Conveners
Quark Matter and High Energy Heavy Ion Collisions: Parallel 5 — Small Systems and the Limits of the Quark Gluon Plasma
- Marta Verweij (Vanderbilt University)
- Jacquelyn Noronha-Hostler (Rutgers University)
Quark Matter and High Energy Heavy Ion Collisions: Parallel 6 — Heavy Ions at the LHC
- Marta Verweij (Vanderbilt University)
- Jacquelyn Noronha-Hostler (Rutgers University)
Quark Matter and High Energy Heavy Ion Collisions: Parallel 8 — Jet Substructure and Quenching / Flavor
- Marta Verweij (Vanderbilt University)
- Jacquelyn Noronha-Hostler (Rutgers University)
Quark Matter and High Energy Heavy Ion Collisions: Parallel 9 — QCD Phase Transition | New Instrumentation
- Marta Verweij (Vanderbilt University)
- Jacquelyn Noronha-Hostler (Rutgers University)
Prof.
Jacquelyn Noronha-Hostler
(Rutgers University)
31/05/2018, 14:00
QMHI
Parallel
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...
Zhenyu Chen
(Rice University)
31/05/2018, 14:20
QMHI
Parallel
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...
Sylvia Morrow
(Vanderbilt University)
31/05/2018, 14:40
QMHI
Parallel
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...
Giuliano Giacalone
(IPhT Saclay)
31/05/2018, 15:00
QMHI
Parallel
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...
Ryan Weller
(MIT)
31/05/2018, 15:20
QMHI
Parallel
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...
Brian Cole
(Columbia University)
31/05/2018, 16:10
QMHI
Parallel
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...
Prof.
Manuel Calderon de la Barca Sanchez
(UC Davis)
31/05/2018, 16:40
QMHI
Parallel
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...
Wladyslaw Henryk Trzaska
(University of Jyvaskyla)
31/05/2018, 17:10
QMHI
Parallel
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...
Mr
Davide Caffarri
(NIKHEF - Amsterdam)
31/05/2018, 17:30
QMHI
Parallel
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...
Ms
Barbara Trzeciak
(Utrecht Univeristy)
31/05/2018, 17:50
QMHI
Parallel
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...
Dr
LongGang Pang
(UC Berkeley and LBNL)
31/05/2018, 18:10
QMHI
Parallel
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...
Dr
Christine Nattrass
(University of Tennessee, Knoxville)
01/06/2018, 16:10
QMHI
Parallel
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...
Dr
Abhijit Majumder
(Wayne State University)
01/06/2018, 16:40
QMHI
Parallel
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...
Prof.
Saskia Mioduszewski
(Texas A&M University)
01/06/2018, 17:10
QMHI
Parallel
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...
Kyle Lee
(Stony Brook University)
01/06/2018, 17:30
QMHI
Parallel
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...
Shanshan Cao
(Wayne State University)
01/06/2018, 17:50
QMHI
Parallel
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...
Dr
Xuan Li
(Los Alamos National Lab)
01/06/2018, 18:10
QMHI
Parallel
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...
Mikhail Stephanov
(University of Illinois at Chicago)
02/06/2018, 16:10
QMHI
Parallel
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...
Dr
Alexei Bazavov
(Michigan State University)
02/06/2018, 16:40
QMHI
Parallel
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. $\textit{Ab initio}$...
Roli Esha
(UCLA)
02/06/2018, 17:10
QMHI
Parallel
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...
Prof.
Che-Ming Ko
(Texas A&M University)
02/06/2018, 17:30
QMHI
Parallel
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...
Dr
Ron Soltz
(Lawrence Livermore National Laboratory)
02/06/2018, 17:50
QMHI
Parallel
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...
David Tlusty
(Rice University)
02/06/2018, 18:10
QMHI
Parallel
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...
