we calculate the binding energy of the deuteron to within a few percents. This is achieved by implementing the hybrid classical-quantum variational eigensolver algorithm with a low-depth version of the unitary coupled-cluster ansatz. I will discuss our results, experience, and future directions within the context of the near term noisy quantum computing paradigm.

Speaker: Dr Eugene Dumitrescu (ORNL)

Slides 317-0-CIPANP18_EFD_full.pdf

270 Weakly Bound Neutron-Rich Nuclei and Cosmic Phenomena

Understanding the limits of existence of nuclei is an open problem in fundamental science. Lack of understanding of the nucleon-nucleon interaction in nuclei with unusual neutron to proton ratio is one of the main reasons. Thus it is an urgent problem to find out the missing link of unified theory by studying single particle and bulk properties of the nuclei with large neutron proton asymmetry. The shell gaps at magic numbers are the characteristics of a mean nuclear field. The unambiguous information on detailed components of the ground-state wave-function along with quantum numbers of the valence neutron of the nuclei can be obtained from the measurement of threshold strength along with the $\gamma$-ray spectra following Coulomb breakup. The shape of this threshold strength is a finger-print of the quantum numbers of the nucleon. We investigated the ground-state properties of neutron-rich Na, Mg, Al nuclei around $N\sim 20$ using this method at GSI, Darmstadt. Very clear evidences have been observed for melting and merging of long cherished magic shell gaps at $N=20, 28$. The nuclei around the drip-line are short-lived but surprisingly, evanescent rare isotopes imprint their existence in stellar explosive scenarios (r-process etc.). Due to their fleeting existence, indirect measurements are often the only possible access to the information which is a valuable input to the model for star evaluation process. Some valuable bulk properties of the neutron-rich nuclei play a key role in understanding cosmic phenomena. I shall discuss in this presentation our achievements related to the above mentioned facts.

Speaker: Prof. Ushasi Datta (Saha Institute Of Nuclear Physics)

Slides 278-0-CIPANP2018_ushasi.pdf

Particle and Nuclear Astrophysics: Parallel 8 — Neutron Stars

Conveners: Dr Barry Davids (TRIUMF), Wick Haxton

271 Sites of the r-process: supernovae and mergers: Recent Successes and Current Issues

Many of the heavy elements in the universe are produced through the rapid capture of neutrons onto iron peak elements, the so-called r-process. Sites for this crucial heavy element production are necessarily extreme and leading proposals invoke conditions at the heart of the engines behind supernovae and gamma-ray bursts. These models include neutrino-driven winds, magnetically-contained winds, magnetically-driven outflows, and disk winds around a collapsed star as well as the winds and dynamical ejecta from the merger of two neutron stars or a neutron star and a black hole. Here we review these sites, their successes and problems in an effort to gain a more complete picture of the production of the heavy elements made in the r-process.

Speaker: Chris Fryer (Los Alamos National Laboratory)

Slides 247-0-CIPANPFryer.pptx

272 Properties of the Binary Neutron Star Merger GW170817

Observations of binary neutron star mergers such as GW170817 by the LIGO and Virgo gravitational-wave detectors provide unique ways of constraining the equation of state through tidal interactions and potential observations of a post-merger signal. In this work we improve initial estimates of the parameters of GW170817 using the known source location, improved waveform modeling, additional data down to 23 Hz compared to the 30 Hz in the initial analysis, and re-calibrated Virgo data. We compare results inferred using several waveform models which incorporate additional physical effects as compared to the initial TaylorF2 waveform reported with the discovery of GW170817. These effects include precession, the spin induced quadrupole moment, and tidal effects calibrated with numerical simulations. We report updated constraints on the masses, spins, and tidal parameters, and compare these results to predictions from various equation of state models. Finally, we perform an unmodeled Bayesian analysis to place upper limits on the amplitude and spectral energy density of the unobserved post-merger signal.

Speaker: Dr Benjamin Lackey (Max Planck Institute for Gravitational Physics)

Slides 176-0-PEPaper.pdf

273 Numerical Simulations of Neutron Star Mergers

The observation of gravitational waves and electromagnetic signals powered by the merger of two neutron stars has already provided us with a wealth of information about compact objects, high-energy astrophysics, and nuclear astrophysics. To extract as much information as possible from such observations, however, a deeper understanding of the highly non-linear merger events is necessary. Accurate studies of the merger of two neutron stars, or of a black hole and a neutron star, require complex numerical simulations capable of evolving Einstein’s equations of general relativity, and the general relativistic equations of magnetohydrodynamics and neutrino radiation transport. In this talk, I will review recent efforts to improve the accuracy and physical realism of these simulations. I will discuss our current ability to model the properties of observable gravitational wave and electromagnetic signals, as well as important limitations of existing simulations that may still affect our ability to reliably extract information from some of these signals.

Speaker: Prof. Francois Foucart (University of New Hampshire)

Slides 177-0-Foucart-CIPANP.pdf

274 Applications of Chiral Forces to Nuclear Matter and Neutron Stars

The equation of state of (isospin-)asymmetric nuclear matter is a key quantity for nuclear astrophysics. In this talk, we discuss recent progress of microscopic calculations based on nuclear forces derived within chiral effective field theory and many-body perturbation theory. We focus in particular on applications of our improved normal-ordering method which enables the treatment of general three-body (3N) interactions starting from a partial-wave-decomposed form. Specifically, chiral 3N forces up to next-to-next-to-next-to-leading order (N$^3$LO) are now accessible in partial-wave based frameworks. Applying these density-dependent effective two-body potentials to matter of arbitrary proton fractions, we show results for the equation of state, symmetry energy, incompressibility in conjugation with empirical parametrizations including the quadratic expansion in isospin-asymmetry. Furthermore, we elaborate on constructing equations of state up to the high central densities typically realized in neutron stars. These can then be used to constrain, e.g., mass-radius relations. Remarkably tight constraints have been obtained with our state-of-the-art equations of state.

Speaker: Dr Christian Drischler (University of California, Berkeley and Lawrence Berkeley National Laboratory)

Slides 167-0-2018_Drischler_Appl_EFT_neutron_stars_slides.pdf

275 Studying Lanthanide Production in r-Process Nucleosynthesis

The recent observations of the GW170817 electromagnetic counterpart suggest lanthanides were produced in this neutron star merger event. Lanthanide production in heavy element nucleosynthesis is subject to large uncertainties from nuclear physics and astrophysics unknowns. Specifically, the rare-earth abundance peak, a feature of enhanced lanthanide production at $A\sim164$ seen in the solar r-process residuals, is not robustly produced in r-process calculations when astrophysical and nuclear physics inputs are varied. One possibility which will be discussed is that the fission fragment distributions of heavy, neutron-rich nuclei dump material directly into the peak region at late times. Alternatively, the proposed dynamical mechanism of peak formation requires the r-process path to encounter a nuclear physics feature in the rare-earth region which may be within reach of nuclear physics experiments performed at, for example, the CPT at CARIBU and the upcoming FRIB. To maximize what can be learned regarding nucleosynthesis from such precision measurements, we employ Markov Chain Monte Carlo studies to "reverse engineer" the nuclear masses capable of producing a peak compatible with the observed solar r-process abundances given different sets of astrophysical conditions. Here I will present the latest results for the masses found to produce the rare-earth peak in a low entropy accretion disk wind scenario, and compare directly with recent mass measurements from the CPT at CARIBU. Such collaborative efforts between theory and experiment could soon be in a position to make definitive statements regarding the mechanism of rare-earth peak formation and thus the astrophysical site of the r-process.

Speaker: Dr Nicole Vassh (University of Notre Dame)

Slides 305-0-NVassh_CIPANP_2018.pptx 305-1-NVassh_CIPANP_2018.pdf

276 R-Process Experiments with Unstable Isotope Beams

The measurement of elemental abundances in ultra-metal poor stars over the last decade, and the recent observation of a neutron-star merger event, are crucial steps towards solving one of the outstanding questions in nuclear astrophysics: the synthesis of the heaviest elements during the rapid neutron-capture process (r-process). However, and in spite of steady progress in the experimental and theoretical fronts, the lack of reliable nuclear data for most isotopes involved in the r-process still represents a significant hurdle to make precise comparisons of astrophysical theories with astronomical observations. Improving nuclear data for the r-process is one of the main motivations for the development of a new generation of radioactive ion beam laboratories specifically designed to be able to reach very unstable isotopes. I will review current efforts on r-process experiments with radioactive ion beams, discussing examples of measurements of nuclear masses and decay properties of neutron-rich isotopes at the National Superconducting Cyclotron Laboratory (NSCL) in the US, and the Radioactive Ion Beam Factory (RIBF) of RIKEN in Japan, which our group is involved with. I will also present an outlook of the exciting new experimental opportunities that will be offered by the Facility for Rare Isotope Beams (FRIB) under development at Michigan State University.

Speaker: Alfredo Estrade (Central Michigan University)

Slides 173-0-estrade_cipanp18.pdf

Parton and Gluon Distributions in Nucleons and Nuclei: Parallel 8 — Transverse Spin Structure and Fragmentation

Convener: Dr Ralf Seidl (RIKEN)

277 TMDs - Transverse Connections Between Nuclear and Particle Physics

Uncertainties generated by our ignorance of hadronic structure hamper precision calculations for high-energy scattering processes. Transverse-momentum-dependent (TMD) distributions give a quantitative representation of hadronic structure in a three-dimensional momentum space and encode all the possible spin and momentum correlations between a hadron and its constituents. Extractions of TMDs from hard scattering experiments rely both on the availability of multi-dimensional data sets and on the applicability of the TMD formalism. In this talk I will report about recent progress in the formalism that can have an impact on the phenomenology of TMD distributions. In particular, I will discuss which kinematic regions are most sensitive to the nonperturbative structure of the TMDs and which current and future experiments can provide data in these regions. I will also discuss how to access quark and gluon TMD distribution and fragmentation functions in specific scattering processes and, finally, investigate what is the expected impact of TMDs on very high energy scattering processes, such as $W$ boson production at the Large Hadron Collider.

Speaker: Dr Andrea Signori (Jefferson Lab)

Slides 17-0-Signori_CIPANP_2018.pdf

278 Transverse Spin Related Measurements at RHIC

The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory is the world's only polarized proton collider with center-of-mass energies up to 500 GeV and beam polarizations of about 60% at the highest energies. It provides unique opportunities to study the spin structure in hadronic systems and opens new kinematic regions compared to deep inelastic scattering experiments. Transverse spin effects have been among the most surprising discoveries in nuclear physics and they are an essential tool in order to separate the intrinsic properties of hadrons from interaction dependent dynamics in the framework of QCD factorization. This talk will discuss the latest achievements from the RHIC experiments related to nuclear spin orbit correlations and spin dependent fragmentation functions, universality of transverse momentum dependent distribution functions, and results from proton-nucleon collisions.

Speaker: Oleg Eyser (Brookhaven National Laboratory)

Slides 108-0-2018-06-01_TransverseRHIC.pdf

279 Transverse Momentum Distributions: Recent News from HERMES and COMPASS

Transverse momentum dependent distribution functions offer deep insights into the quark and gluon structure of the nucleon. Measuring asymmetries in Semi-Inclusive Deep Inelastic Scattering (SIDIS) of charged leptons off longitudinally and transversely polarised nucleons offers access to a variety of transverse momentum dependent distribution functions (TMD). The HERMES and COMPASS experiments are providing SIDIS asymmetries observed in meson-electroproduction off polarised protons and neutrons, establishing the underlying reaction mechanism and providing constraints and input to the modelling of TMDs. The presentation will present and review the latest results from these experiments.

Speaker: Dr Bjoern Seitz (University of Glasgow)

Slides 348-0-CIPANP_2018_HERMES_SIDIS_BSeitz.pdf

280 First Extraction of Transversity from Data on Lepton-Hadron Scattering and Hadronic Collisions

We present the first extraction of the transversity distribution in the framework of collinear factorization based on the global analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets and in proton-proton collisions with one transversely polarized proton. The extraction relies on the knowledge of dihadron fragmentation functions, which are taken from the analysis of electron-positron annihilation data. For the first time, the chiral-odd transversity is extracted from a global analysis similar to what is usually done for the chiral-even spin averaged and helicity distributions. The knowledge of transversity is important for detecting possible signals of new physics in high-precision low-energy experiments.

Speaker: Prof. Marco Radici (INFN - Sezione di Pavia)

Slides 127-0-radici.pdf

281 Light Quark Fragmentation Studies at the B-Factories

The first generation B-factories Belle and Babar, located at KEK and SLAC, respectively, took $e^+e^-$ annihilation data mostly near the $\Upsilon$(4S) resonance. Due to the size of the datasets, Belle sampled a record breaking 1 ab$^{-1}$, BaBar about half that, as well as the precision instrumentation and PID capabilities, these facilities have been an indispensable tool for the precision study of fragmentation functions. Using data collected by Belle and BaBar, fragmentation functions can be extracted independently of the nucleon structure that has to be considered when analyzing data from deep-inelastic scattering or hadronic collisions. This is in particular valuable to determine the polarization dependence as well as transverse momentum dependence of fragmentation functions which are convoluted with poorly known quantities in SIDIS and hadronic collisions. Most recently, Belle performed precision measurements of di-hadron production as well as the first observation of transversely polarized hyperons in electron-positron annihilation. Beyond determining Fragmentation Functions, the study of hadronization allows us access to perturbative and non-perturbative QCD effects. This talk will present the latest results from the ongoing program of hadronization studies at Belle and BaBar. It will also give an outlook towards related physics opportunities at Belle II, which will start data taking this year, sampling about 40 times the luminosity that Belle did.

Speaker: Anselm Vossen (Duke University/JLab)

Slides 142-0-CIPANP2018_FFsVossen.pdf

282 Achievements and Open Issues in the Determination of Fragmentation Functions

I review recent progress in the determination of the collinear fragmentation functions (FFs). I focus on the role of new data, improved theory and increased methodological sophistication in recent global QCD fits of light charged hadron FFs. I outline issues that are still open, and I discuss possible ways to assess the interplay between FFs and parton distribution functions (PDFs) in semi-inclusive observables.

Speaker: Dr Emanuele Roberto Nocera (Higgs Centre for Theoretical Physics)

Slides 232-0-NOCERA_CIPANP_FFs.pdf

QCD, Hadron Spectroscopy, and Exotics: Parallel 8 — Light Spectroscopy | Perturbative QCD

Convener: Dr Seamus Riordan (Argonne National Laboratory)

283 Analysis of $\eta\pi^0$ and $\eta^{^{_/}}\pi^0$ Systems at GlueX

The GlueX experiment at Jefferson Lab aims to study the light-quark meson spectrum with an emphasis on the search for hybrid mesons. The $\eta\pi^0$ and $\eta^{^{_/}}\pi^0$ final states are promising channels for this search. Several experiments have observed a contribution with exotic quantum numbers in these channels in the past, but the resonance interpretation is not well established. GlueX will contribute significant complementary information to this discussion by studying the production with a polarized 9 GeV photon beam. The comparison between both channels can shed light on the nature of the exotic mesons, in particular their flavor content. We will present preliminary results obtained from an initial dataset recorded in 2017.

Speaker: Dr Alexander Austregesilo (Jefferson Lab)

Slides 158-0-Austregesilo_Cipanp2018.pdf

284 Toward Precise Determination of Resonant Hadron Scattering Amplitudes from Lattice QCD

Given recent progress in the determination of scattering amplitudes from lattice QCD calculations, systematic errors due to the finite lattice spacing and simulation volume must now be controlled in order to provide quantitative QCD predictions for the properties of excited hadrons. To this end, I will present a calculation of the pion-pion scattering amplitude near the $\rho$(770) resonance, as well as the corresponding isovector timelike pion form factor, in which a complete systematic study is performed. Ongoing calculations of amplitudes containing the $K^*$(892), $\Delta$(1232), and $\Lambda$(1405) resonances will also be presented.

Speaker: Prof. John Bulava (CP3-Origins, U. of Southern Denmark)

Slides 80-0-bulava_cipanp.pdf

285 A Lattice QCD Study of the $\rho$ Resonance

We present a lattice QCD study of the $\rho$ resonance with $N_f=2+1$ clover fermions at a pion mass of approximately 320 MeV and lattice size 3.6 fm. We study two processes involving the $\rho$. The first process is scattering of two pions in P-wave with isospin 1 where by using the Luescher method we determine the strong scattering phase shift, from which we determine the $\rho$ resonance mass and decay width $\Gamma(\rho \to \pi\pi)$. The second process is the radiative transition $\pi\gamma \to \pi\pi$ where we follow the Briceno-Hansen-Walker-Loud approach to determine the radiative transition amplitude in the invariant mass region near the $\rho$ resonance and both space- and time-like momentum transfer. This allows us to determine the coupling between the $\rho$, the pion and the photon and the $\rho$ radiative decay width.

Speaker: Dr Luka Leskovec (University of Arizona)

Slides 369-0-presentation.pdf

286 Measurement of Transition Form Factors at BESIII

The two-photon physics program of the BESIII Collaboration is mainly motivated by the large uncertainty of the contribution of hadronic light-by-light scattering (hLBL) to the Standard Model calculations of the anomalous magnetic moment of the muon $a_\mu$. Here, electromagnetic transition form factors (TFF) can serve as experimental input to improve the calculations. Data acquired with the BESIII detector at center of mass energies from 3.77 to 4.6 GeV allow one to study the momentum dependence of TFFs of light mesons. The measurements are performed with a single-tag technique and indicate an unprecedented accuracy at momentum transfers below 3 GeV$^2$, the region of highest importance for the calculations of $a_\mu$. In addition to the single pseudoscalar mesons $\pi^0, \eta$ and $\eta^{^{_/}}$, the $\pi\pi$ system is studied. The information is not only vital as input to the recently developed dispersive approaches to the hLBL calculations, but allows one to investigate TFFs of scalar and tensor resonances, and can provide further insights on the pion polarizabilities, as well as pion rescattering effects. Making use of the large statistics collected at BESIII, a first double-tagged measurement of the pion transition form factor has been started. It is the first step towards a model independent parameterization of the TFF of the $\pi^0$. In this presentation the current status of the program will be discussed.

Speaker: Dr Christoph Florian Redmer (Institute for Nuclear Physics, Johannes Gutenberg-University Mainz)

Slides 290-0-CFR180601.pdf

287 Unitary Reaction Models and PWA Formalisms

Last decade witnessed a proliferation of new exotic states, in particular in the heavy quark sector. A comprehensive picture of all these states remains an unsettled topic. We discuss our recent developments in amplitude analysis, in particular related to the identification of exotic states.

Speaker: Dr Alessandro Pilloni (Jefferson Lab)

Slides 126-0-reaction.pdf

Quark Matter and High Energy Heavy Ion Collisions: Parallel 8 — Jet Substructure and Quenching / Flavor

Conveners: Prof. Jacquelyn Noronha-Hostler (Rutgers University), Marta Verweij (Vanderbilt University)

288 Jet Measurements in Heavy Ion Collisions

The Quark-Gluon Plasma (QGP) is created in high energy heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). This medium is transparent to electromagnetic probes but nearly opaque to colored probes. Hard partons produced early in the collision fragment and hadronize into a collimated spray of particles called a jet. The partons lose energy as they traverse the medium, a process called jet quenching. Most of the lost energy is still correlated with the parent parton, contributing to particle production at larger angles and lower momenta relative to the parent parton than in proton-proton collisions. This partonic energy loss can be measured through several observables, each of which give different insights into the degree and mechanism of energy loss. The measurements to date are summarized and the path forward is discussed.

Speaker: Dr Christine Nattrass (University of Tennessee, Knoxville)

Slides 237-0-NattrassCIPANP2018.pdf

289 The Theory of Jets in Dense Matter

The quenching of hard jets in relativistic heavy-ion collisions has become the leading probe of the properties of the Quark-Gluon-Plasma (QGP) formed in these collisions. Formed in rare hard interactions, jets traverse the entire space-time profile of the exploding plasma and are modified by it. The detailed study of these modifications reveals clues about the internal structure of the QGP. In this talk I will conduct a broad survey of the field of jet modification in dense matter, outlining the variety of observables that are now available and what can be discerned from these. I will also focus on the evolving technology of Monte-Carlo event generators and how these can become probing tools in the study of the QGP.

Speaker: Dr Abhijit Majumder (Wayne State University)

Slides 361-0-majumder-CIPANP-2018b.pdf

290 Using Photon-Jet Analyses to Probe the QGP

RHIC at Brookhaven National Laboratory has been providing high energy heavy-ion collisions since the year 2000. Hard probes are often analyzed to study the properties of the matter created in heavy-ion collisions, by comparing the measurements to those in $p+p$ collisions. Direct photons, those produced during the collision rather than from decays of hadrons, are particularly interesting because they do not interact strongly and thus are not affected significantly by the medium. With the photon energy as a good approximation for the initial energy of the recoil parton (before interaction with the medium), the study of direct-photon-triggered away-side jets can give information about the energy loss of the recoil parton while traversing through the medium. In addition, it is useful to compare the suppression of jet-associated yields for direct-photon and neutral-pion triggers, in order to analyze the path-length and color-factor dependence of parton energy loss. Correlation measurements of direct-photon+hadron and neutral-pion+hadron will be presented and discussed. The status of an analysis of neutral-triggered reconstructed jets will also be discussed.

Speaker: Prof. Saskia Mioduszewski (Texas A&M University)

Slides 269-0-GammaJet_CIPANP.pdf

291 Jet Mass for the Inclusive Jet Production at the LHC

In this talk, I will develop the theoretical framework of jet substructure measurements in the semi-inclusive jet production. The talk will mainly be focused on the recent work on jet mass measurements, with and without grooming, as a particular substructure of interest. I will discuss factorization, nonperturbative effects, and joint resummations of several classes of logarithmic corrections to all orders. Then I will discuss how both ungroomed and groomed results give very good agreement with the available data from the LHC.

Speaker: Kyle Lee (Stony Brook University)

Slides 37-0-CIPANP18_KyleLee.pdf

292 Heavy Flavor Jet Quenching at RHIC and LHC Energies

Heavy quarks serve as valuable probes of the QGP properties as well as the mass hierarchy of parton energy loss. In this talk, different model calculations of heavy quark energy loss inside the QGP are compared to each other within the same framework, from which we narrow down the systematical uncertainty of the extracted heavy quark transport coefficients from model to data comparison. In addition, a multi-stage evolution approach is introduced to heavy quark energy loss. This combines a rare-scattering multiple emission formalism at momenta large compared to the mass of heavy quarks and a single scattering induced emission formalism at momenta comparable to the mass. This new approach reduces the difference of energy loss between charm and beauty quarks and simultaneously describes the nuclear modification of $D$ and $B$ mesons.

Speaker: Shanshan Cao (Wayne State University)

Slides 240-0-Shanshan_-_CIPANP_2018.pptx

293 Energy and System Dependent Heavy Flavor Measurements at PHENIX at RHIC

Heavy flavor and quarkonium production are important hard probes to test Quantum Chromodynamics (QCD) and measure the properties of the Quark Gluon Plasma (QGP) created in high energy heavy ion collisions. Unlike LHC experiments, heavy flavor production at RHIC has its unique kinematic region and different production mechanisms. The PHENIX experiment has collected large data sets of 200/510 GeV $p$+$p$; 200 GeV $p$+Al, $p$+Au, Cu+Au and Au+Au collisions, which allow us to study the energy dependence of the heavy flavor production, the heavy quark energy loss in cold nuclear medium and hot QGP. In this talk, we will present latest PHENIX hidden and open heavy flavor results in different collision systems including the $J/\psi$ cross section and nuclear modification factor ($R_{AA}$) in 200 GeV $p$+Al, $p$+Au and $^3He$+Au data to study the cold nuclear medium effects on the charm quark production; the energy dependent production of forward $J/\psi$ from B meson decay and bottom cross section measured in $p$+$p$ collisions which improves the understanding of the heavy flavor production mechanism; the non-prompt $J/\psi$ nuclear modification factor measurement in Cu+Au collisions at $\sqrt{s_{NN}} = 200$ GeV and the charm and bottom decayed single electron nuclear modification factor measurements in 200 GeV Au+Au collisions. We will also show the prospects for ongoing PHENIX central and forward rapidity open heavy flavor measurements in 200 GeV Au+Au collisions.

Speaker: Dr Xuan Li (Los Alamos National Lab)

Slides 112-0-CIPANP2018_QMHI_HF_XuanLi_ver3.pdf

Poster Session

294 A New Symmetry of Electroweak Lagrangian

Problems of the Standard Model, associated with the introduction of non-gauge interactions and with the introduction of an electromagnetic field as a linear combination of fields on which various gauge groups are implemented, are analyzed. It is noticed that the existing model contains U(1) – phase uncertainty of the matrix elements of the raising and lowering generators of the SU(2) group. This uncertainty creates the condition for the additional local U(1) – symmetry of the Standard Model Lagrangian with respect to the choice of various equivalent generator representations of the SU(2) group. Such symmetry is provided by a gauge electromagnetic field introduction. In this case, due to the different action of the raising and lowering generators on the fields of each generation of leptons and quarks, these fields interact with the electromagnetic field in different ways.

Speaker: Mr Dmytro Ptashynskyi (Odessa National Polytechnic University)

295 Composite Higgs from Mass-Split Models

Beyond Standard Model theories describing the electro-weak sector must exhibit a large separation of scales (or "walking") to account for a light, 125 GeV Higgs boson and the fact that so far no other resonances have been observed. Large separation of scales arises naturally and in a tunable manner in mass-split models that are built on a conformal fixed point in the ultraviolet. Splitting the fermion masses into "light" (massless) and "heavy" flavors, the system shows conformal behavior in the ultraviolet but is chirally broken in the infrared. Due to the presence of a conformal fixed point, such chirally broken systems show hyperscaling and have a highly constrained resonance spectrum that is significantly different from the QCD spectrum. We highlight most characteristic features presenting numerical data obtained from dynamical simulations of an SU(3) gauge theory with four light and eight heavy flavors. In addition, we give an outlook on ongoing work simulating an SU(3) gauge theory with four light and six heavy flavors using a set-up well suited to explore e.g. mass-generation of Standard Model fermions via four-fermion interactions or partial compositeness.

Speaker: Oliver Witzel (University of Colorado Boulder)

Poster 370-0-CIPANPposter.pdf

296 Demonstration of 3D Micro-Power Readout for Liquid Argon Time Projection Chambers

We report the demonstration of a micro-power sensor designed for three-dimensional ionization charge detection and digital readout of liquid argon time projection chambers (LArTPCs). 3D readout is achieved using a custom-designed 32-channel system-on-a-chip ASIC (LArPix-v1), manufactured in 180 nm bulk CMOS, to uniquely instrument each pad in a charge-sensitive pad sensor array. Using a prototype sensor with 3 mm spacing between pads, we demonstrate low-noise ($<500\ e^-$ equivalent) low-power ($<100\ \mu$W/ch) ionization signal detection and readout of cosmic ray interactions in two LArTPCs with drift distances of 10 to 60 cm. This demonstration of 3D micro-power readout overcomes a critical technical obstacle for operation of LArTPCs in high-occupancy environments, such as the near detector site of the Deep Underground Neutrino Experiment (DUNE).

Speaker: Daniel Dwyer

297 Half-Lives of the Neutron-Rich $N=82$ Isotopes $^{130}$Cd and $^{131}$In

Half-lives of $N=82$ nuclei below doubly-magic $^{132}$Sn are key input parameters for calculations of any astrophysical $r$-process scenario and play an important role in the formation and shape of the second $r$-process abundance peak. In the past, shell-model calculations of neutron-rich nuclei near the $N=82$ neutron shell closure that are not yet experimentally accessible have been performed by adjusting the quenching of the Gamow-Teller (GT) operator to reproduce the half-life of $^{130}$Cd [1]. The calculated half-lives of other nuclei in the region are known to be systematically too long. Recently, a shorter half-life for $^{130}$Cd was reported [2,3]. A re-scaling of the GT quenching to the new $^{130}$Cd half-life by a constant factor resolved the discrepancy [2,3]. However, this GT rescaling creates a new discrepancy in the calculated half-life of $^{131}$In. The half-life measurement of $^{131}$In is complicated due to the presence of three known $\beta$-decaying states with similar half-lives, making photopeak gating an ideal method to measure each of these half-lives. In this talk, the half-lives of $^{130}$Cd and $^{131}$In, as well as the spectroscopy of the $\beta$ and $\beta-n$ decay of $^{131}$In measured using the GRIFFIN $\gamma$-ray spectrometer at TRIUMF will be presented. [1] M. Hannawald $\textit{et al.}$, Nucl. Phys. A $\textbf{688}$, 578 (2001) [2] R. Dunlop $\textit{et al.}$, Phys. Rev. C $\textbf{93}$, 062801(R) (2016) [3] G. Lorusso $\textit{et al.}$, Phys. Rev. Lett. $\textbf{114}$, 192501 (2015)

Speaker: Mr Ryan Dunlop (University of Guelph)

298 In-Ice Phased Antenna Arrays for Radiodetection of Energetic Neutrinos

Experiments such as the Askaryan Radio Array (ARA) use in-ice antennas to detect the Askaryan radio emission produced by interactions of ultra-high-energy neutrinos in glacial ice. A prototype phased array trigger was recently deployed with an ARA station this austral summer (December 2017–January 2018). The phased array trigger forms beams from multiple antennas in real time to reduce the electric field required to trigger the detector. This poster will report on the design, operation, and physics potential of the prototype.

Speaker: Dr Cosmin Deaconu (UChicago / KICP)

Poster 378-0-cipanp18_phased_array.pdf

299 Introducing the SnowBall Chamber, Supercooled Water for Dark Matter and Neutron Detection

We have all heard of the cloud and bubble chambers of course, and the latter in the context of direct WIMP dark matter detection even. However, no one has explored a third phase transition, into solid, until now that is. This poster will introduce the snowball chamber, which utilizes a supercooled liquid, just purified water in the prototype. An incoming particle triggers nucleation in the liquid, forming a solid. We will present the world's first definitive evidence that radiation can trigger freezing in metastable cold water, an effect never before observed, and in particular share AmBe neutron source calibration data, wherein multiple nucleation sites could be observed during the neutron source runs, another world first, making our device act just like a reverse bubble chamber. Because the reaction is exothermic, not endothermic as in a bubble chamber, the energy threshold should be lower, perfect for sub-GeV dark matter searches, for which we will show the measured gamma discrimination, high as in a bubble chamber, and the projected sensitivity, showing our new technology reaching the neutrino floor, with a smaller, more cost-effective detector than many of the competing new technologies. The crystallization may even have directionality which we will show preliminary evidence for: this would mean higher-density directional detectors than in gas, capable of not just reaching the neutrino floor but punching through it, at masses less than 10 GeV/$c^2$ at least.

Speaker: Matthew Szydagis (U Albany)

Poster 368-0-SnowBall_Szydagis_CIPANP18.pdf

300 Lessons from HAWC PWNe Observations: The Diffusion Constant is Not a Constant; Pulsars Remain the Likeliest Sources of the Anomalous Positron Fraction; Cosmic Rays are Trapped for Long Periods of Time in Pockets of Inefficient Diffusion

Recent TeV observations of nearby pulsars with the HAWC telescope have been interpreted as evidence that diffusion of high-energy electrons and positrons within pulsar wind nebulae is highly inefficient compared to the rest of the interstellar medium. If the diffusion coefficient well outside the nebula is close to the value inferred for the region inside the nebula, high-energy electrons and positrons produced by the two observed pulsars could not contribute significantly to the local measured cosmic-ray flux. The HAWC collaboration thus concluded that, under the assumption of isotropic and homogeneous diffusion, the two pulsars are ruled out as sources of the anomalous high-energy positron flux. Here, we argue that since the diffusion coefficient is likely not spatially homogeneous, the assumption leading to such conclusion is flawed. We solve the diffusion equation with a radially dependent diffusion coefficient, and show that the pulsars observed by HAWC produce potentially perfect matches to the observed high-energy positron fluxes. We also study the implications of inefficient diffusion within pulsar wind nebulae on Galactic scales, and show that cosmic rays are likely to have very long residence times in regions of inefficient diffusion. We describe how this prediction can be tested with studies of the diffuse Galactic emission.

Speaker: Mr Nicholas Omahen (University of California, Santa Cruz)

Poster 15-0-nomahen_CIPANP_CosmicR.pdf

301 Neutrino Burst-Generated Gravitational Radiation from Collapsing Supermassive Stars

We estimate the gravitational radiation signature of the $e^+e^-$ annihilation-driven neutrino burst accompanying the asymmetric collapse of an initially hydrostatic, radiation-dominated supermassive object suffering the Feynman-Chandrasekhar instability. An object with a mass $5\times10^4 \ \mathrm{M_{sun}} < M < 5\times10^5 \ \mathrm{M_{sun}}$, with primordial metallicity, is an optimal case with respect to the fraction of its rest mass emitted in neutrinos as it collapses to a black hole: lower initial mass objects will be subject to scattering-induced neutrino trapping and consequently lower efficiency in this mode of gravitational radiation generation; while higher masses will not get hot enough to radiate significant neutrino energy before producing a black hole. The optimal case collapse will radiate several percent of the star’s rest mass in neutrinos and, with an assumed small asymmetry in temperature at peak neutrino production, produces a characteristic linear memory gravitational wave burst signature. The timescale for this signature, depending on redshift, is $\sim$1 s to 10 s, optimal for proposed gravitational wave observatories like DECIGO. Using the response of that detector, and requiring a signal-to-noise ratio SNR $>5$, we estimate that collapse of a $5\times10^4 \ \mathrm{M_{sun}}$ supermassive star could produce a neutrino burst-generated gravitational radiation signature detectable to redshift $z < 7$. With the envisioned ultimate DECIGO design sensitivity, we estimate that the linear memory signal from these events could be detectable with SNR $>5$ to $z < 13$.

Speaker: Mr Jung-Tsung Li (UC San Diego)

Poster 339-0-CINANP_poster_JungtsungLi.pdf

302 New Techniques in the ANITA-IV Analysis

The ANtarctic Impulsive Transient Antenna (ANITA) is a NASA balloon-borne radio (180–1200 MHz) telescope sensitive both to impulsive Askaryan radio emission from ultra-high energy ($> 10^{18}$ eV) neutrino-initiated showers in the Antarctic ice sheet, as well as geomagnetically-induced radio emission from extensive air showers (EAS) initiated by cosmic rays or upward-going tau leptons that are created by tau neutrino interactions in the Earth. The fourth flight of ANITA completed Dec 29, 2016. I will report on the ongoing analysis of ANITA-IV data, with an emphasis on new techniques to reduce backgrounds from anthropogenic radio signals.

Speaker: Andrew Ludwig (University of Chicago)

303 Phases of UV Dark Matter Freeze In

WIMPs have not yet been seen via direct detection, indirect detection, or in collider searches. Perhaps now is a good time to consider alternate mechanisms for DM production. We investigate a new production mechanism for dark matter that consists of both a non-thermal freeze-in component as well as a hidden sector freeze-out.

Speaker: Lindsay Forestell (TRIUMF, UBC)

Slides 375-0-cipanp_poster_2018.pdf

304 Possibilities for Underground Physics in the Pyhäsalmi Mine

The underground mining in the Pyhäsalmi mine, Finland, is coming to an end in approximately 18 months after nearly 60 years of operation. The infrastructure of the mine is in excellent condition, including 1400-metre long vertical elevator shaft and 11-km long truck-size decline for transportation, large underground storage and service halls, offices, restaurant and modern communication services. An organization called Callio has been founded (https://callio.info) to maintain and operate the underground premises after the closure of the mine. There exists currently one dedicated laboratory hall (Lab2) for physics experiments at the deepest location of the mine. The overburden of 4100 mwe offers great possibilities for physics experiments requiring maximum shielding from cosmic muons. New excavations are possible. Currently there are two physics experiments running in the mine. EMMA is studying the composition of cosmic rays at the knee region. The array of 11 stations is situated at the depth of 75 m. The C14 experiment is situated in the laboratory hall Lab2. It is a small-size low-background set-up to map the concentration of carbon-14 in liquid scintillators.

Speaker: Wladyslaw Henryk Trzaska (University of Jyvaskyla)

Slides 374-0-Trzaska_poster_CIPANP2018.pdf

305 Progress Towards Measurement of the Nuclear Anapole Moment of Ba-137 Using BaF Molecules

Nuclear spin dependent parity violation (NSD-PV) effects in atoms and molecules arise from $Z^0$ boson exchange between electrons and the nucleus, and from the magnetic interaction between electrons and the parity-violating nuclear anapole moment. It has been proposed to study NSD- PV effects using an enhancement of the observable effect in diatomic molecules. Here, we demonstrate measurements of this type with sensitivity to NSD-PV effects surpassing that of any previous atomic PV measurement, using the test system $^{138}$Ba$^{19}$F. With $\sim$168 hours of data, we measure the matrix element, $W$, of the NSD-PV interaction with combined statistical and systematic uncertainty $\delta W < 0.7$ Hz. The sensitivity we demonstrate would be sufficient to measure NSD-PV effects of the size anticipated across a wide range of nuclei. We describe the details of our method and future improvements, including an extensive study of systematic errors associated with our technique, and show that these can be controlled at least at the level of the present statistical sensitivity.

Speaker: Dr Sidney Cahn (Yale University)

Poster 376-0-CIPANP_2018_Sidney_Cahn_Abstract376_2.pdf

306 Results from MICE: the Muon Ionization Cooling Experiment

The Muon Ionization Cooling Experiment (MICE) is a feasibility demonstration of a crucial emittance-reduction technique for future muon colliders and neutrino factories. MICE has studied the effect of ionization energy loss in low-Z absorber materials on a muon beam. Muons were focussed on lithium hydride and liquid hydrogen absorbers using a large-aperture solenoid. Particle tracking and identification detectors upstream and downstream of the absorber enabled the reconstruction of the phase-space coordinates of individual muons. The evolution of beam emittance was measured by studying the properties of ensembles of single muons using muon beams with varying input emittances and momenta. Data taken in 2016 and 2017 are currently being analyzed. The current status and most recent results are presented.

Speaker: Prof. Daniel Kaplan (Illinois Institute of Technology)

Poster 372-0-CIPANP2018-MICE-poster-R1.pdf

307 Search for a Nuclear Magnetic Quadrupole Moment in $^{173}$Yb

The fact that the universe is made entirely out of matter, and contains no free anti-matter, has no physical explanation. While we cannot currently say what process created the matter in the universe, we know that it must violate a number of fundamental symmetries, including those that forbid the existence of certain electromagnetic moments of fundamental particles. We can search for signatures of these electromagnetic moments via precision measurements in polar molecules, whose extremely large internal electromagnetic fields can significantly amplify these moments. These effects would arise from physics beyond the Standard Model, which enables tabletop searches for new, symmetry-violating particles and forces. With modern, quantum science techniques to control polar molecules, these searches can currently reach into the TeV scale, and offer a route to the PeV scale through advanced cooling and trapping techniques. I will discuss a new cryogenic molecular beam experiment being developed at Caltech to use polyatomic $^{173}$YbOH to search for hadronic CP violation via a nuclear magnetic quadrupole moment, which are sensitive to a wide variety of CP-violating sources beyond the Standard Model.

Speaker: Nick Hutzler (Caltech)

Poster 56-0-CIPANP-NRH-2018.pdf

308 Search for Anomalous Decay of the Free Neutron Using the UCNA Experiment: $n \to \chi + e^+ + e^-$

The neutron lifetime is currently measured by two different types of experiments: 'beam' and 'bottle'. These two measurement techniques have a $4\sigma$ discrepancy in measured lifetime. A recent paper proposes to resolve this issue by introducing a dark sector particle, $\chi$, that could offer an alternative decay channel for the neutron. This decay channel could resolve the discrepancy since beam experiments measure final decay products and bottle experiments measure remaining neutron population. The proposed theory allows for an $e^+ e^-$ pair produced in addition to a hypothesized $\chi$. The UCNA (Ultra Cold Neutron Asymmetry) experiment has sensitivity to this particular decay signature, since it would appear as a mono-energetic peak over a standard $\beta$ decay spectrum. In this experiment, polarized neutrons decay in a trap and their charged products are guided by a 1 T magnetic field to detectors on either side, thus effectively giving $4\pi$ detection coverage. Timing information and energy reconstruction is done on each $\beta$ decay. We use results from the UCNA experiment's 2012–2013 dataset to set limits on the branching fraction of this decay channel. In the case of a candidate $e^+ e^-$ pair, the summed reconstructed energy from both sides is used to set limits on the branching ratio of this decay channel, as a function of the mass of the hypothesized $\chi$. We present an overview of the calibration process and the limits on a neutron dark decay channel set by the UCNA experiment.

Speaker: Mr Xuan Sun (California Institute of Technology)

Poster 333-0-PPNS_poster.pdf

309 Using X-Ray Femtoscope and X-Ray Telescope We Verified that Dark Matter Behaves as Catalyst or as Inhibitor of the Nuclear Reactions

The X-ray femtoscope predictions: 1) Dark matter has resonances for the chemical elements Cr, Xe and Tm, which corresponds to the forces that gave the name to the WIMPs with adjustment of $R^2=0.996$. 2) Navier Stokes equations and solutions for the atomic nucleus are robust, since they naturally deliver the values of the following constants: neutron radius $r_n=0.843$ fm, measured for the first time, nuclear viscosity $9.77\times10^{22}\le ν \le 1.08\times10^{23}$ fm$^2$/s and Rydberg constant. 3) Dark matter produce nuclear catalysis. The X-ray telescope proofs: 1) Fluorescent dark matter has resonances in emission and absorption at low X-ray energies (3.5 keV). 2) Gravity appears indirectly through the first analytical solution to the millennium problem, associated with the Navier Stokes (NS) equations, which govern the stability of the incompressible nuclear fluid, and which have the range of magnitude of the gravity $10^{-30}$. 3) Dark matter interacts with baryonic matter as a catalyst or as an inhibitor, so it is not consumed in the nuclear reaction for Chandra X-Ray Galaxy Clusters at $z<1.4$.

Speaker: Prof. Edward Jimenez (Chemistry Engineering Faculty)

Paper 12-0-Dark_Matter_CIPANP2018.pdf

Poster 12-0-Dark_matter_POSTER.pdf

310 Visualizing Invisible Dark Matter Annihilation with the CMB and Matter Power Spectrum

We study the cosmological signatures of Invisibly Annihilating Dark Matter (IAnDM) where DM annihilates into dark radiation particles that are decoupled from the Standard Model (SM). In a large class of dark sector models such invisible annihilation determines the relic abundance of DM via dark thermal freezeout. We demonstrate that IAnDM may reveal itself through observable, novel signatures that are correlated: scale-dependent $\Delta N_\text{eff}$ (number of extra effective neutrinos) in the Cosmic Microwave Background (CMB) spectrum due to DM residual annihilation, while the phase of acoustic peaks shift towards the opposite direction relative to that due to SM neutrinos, resembling the effect due to scattering (fluid-like) thermal dark radiation. In addition, IAnDM induces modifications to the matter power spectrum that resemble yet are distinct from that due to warm dark matter. Current data is sensitive to IAnDM with masses up to $\sim200$ keV, while future observations will improve the reach, especially if the late-time DM annihilation cross-section is enhanced relative to the standard thermal value, which can be realized in a variety of scenarios.

Speaker: Dr Ran Huo (UC Riverside)

Slides 379-0-huor_IAnDM.pdf

Conference Banquet

Saturday, 2 June

Registration Desk: Open 07:30 – 17:30

Plenary 7: Neutrino Masses and Neutrino Mixing | Special Topic

Convener: Frank Calaprice (Princeton Univ.)

311 Recent Progress on Double Beta Decay and Latest GERDA Results

The definitive observation of neutrinoless double beta decay, (A, Z) $\to$ (A, Z+2) + 2$e^-$, would have two profound implications: it would establish that neutrinos are Majorana fermions and reveal that lepton number is not conserved. This relevance has caused a worldwide search for this process, using various isotopes and detector technologies. I will present in my talk a review of the overall experimental progress in the field, and describe in more detail the latest results from the Germanium Detector Array (GERDA) experiment that searches in the Gran Sasso underground laboratory LNGS for the neutrinoless double beta decay of $^{76}$Ge. I will conclude with a discussion of the prospects for the future.

Speaker: Prof. Karl Tasso Knoepfle (MPI Kernphysik)

Slides 84-0-CIPANP2018-KTKNOEPFLE.pdf

312 Neutrino Oscillations

In this talk I will review the current status of neutrino oscillations. Emphasis will be given to the determination of neutrino mass hierarchy and CP violating phase. I will also quickly summarize the progress towards LBNE and the status of short baseline anomalies.

Speaker: Pedro Machado (Fermilab)

Slides 74-0-Machado-CIPANP.pdf

313 Fingerprints of the First Stars in the Sky-Averaged Radio Spectrum

The period of the Universe known as Cosmic Dawn is marked by the formation of the first stars, before 100 million years after the Big Bang. These stars formed due to the gravitational collapse of primordial neutral hydrogen gas left over after the release of the cosmic microwave background (CMB). The ultraviolet radiation that these stars emitted penetrated the atoms of the surrounding neutral hydrogen gas, which caused the gas to absorb photons from the CMB. This alteration of the hydrogen gas should be observable today as an absorption feature in the radio spectrum at frequencies below 200 MHz. In this talk I will describe the detection by the EDGES experiment of an absorption feature in the sky-averaged spectrum centered at 78 MHz. This feature implies absorption of the microwave background by the hydrogen gas approximately 180 million years after the Big Bang, which is broadly consistent with predictions. However, the amplitude of the observed signal is $\sim$0.5 K, twice as large as expected. New theories have already been proposed that try to explain this deeper absorption. Two leading options correspond to a higher radiation background than previously thought during Cosmic Dawn, and a new form of interaction between the hydrogen gas with the colder dark matter. I will review the theory of this cosmological radio measurement and describe the EDGES experiment, including the instruments used for the detection and the data analysis.

Speaker: Dr Raul Monsalve (Colorado / McGill)

Slides 105-0-CIPANP.pdf

09:45 Break

Plenary 8: Nuclear Forces and Structure, NN Correlations, and Medium Effects | Parton and Gluon Distributions in Nucleons and Nuclei

Convener: Prof. Bradley Sherrill (Michigan State University)

314 The EMC Effect – New Insights and Future Studies

More than 30 years ago, the European Muon Collaboration provided evidence that quark distributions are modified in nuclei as compared to the free nucleon. The EMC Effect has been a subject of investigation, both experimentally and theoretically, ever since. To date, there is no universally accepted explanation of the EMC Effect, but recent results have given some exciting clues as to its possible origins. This presentation will focus on recent measurements of the EMC Effect and the future program of measurements of the nuclear dependence of quark distributions. Some of these measurements aim to explore the EMC Effect via measurements of a number of as-yet unmeasured nuclei, while others will attempt to gain insight via new observables, predicted to have significant nuclear effects that will provide sensitivity to particular models of the EMC Effect.

Speaker: David Gaskell (Jefferson Lab)

Slides 233-0-emc_effect_cipanp2018.pdf

315 Short-Range Correlations in Nuclei

The nuclear shell model pictures deeply bound nucleons as being in fully occupied states. At and above the Fermi surface, configuration mixing then leads to occupancies that gradually decrease to zero. This picture is modified in an important way by several correlation effects that are absent from, or are described only approximately by, effective-interaction theories, such as the shell model. These correlations arise from short-range, soft-core, and tensor nucleon-nucleon interactions and from longer-range couplings involving low-lying and giant resonance collective excitations. Over the years, a variety of experimental studies using different probes, including a set of complementary nuclear reactions, have been interpreted to reveal signatures of such correlation effects, including short-range correlations. The availability of rare-isotope beams has allowed expanding such explorations towards the extremes of isospin. This presentation will summarize the present status, challenges, and open questions.

Speaker: Prof. Alexandra Gade (NSCL/MSU)

Slides 78-0-CIPANP_2018_AlexGade_web.pdf

316 Light-Cone Physics and Large-Momentum Effective Field Theory

In high-energy scattering, the physics of hadrons can be described by various light-cone correlation functions, which include parton distributions, generalized parton distributions, distribution amplitudes, as well as the so-called light-cone wave functions. Because of their explicit time-dependence, these quantities cannot be calculated directly from QCD using Monte Carlo simulations. For years, theorists have resorted to analytical approaches such as light-cone quantization, with little success. In this talk, I will introduce large-momentum effective field theory as a novel approach to extract light-cone correlation functions from Euclidean observables calculable in lattice QCD. Some of recent successful examples are discussed, including the gluon helicity contribution to the proton spin and isovector parton densities.

Speaker: Dr Yong Zhao (Massachusetts Institute of Technology)

Slides 234-0-cipanp_yongzhao.pdf

317 The Structure of the Nucleon

The nucleon is a complex composite object. Its structure, the dynamics of its constituents and its mass presently cannot be calculated from Quantum Chromo Dynamics without simplifying model assumptions. Momentum- and spin-dependent distributions of quarks and gluons have been determined with increasing precision through 50 years of deep inelastic lepton-proton scattering experiments and the QCD analysis of 30 years of high energy proton-proton collider data. Despite this significant effort, there remain important shortcomings in the knowledge of proton structure. We will review present experimental knowledge and discuss the impact future high precision measurements at Jefferson Laboratory and EIC will have.

Speaker: Dr Matthias Grosse Perdekamp (UIUC, Department of Physics)

Slides 380-0-The_Structure_of_the_Nucleon.pdf

12:30 Lunch

Plenary 9: Neutron Star Mergers

Convener: Prof. Akif Baha Balantekin (University of Wisconsin-Madison)

318 LIGO/VIRGO Observations of Neutron Star Merger GW170817

Neutron stars host the densest stable matter in the universe. Accurately modeling their multi-messenger astrophysics relies on a detailed description of the equation of state above nuclear density. Astronomical observations, including binary pulsar dynamics, x-ray bursts and timing, and gravitational-wave observations, can in turn be used to constrain the properties of this dense matter. On August 17, 2017 the Advanced LIGO and Advanced Virgo detectors discovered the first gravitational-wave signal consistent with a binary neutron star inspiral. A gamma-ray burst detected 1.7 seconds after merger confirmed the long-held hypothesis that neutron-star mergers produce short gamma-ray bursts, and the three-dimensional localization of the source using LIGO and Virgo data enabled a successful electromagnetic follow-up campaign that identified an associated kilonova in a galaxy $\sim$40 Mpc from Earth. Using the observed gravitational waves we are able to constrain the equation of state of dense matter in neutron stars. I will outline how these constraints are made, how they connect with other astronomical observations, and outline future prospects for connecting gravitational-wave astronomy with above-nuclear-density physics.

Speaker: Dr Jocelyn Read (CSU Fullerton)

Slides 124-1-Read-CIPANP2018.pdf https://www.dropbox.com/s/g9wxsfmcao9331n/Read-CIPANP2018.key

319 Outflow from Neutron Star Mergers

A neutron star merger, GW170817, was discovered by Advanced LIGO. The gravitational wave signal is followed by electromagnetic counterparts in multi-wavelength including GRB 170817A, kilonova, and non-thermal synchrotron afterglow. These emissions are produced by outflows launched in the merger. I will talk about the properties of different components of merger outflows and implications of electromagnetic observations of GW170817.

Speaker: Dr Kenta Hotokezaka (Princeton University)

320 Physics from the Gravitational and Electromagnetic Waves of a Neutron Star Merger

The recent detection of gravitational waves and associated electromagnetic emission from a binary neutron star merger has illuminated the physics of strong gravity and dense matter, and addressed long standing questions as to the origin of the heaviest elements in the universe. I will review our physical understanding of compact object mergers — grounded in theoretical calculations and numerical simulations — and will describe how observations of gravitational waves, high energy photons, and radioactively powered optical emission have important physical implications, including constraints on the speed of gravity, the expansion rate of the universe, the equation of state of nuclear matter, and the nucleosynthesis of the heavy elements. I'll highlight the successes and limitations of models of neutron star mergers, and anticipate what we may see and learn in a hopeful future of numerous, diverse joint gravitational + electromagnetic wave detections.

Speaker: Daniel Kasen (UC Berkeley/LBNL)

15:45 Break

Parton and Gluon Distributions in Nucleons and Nuclei: Parallel 9 — Exclusive Physics and Future

Convener: Dr Ralf Seidl (RIKEN)

321 Accessing the Generalized Parton Distributions in the Valence Region at Jefferson Laboratory

The generalized parton distributions (GPDs) describe the correlations between the transverse position and the longitudinal momentum of a parton inside the nucleon. They represent the next step toward a complete description of the nucleon in terms of quarks and gluons. They are accessible through deep exclusive processes among which we find the deeply virtual Compton scattering (DVCS) and the deep virtual meson production (DVMP). With its longitudinally polarized electron beam sent to fixed targets inside three experimental Halls, Jefferson Laboratory is a unique facility to probe the quarks and gluons in the valence region of the nucleon. The first experimental evidence of GPD sensitivity at Jefferson Laboratory was provided by measuring a non-zero beam spin asymmetry for photon electroproduction, arising from the interference between Bethe-Heitler and DVCS, in 1999 in the Hall B of Jefferson Laboratory. Then followed a complete experimental program dedicated to DVMP and DVCS in the different experimental Halls. In this talk, we are going to introduce the GPDs and the information they encode about the inner structure of the nucleon. Then we are going to give an overview of the main deep exclusive processes results collected at Jefferson Laboratory and the information they have provided about the GPDs. Finally we will discuss the answers we can expect from the ongoing/future experimental program with the recently upgraded experimental Halls and the 12 GeV electron beam.

Speaker: Dr Maxime DEFURNE (CEA-Saclay)

Slides 23-0-CIPANP18.pdf

322 Drell-Yan Physics with Negative Pion Beams and Polarized Proton Targets at COMPASS

The proton is a complex composite object. Its structure, the dynamics of its constituents and its mass presently cannot be calculated from Quantum Chromo Dynamics without simplifying model assumptions. Momentum- and spin-dependent distributions of the constituent partons, quarks and gluons, have been determined from the QCD analysis of data sets taken in deep inelastic lepton-proton scattering experiments and in high energy proton-proton collider experiments. Despite the very significant experimental and theoretical effort, there remain important shortcomings in the knowledge of proton structure. COMPASS at CERN aims to improve the knowledge of Generalized Parton Distributions (GPDs) through exclusive muon-proton scattering. Using Drell-Yan production of muon pairs with negative pion beams on polarized proton targets, COMPASS will constrain transverse momentum dependent quark distributions of the proton. The Drell-Yan process is a well-understood electromagnetic effect in which a beam-hadron quark/anti-quark annihilates with a target hadron anti-quark/quark. It is well suited to explore the sea quark structure of the proton, transverse momentum- and transverse spin-dependent quark distributions (TMDs) and nuclear effects in proton quark structure. The presentation will introduce the Drell-Yan process and discuss the latest results on TMD observables from COMPASS. The talk will conclude with a discussion of plans for future Drell-Yan experiments with high-intensity meson and anti-proton beams at the CERN SPS.

Speaker: Prof. Matthias Grosse Perdekamp (UIUC)

Slides 347-0-Intersection-DY-June-2018.pdf

323 Generalized Parton Distributions of the Deuteron in a Covariant Framework

Generalized parton distributions (GPDs) of the deuteron have been calculated. The results of these calculations and the formalism used will be presented. General properties of spin-1 GPDs, including polynomiality sum rules, will be discussed. It will be shown that these expected properties are observed in a convolution formalism if nuclear structure is calculated in a Lorentz-covariant manner. A four-Fermi contact interaction based on the NJL model is used to construct a covariant deuteron wave function, which is in turn used to calculate GPDs, gravitational form factors, and transverse (impact parameter dependent) parton densities of the deuteron.

Speaker: Dr Adam Freese (Argonne National Laboratory)

Slides 168-0-slideshow.pdf

324 Probing the Strange Sea Quarks with Kaon SIDIS

It is well known that protons and neutrons are made from constituents, called quarks and gluons, which give substructure to these particles. The goal of this project is to make measurements of the spatial distributions and the momenta of the quarks that provide a three-dimensional map of quarks in the nuclear medium. This knowledge provides the basis of our understanding of nuclear matter in terms of the dynamics of their internal constituents. This abstract focuses on the study of the contribution of the sea quarks and in particular of the strange sea to the proton spin structure. This study is feasible with semi-inclusive deep inelastic scattering of electrons off proton and deuteron targets in Hall B at Jefferson Lab. To achieve the desired precision, a Ring Imagine CHerenkov (RICH) detector was built so pion, kaon and proton identification is well performed in the momentum range of 3 to 8 GeV/c. The experimental method and projected precision of the measurements of the parton distributions using Kaon SIDIS will be discussed and the status of the recently built Hybrid RICH detector will be presented.

Speaker: Mrs Fatiha Benmokhtar (Duquesne University)

Slides 35-0-Benmokhtar-CIPANP2018.ppt

325 Novel Experimental Probes of QCD in SIDIS and $e^+e^-$ Annihilation

Semi-inclusive deep inelastic Scattering (SIDIS) has been a very successful tool to investigate the partonic structure of the nucleon over the last decade. Compared to inclusive DIS, information about the quantum numbers of the struck quark can be inferred from the identity, distribution and polarization of the final state hadrons. Up to now, virtually all knowledge about the quark-gluon structure of the nucleon from SIDIS has been gained from distributions of independently observed scalar hadrons. However, given the amount of data current and future experiments at JLab, RHIC, KEK and the EIC will collect, new paradigms have to be explored to leverage the statistical power of the data. Similar to other fields in nuclear and particle physics, it is natural to move towards the exploration of more complex correlations in the observed final state. This talk will discuss recent results and future prospects of using di-hadron correlations and polarized hyperon probes to study QCD in SIDIS, $pp$ and $e^+e^-$ annihilation. Both of these probes exploit additional degrees of freedom in the final state, given by the relative momentum of the di-hadron pair and the hyperon polarization, respectively. This talk will focus on recent results and opportunities opened by these probes to study nucleon structure, hadronization and QCD in novel ways. The focus will be on planned SIDIS measurements at CLAS12 at JLab and $e^+e^-$ at Belle II.

Speaker: Anselm Vossen (Duke University/JLab)

Slides 143-0-NovelProbesCipanpVossen.pdf

Physics at High Energies: Parallel 9 — LHC Future | Theory

Conveners: Prof. Stefania Gori (University of Cincinnati), Verena Martinez Outschoorn (UMass Amherst)

326 CMS Physics Performance with Precision Timing

As part of the Phase II upgrade program, the Compact Muon Solenoid (CMS) detector will incorporate a new timing layer designed to measure minimum ionizing particles (MIPs) with a time resolution of $\sim$30 ps. Precision timing will mitigate the impact of the challenging levels of pileup expected at the High Luminosity LHC. The time information assigned to each track will enable the use of 4D-vertexing which will render a 5-fold pile-up reduction, thus recovering the current conditions. Precision timing will also enable new time-based isolations and improved $b$-tagging algorithms. All of this translates into a $\sim$20% gain in effective luminosity when looking at di-Higgs boson events decaying to a pair of $b$-quarks and two photons. We present the expected improvements in physics performance with precision timing with the upgraded CMS detector.

Speaker: Mr Olmo Cerri (Caltech)

Slides 338-0-2018-06-04_CIPANP.pdf

327 Expected Performance of the Upgraded ATLAS Experiment for HL-LHC

The Large Hadron Collider (LHC) has been successfully delivering proton-proton collision data at the unprecedented center of mass energy of 13 TeV. An upgrade is planned to increase the instantaneous luminosity delivered by the LHC in what is called the HL-LHC, aiming to deliver a total of up to 3,000 fb$^{-1}$ to 4,000 fb$^{-1}$ of data per experiment. To cope with the expected data-taking conditions, ATLAS is planning major upgrades of the detector. It is now a critical time for these upgrade projects and during the last year and a half, six Technical Design Reports (TDR) were produced by the ATLAS Collaboration. In these TDRs the physics motivation and benefits of such upgrades are discussed together with details of the upgrade project itself. In this contribution we review the expected performance of the upgraded ATLAS detector and the expected reach for physics measurements as well as the discovery potential for new physics that is expected by the end of the HL-LHC data-taking. The performance of object reconstruction under the expected pile-up conditions will beshown, including a fully re-optimized $b$-tagging algorithm. Important benchmark physics projections including di-Higgs boson production sensitivity will be discussed.

Speaker: Peilian Liu (UC Berkeley)

Slides 119-0-phaseII-ATLAS-detector-performance.pdf

328 Precision Timing with the CMS Detector

The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is undergoing an extensive Phase II upgrade program to prepare for the challenging conditions of the High-Luminosity LHC (HL-LHC). A new timing layer is designed to measure minimum ionizing particles (MIPs) with a time resolution of $\sim$30 ps and hermetic coverage up to a pseudo-rapidity of $|\eta|=3$. This MIP Timing Detector (MTD) will consist of a central barrel region based on LYSO:Ce crystals read out with SiPMs and two end-caps instrumented with radiation-tolerant Low Gain Avalanche Detectors (LGADs). The precision time information from the MTD will reduce the effects of the high levels of pile-up expected at the HL-LHC, and will bring new and unique capabilities to the CMS detector. We present the current status and ongoing R&D of the MTD, including recent test beam results.

Speaker: Irene Dutta (Caltech)

Slides 334-0-PrecisionTiming_with_the_CMS_MIP_Detector__2_.pdf

329 Muon Spectrometer Phase I Upgrade for the ATLAS Experiment: The New Small Wheels Project

The instantaneous luminosity of the Large Hadron Collider at CERN will be increased up to a factor of five with respect to the design value. To maintain excellent detection and background rejection capability in the forward region of the ATLAS detector, part of the muon detection system will be upgraded during the LHC long shutdown period of 2019–2020, with the complete replacement of the present first station in the forward regions with the so-called New Small Wheels (NSWs). The NSWs will have a diameter of approximately 15 m and will be made of two detector technologies: Micromegas detectors and small-strip thin gap chambers (sTGC). The physics motivation for this significant upgrade to the ATLAS detector will be presented. The design choices made to address the physics needs will be discussed. Finally, the status of the ongoing detector modules production will be presented.

Speaker: Mr Benoit Lefebvre (McGill University)

Slides 298-0-CIPANP-NSW.pdf

330 Machine Learning for New Physics Searches

After an introduction to machine learning from the perspective of a theoretical physicist, I will describe a new method to perform a model independent search for new phenomena, with an emphasis on the LHC. I will discuss a systematic way to address the look-elsewhere effect and other issues that led similar attempts to fail in the past.

Speaker: Dr Raffaele Tito D'Agnolo (SLAC)

Slides 272-0-dagnolo_cipanp.pdf

331 How a Future Leptonic Collider Will Indirectly Probe Neutralino Dark Matter

We apply the covariant derivative expansion method to integrate out the neutralinos and charginos in the minimal supersymmetric Standard Model. The results are presented as set of pure bosonic dimension-six operators in the Standard Model effective field theory. In global fitting to the proposed leptonic collider constraint projections, special phenomenological emphasis is paid to the gaugino mass unification scenario (M2 $\simeq$ 2M1) and anomaly mediation scenario (M1 $\simeq$ 3.3M2). These results show that the precision measurement experiments in future lepton colliders will provide a very useful complementary job in probing the electroweakino sector, in particular, filling the gap of the soft lepton plus the missing $E_T$ channel search left by the traditional collider, where the neutralino as the lightest supersymmetric particle is very degenerated with the next-to-lightest chargino/neutralino.

Speaker: Dr Ran Huo (UC Riverside)

Slides 320-0-huor_EWino.pdf

QCDHS / PPHI: Parallel 9 — The Proton Radius Puzzle

Convener: Dr Seamus Riordan (Argonne National Laboratory)

332 The Proton Radius Puzzle – Why We All Should Care

A new scalar boson which couples to the muon and proton can simultaneously solve the proton radius puzzle and the muon anomalous magnetic moment discrepancy. Using a variety of measurements, we constrain the mass of this scalar and its couplings to the electron, muon, neutron, and proton. Making no assumptions about the underlying model, these constraints and the requirement that it solve both problems limit the mass of the scalar to between about 100 keV and 100 MeV. We identify two unexplored regions in the coupling constant-mass plane. The implications of recent experiments are discussed.

Speaker: Prof. Gerald Miller (University of Washington)

Slides 131-0-MillerCIPANP.pdf

333 The Rydberg Constant and Proton Size from Atomic Hydrogen

Precision measurements of atomic hydrogen (H) have long been successfully used to extract fundamental constants and to test bound-state quantum electrodynamics. Both the Rydberg constant $R_\infty$ and the proton root mean square charge radius $r_\mathrm{p}$ can be determined by H spectroscopy, requiring the measurement of at least two transition frequencies. With the very precisely measured 1S-2S transition frequency serving as a corner stone [1], the current limitation is the measurement precision of other H transition frequencies. Moreover, the CODATA 2014 value [2] for $r_\mathrm{p}$, containing the H spectroscopy world data and elastic scattering results, disagrees by 5.6 standard deviations ($\sigma$) with the much more precise value extracted from spectroscopy of muonic hydrogen ($\mu$p) [3]. Using a cryogenic beam of H atoms optically excited to the initial 2S state, we measured the 2S-4P transition in H with a relative uncertainty of 4 parts in $10^{12}$ [4]. Combining our result with the 1S-2S transition frequency yields the values of the Rydberg constant $R_\infty = 10973731.568076(96)$ m$^{-1}$ and $r_\mathrm{p} = 0.8335(95)$ fm. Our $r_\mathrm{p}$ value is 3.7$\sigma$ smaller than the CODATA value, but in good agreement with the $\mu$p value. [1] C.G. Parthey $\textit{et al.}$, Phys. Rev. Lett. $\textbf{107}$, 203001 (2011). [2] P.J. Mohr $\textit{et al.}$, Rev. Mod. Phys. $\textbf{88}$, 035009 (2016). [3] A. Antognini $\textit{et al.}$, Science $\textbf{339}$, 417 (2013). [4] A. Beyer $\textit{et al.}$, Science $\textbf{358}$, 79 (2017).

Speaker: Mr Lothar Maisenbacher (Max Planck Institute of Quantum Optics)

Slides 148-0-2018-06_Maisenbacher_CIPANP_Hydrogen.pptx

334 Data Analysis and Preliminary Results of the Proton Charge Radius Experiment (PRad) at JLab

In order to investigate the proton radius puzzle, the PRad experiment (E12-11-106) [1] was performed in 2016 in Hall B at Jefferson Lab, with both 1.1 and 2.2 GeV unpolarized electron beams. The experiment aims to measure the $e$-$p$ elastic scattering cross section at unprecedented low values of the momentum transfer squared region ($Q^2 = 2\times10^{-4} - 0.06$ (GeV/c)$^2$), with a sub-percent precision. The PRad experiment utilizes a non-magnetic calorimetric method with a large acceptance and high resolution calorimeter (HyCal), and two large area, high spatial resolution Gas Electron Multiplier (GEM) detectors. To have a better control over the systematic uncertainties, the absolute $e$-$p$ elastic scattering cross section is normalized to that of the well-known Moller scattering process, which is measured simultaneously within similar kinematics and geometrical acceptances. The windowless H$_2$-gas-flow target utilized in the experiment largely removes a typical background source, the target cell windows. In this talk, we will discuss details of the data analysis and present preliminary results from both beam energy settings. [1] Spokespersons: A. Gasparian (contact), H. Gao, M. Khandaker, D. Dutta.

Speaker: Weizhi Xiong (Duke University)

Slides 102-0-CIPANP_2018_PRad.pdf

335 Determination of the Proton’s Charge Radius by Simultaneous Measurement of Electron- and Muon-Proton Elastic Scattering with the MUSE Experiment at PSI

The mean charge radius of the proton has been measured with elastic electron scattering and through spectroscopy of atomic hydrogen with consistent results. Recent results based on spectroscopic measurements of muonic hydrogen, however, have found a notably smaller charge radius with extremely high precision. This difference, known as the Proton Radius Puzzle, raises interesting issues ranging from experimental and methodological issues to physics beyond the Standard Model. To address some of these issues, the MUon proton Scattering Experiment (MUSE) at the Paul Scherrer Institute will measure positive and negative muon, electron and positron elastic scattering from the proton. The experiment will cover a four-momentum-transfer range from 0.002 to 0.08 GeV$^2$. These data will be used to study possible differences between electron and muon interactions, to measure two-photon exchange effects, and to extract the proton charge radius. An overview of the experiment and its status will be presented.

Speaker: Dr Paul E Reimer (Argonne National Laboratory)

Slides 193-0-2018ReimerMuSECIPANP.pdf

336 Lattice QCD and the Proton Radius

With the continuing discrepancy in experimental measurements of the proton radius, $\textit{ab initio}$ determination of this quantity from QCD is urgently needed. At present, QCD calculations on a lattice are performed with physical values of light and strange quarks and adequate lattice volumes to permit credible control of systematic errors. One particular obstacle to computing the nucleon charge radius directly is the finite volume of the lattice, in which particle momenta are quantized making the zero-momentum limit difficult. New lattice methods have to be designed specifically to study the small-momentum nucleon structure on a lattice. I will overview the methodology and summarize the current status and future outlook for lattice QCD calculations of the nucleon charge radius.

Speaker: Prof. Sergey Syritsyn (Stony Brook University)

Slides 251-0-syritsyn-2018-cipanp-rEp.pdf

337 Nucleon Form Factors in Dispersively Improved Chiral Effective Theory

We present a new method for calculating the nucleon electromagnetic form factors (EM FFs) combining Chiral Effective Field Theory (ChEFT) and dispersion analysis [1]. The FFs are expressed as dispersive integrals over the two-pion cut at timelike $t > 4 M_\pi^2$. The spectral functions are computed using elastic unitarity, chiral pion-nucleon amplitudes (LO, NLO, partial N2LO), and timelike pion FF data. The method effectively includes $\pi\pi$ rescattering effects and the $\rho$ resonance and leads to major improvements compared to traditional ChEFT calculations. Higher-mass isovector and isoscalar $t$-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). We obtain excellent agreement with the spacelike proton and neutron FF data up to $Q^2 \sim 1$ GeV$^2$. We predict the values of the higher FF derivatives with minimal uncertainties and study their collective behavior (multiple dynamical scales, unnatural sizes). Our approach provides a FF parametrization with proper analyticity and theoretical uncertainty estimates, which can be used for analysis of low-$Q^2$ elastic scattering data and extraction of the proton radius [2]. [1] J.M. Alarcon, C. Weiss, Phys. Rev. C 97, 055203 (2018). [2] J.M. Alarcon, C. Weiss, arXiv:1803.09748 [hep-ph].

Speaker: Christian Weiss (Jefferson Lab)

Slides 356-0-weiss18_cipanp18.pdf

Quark Matter and High Energy Heavy Ion Collisions: Parallel 9 — QCD Phase Transition | New Instrumentation

Conveners: Prof. Jacquelyn Noronha-Hostler (Rutgers University), Marta Verweij (Vanderbilt University)

338 QCD Phase Diagram

The crucial properties of the QCD vacuum — confinement and chiral symmetry breaking — undergo qualitative changes at sufficiently high temperatures and/or baryon densities. Determining where on the phase diagram and how the transitions between QCD phases are accomplished is the major goal of heavy-ion collision experiments, as well as of theoretical efforts including first-principle lattice calculations. Is there a critical point in QCD separating crossover from the first order transition on the boundary between quark-gluon plasma and hadron gas phases? Heavy-ion collision experiments could answer this question by focusing on universal signatures characteristic of critical phenomena.

Speaker: Mikhail Stephanov (University of Illinois at Chicago)

Slides 304-0-cipanp-2018-slides.pdf

339 Lattice QCD Constraints on the QCD Critical Point

The physics of the transition from the hadronic to quark-gluon plasma phase is non-perturbative and lattice QCD provides a framework for $\textit{ab initio}$ calculations in this regime of QCD. It is expected that the QCD phase diagram in the temperature-baryon chemical potential plane contains a line of first-order phase transitions that ends at a critical point. $\textit{Ab initio}$ calculations at non-zero chemical potential are difficult due to the sign problem. However, significant progress has been made by using the Taylor expansion and imaginary chemical potential methods. Lattice calculations of the fluctuations and correlations of conserved charges and the higher-order cumulants, that I will review in this talk, allow one to access a region of non-zero chemical potential and put constraints on the possible location of the critical point.

Speaker: Dr Alexei Bazavov (Michigan State University)

Slides 364-0-bazavov_cipanp18.pdf

340 Searching for the QCD Critical Point Through Fluctuations at RHIC

Fluctuations and correlations of conserved quantities (baryon number, strangeness, and charge) can be used to probe phases of strongly interacting QCD matter and the possible existence of a critical point in the phase diagram. The cumulants of the multiplicity distributions related to these conserved quantities are expected to be sensitive to possible increased fluctuations near a critical point and their ratios can be directly compared to the ratios of the susceptibilities from Lattice QCD. In this talk, we will present the measurements of the cumulants of net-proton multiplicity distributions from Au+Au collisions at $\sqrt{s_{NN}} = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4$ (up to fourth order) and 200 GeV (up to sixth order) as measured by the STAR experiment at RHIC. Multi-particle correlation functions will also be presented. The measurement of higher-order cumulants are extremely sensitive to experimental artifacts. Current efficiency correction methods are based on Binomial models. We will introduce an unfolding technique to account for multiplicity-dependent detector response and efficiency variations using large samples of AMPT events. The comparison of the various correction approaches should provide important guidance towards a reliable experimental determination of the multiplicity cumulants.

Speaker: Roli Esha (UCLA)

Slides 227-0-cipanp18_roliesha.pdf

341 What Have We Leant from Quarkonia Production in Relativistic Heavy Ion Collisions?

Since the pioneering study by Matsui and Satz on $J/\psi$ suppression by quark-gluon plasma formation in relativistic heavy ion collisions, there have been a large number of theoretical and experimental studies on this topic. These studies have significantly enhanced our understanding of the properties of $J/psi$, its excited states, and other quarkonium states consisting of bottom quarks at finite temperature as well as of their production in heavy ion collisions. For example, some quarkonia are shown to survive in a quark-gluon plasma and can also be regenerated from heavy quarks at hadronization during heavy ion collisions. Using the hydrodynamic model for the dynamics of heavy ion collisions, many groups have found that to describe the experimental data on the nuclear modification factors and transverse momentum spectra of quarkonia measured at SPS, RHIC, and the LHC requires the inclusion of the in-medium properties and dissociation cross sections of quarkonia as well as their regeneration at hadronization. Studying quarkonia production in relativistic heavy ion collisions thus allows us to probe their in-medium properties.

Speaker: Prof. Che-Ming Ko (Texas A&M University)

Slides 312-0-ko_jpsi_cipan2018.pdf

342 The sPHENIX Detector

sPHENIX is a large-acceptance, high-rate jet and $\Upsilon$ detector designed to study the structure of the quark-gluon plasma in heavy ion collisions at RHIC. It consists of full calorimeter over the full azimuth for $|\eta|<1.1$ with tracking and precision vertexing. These components will provide full jet reconstruction, heavy-flavor jet tagging, and $\Upsilon$ spectroscopy. We will present an overview of the sPHENIX design goals, construction, running schedule, and anticipated physics program.

Speaker: Dr Ron Soltz (Lawrence Livermore National Laboratory)

Slides 362-0-sphenix_cipanp18_soltz.pdf

343 The RHIC Beam Energy Scan Phase II Physics and Upgrades

The exploration of the QCD phase diagram has been one of the main drivers of contemporary nuclear physics. The Relativistic Heavy Ion Collider (RHIC) at BNL is uniquely suited for this task through its Beam Energy Scan (BES) program which allowed for a large range in baryon chemical potential $\mu_B$ as was successfully demonstrated after the completion of Phase 1 in 2014. Phase 2 of the BES at RHIC is scheduled for 2019–2020 and will explore with precision measurements the intermediate-to-high $\mu_B$ region of the QCD phase diagram, 5 energies $\sqrt{s_{_{NN}}}$ from 19.6 to 7.7 GeV in the collider mode and 8 energies $\sqrt{s_{_{NN}}}$ from 7.7 to 3.0 GeV in the fixed-target mode. Some of the key measurements are: the net-protons kurtosis that could pinpoint the position of a critical point, the directed flow that might prove a softening of the EOS, and the chiral restoration in the dielectron channel. These measurements will be possible with an order of magnitude better statistics provided by the electron cooling upgrade of RHIC and with the detector upgrades planned to improve STAR's acceptance. The talk will review the BES Phase-2 program and the physics opportunities enabled by these upgrades.

Speaker: David Tlusty (Rice University)

230-0-CIPANP2018Tlusty.pdf

Tests of Symmetries and the Electroweak Interaction: Parallel 9 — Hadronic Parity Violation | Symmetries in Atoms

Convener: Brad Filippone (caltech)

344 Hadronic Parity Violation and the Large-$N_c$ Expansion

Parity-violating quark-quark interactions are well understood within the Standard Model, but their manifestation at the hadronic level is complicated by nonperturbative QCD effects. While different parameterizations of parity-violating nucleon-nucleon interactions exist, very little is known about the corresponding couplings. The application of the large-$N_c$ expansion to parity-violating nucleon-nucleon interactions provides theoretical constraints on the size of the couplings. This analysis establishes a hierarchy of terms that can be mapped onto parity-violating potentials. This hierarchy implies relations between couplings and helps to delineate the terms that should be most important in phenomenological applications.

Speaker: Prof. Matthias Schindler (University of South Carolina)

Slides 255-0-CIPANP18_Schindler.pdf

345 Final Results from the n3He Experiment: Parity Violation in n-$^3$He Capture

Parity violation (PV), first observed in semileptonic decays, has been determined precisely for quarks and leptons as part of the Standard Model. At the hadronic level, it offers a unique probe of nucleon structure and the underlying low-energy behavior of non-perturbative QCD. The hadronic weak interaction is characterized in terms of five spin and isospin dependent S-P transition amplitudes. There is an active program to determine these low energy couplings from hadronic PV observables using cold neutron beams at the Spallation Neutron Source (ORNL) and the NCNR reactor (NIST). These experiments are carried out in few-body observables, for which the nuclear wave functions are exactly calculable, but the effects are dominated by the strong interaction by seven orders of magnitude. The n3He experiment recently completed a measurement of the PV directional proton asymmetry with respect to the neutron spin in the reaction n + $^3$He $\to$ p + $^3$H. In this talk, we will report the final result, which is sensitive to the $\Delta I = 0,1$ transition amplitude and provides significant constraints for new theory calculations.

Speaker: Prof. Michael Gericke (University of Manitoba)

Slides 178-0-GerickeN3He.pdf

346 Large-Nc HPNC Analyses Post NPDGamma

It has long been appreciated that low-energy weak parity non-conserving interactions between nucleons are governed by five S-P amplitudes, as originally described by Danilov. The formalism can also be recast in pionless effective field theory, where the low-energy constants (LECs) are the coefficients of the Danilov amplitudes. Lacking five high-quality independent constraints on these LECs, many past analyses have relied on meson exchange theory for some guidance as to which of the five amplitudes might be dominant. This approach has had mixed success in correlating the data, particularly as no experimental evidence has so far emerged for a nonzero weak pion-nucleon-nucleon coupling. Recently a new hierarchy for the LECs has emerged from large Nc QCD. I describe a recent analysis based on this approach, one that appears to describe existing data quite well, while altering the relationships among past and anticipated experiments. I discuss how NPDGamma, other new experiments, and a future lattice QCD calculation of the isotensor Danilov amplitude will further advance the field.

Speaker: Prof. Wick Haxton (UC Berkeley)

Slides 2-0-HPNC_Wick.pdf

347 Lattice QCD for Hadronic Parity Violation

The parity violating neutral current is the least well understood of all currents in the Standard Model. At low energies, these weak interactions manifest as short distance, 4-fermion operators. Unlike their flavor-changing charged counterparts, which are easy to detect experimentally, the neutral current interactions exist in the background of the strong interactions with a typical strength of $G_F F_\pi^2 \sim 10^{-7}$, where $F_\pi\sim92$ MeV is the pion decay constant, a typical hadronic scale. Therefore, despite major efforts, there are very few measurements of the hadronic neutral weak interaction. Lattice QCD is a non-perturbative regulator for QCD, the fundamental theory of strong interactions, and provides a rigorous tool with which to compute the strength of the hadronic neutral current in the simplest hadronic and nuclear systems. I will describe a long-term effort aimed at understanding hadronic parity violation from QCD. One of the simplest systems to use lattice QCD for, the iso-tensor hadronic parity violating NN amplitude, is one of the most promising for shedding light on our current understanding. I will motivate the need and application of lattice QCD for understanding hadronic parity violation from the Standard Model and highlight related lattice QCD results.

Speaker: Andre Walker-Loud

Slides 243-0-Walker-Loud_LQCD_PV.pdf

348 Nuclear Anapole Moments

Purely hadronic weak interactions inside a nucleus produce a toroidal current distribution around the axis of nuclear spin. This distribution, known as the nuclear anapole moment, produces a local magnetic field that couples to the spin of a penetrating electron. This in turn gives rise to a nuclear spin-dependent parity-violating (NSD-PV) electron-nucleus interaction. We study NSD-PV effects using diatomic molecules, where the signal can be dramatically amplified due to near-degeneracies of opposite parity hyperfine/rotation levels. We recently demonstrated unprecedented experimental sensitivity to NSD-PV interactions in the test system $^{138}$Ba$^{19}$F, where the effect is known to be vanishingly small. Our results indicate control over systematic errors at a level below the statistical uncertainty. We discuss plans to measure NSD-PV using $^{137}$BaF at similar sensitivity. This will yield the first measurement of a nuclear anapole moment for an odd-neutron nucleus, and provide novel information on hadronic PV interactions. Anticipated future improvements should enable measurements of anapole moments of light nuclei, where the nuclear structure calculations needed to interpret anapole moments in terms of hadronic weak interaction parameters are increasingly reliable.

Speaker: Dr Sidney Cahn (Yale University)

Slides 254-0-5_CIPANP9_Cahn.pptx

349 Searching for Hadronic CP Violation in Deformed Nuclei with Polar Molecules

The fact that the universe is made entirely out of matter, and contains no free anti-matter, has no physical explanation. While we cannot currently say what process created the matter in the universe, we know that it must violate a number of fundamental symmetries, including those that forbid the existence of certain electromagnetic moments of fundamental particles. We can search for signatures of these electromagnetic moments via precision measurements in polar molecules, whose extremely large internal electromagnetic fields can significantly amplify these moments. These effects would arise from physics beyond the Standard Model, which enables tabletop searches for new, symmetry-violating particles and forces. With modern, quantum science techniques to control polar molecules, these searches can currently reach into the TeV scale, and offer a route to the PeV scale through advanced cooling and trapping techniques. I will discuss a new experiment being developed at Caltech to use polyatomic molecules bearing heavy, deformed nuclei to search for hadronic CP violation via nuclear magnetic quadrupole moments, which are sensitive to a wide variety of CP-violating sources beyond the Standard Model.

Speaker: Nick Hutzler (Caltech)

Slides 55-0-NRH-CIPANP-2018-Talk.pdf

Public Lecture: Barry Barish, Caltech "Black Holes and Gravitational Waves"

Convener: Dr David Nygren (University of Texas at Arlington)

350 Merging Black Holes and Einstein's Ripples in Space Time: The Story of Advanced LIGO

Public Talk Sponsors: Physics Letters B, UC Berkeley, and UC Riverside

Speaker: Prof. Barry C. Barish (Caltech)

Sunday, 3 June

Registration Desk: Open 07:30 – 12:00

Plenary 10a: Conveners' Highlights

Convener: Prof. Wick Haxton (UC Berkeley)

351 Physics at High Energies

Highlights of the Physics at High Energies parallel sessions at this conference.

Speakers: Prof. Stefania Gori (University of Cincinnati), Verena Martinez Outschoorn (UMass Amherst)

Slides 382-0-SummaryTalk_PHE_CIPANP.pdf

352 Precision Physics at High Intensities

Highlights of the Precision Physics at High Intensities parallel sessions at this conference.

Speakers: Prof. Aida El-Khadra (University of Illinois at Urbana-Champaign), Renee Fatemi (University of Kentucky)

Slides 383-0-PPHI_summary.pdf

353 Neutrino Masses and Neutrino Mixing

Highlights of the Neutrino Masses and Neutrino Mixing parallel sessions at this conference.

Speaker: Prof. Andre de Gouvea (Northwestern University)

354 Particle and Nuclear Astrophysics

Highlights of the Particle and Nuclear Astrophysics parallel sessions at this conference.

Speaker: Dr Barry Davids (TRIUMF)

Slides 388-0-CIPANP2018_PNA.pdf

355 Nuclear Forces and Structure, NN Correlations, and Medium Effects

Highlights of the Nuclear Forces and Structure, NN Correlations, and Medium Effects parallel sessions at this conference.

Speaker: Dr Paul E Reimer (Argonne National Laboratory)

Slides 392-0-2018CIPANPSummaryNucForceEtc.pdf

09:45 Break

Plenary 10b: Conveners' Highlights

Convener: Brendan Casey

356 Heavy Flavors and the CKM Matrix

Highlights of the Heavy Flavors and the CKM Matrix parallel sessions at this conference.

Speaker: Wolfgang Altmannshofer (University of Cincinnati)

Slides 389-0-HFCKM_altmannshofer.pdf

357 QCD, Hadron Spectroscopy, and Exotics

Highlights of the QCD, Hadron Spectroscopy, and Exotics parallel sessions at this conference.

Speaker: Dr Seamus Riordan (Argonne National Laboratory)

Slides 390-0-riordan_qcdhs_cipanp18.pdf

358 Parton and Gluon Distributions in Nucleons and Nuclei

Highlights of the Parton and Gluon Distributions in Nucleons and Nuclei parallel sessions at this conference.

Speaker: Dr Ralf Seidl (RIKEN)

Slides 391-0-2018_06_03_CIPANP_PGNN_Seidl.pdf

359 Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity

Highlights of the Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity parallel sessions at this conference.

Speaker: Kev Abazajian (UC Irvine)

Slides 384-0-Abazajian_CDPE_Summary.pdf 384-1-CIPANP_CDPE_Summary.key

360 Dark Matter

Highlights of the Dark Matter parallel sessions at this conference.

Speaker: Prof. George Fuller (University of California, San Diego)

361 Tests of Symmetries and the Electroweak Interaction

Highlights of the Tests of Symmetries and the Electroweak Interaction parallel sessions at this conference.

Speaker: Prof. Wick Haxton (UC Berkeley)

Slides 386-0-TSEI_Summary_slides_BWF.pdf

362 Quark Matter and High Energy Heavy Ion Collisions

Highlights of the Quark Matter and High Energy Heavy Ion Collisions parallel sessions at this conference.

Speaker: Prof. Wick Haxton (UC Berkeley)

Slides 393-0-QMHI_overview.pdf

363 Closing Remarks

Closing remarks, acknowledgements, and announcement of the co-chair for CIPANP 2021.

Speaker: Dr Brendan Casey (Fermilab)

Slides 394-0-closing.pptx