May 29, 2018 to June 3, 2018
Hyatt Regency Indian Wells Conference Center
US/Pacific timezone

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

May 30, 2018, 6:10 PM
20m
East Foyer | Larkspur/Mesquite Rooms (Hyatt Regency Indian Wells Conference Center)

East Foyer | Larkspur/Mesquite Rooms

Hyatt Regency Indian Wells Conference Center

44600 Indian Wells Lane, Indian Wells, CA 92210, USA
Parallel DM DM / PPHI

Speaker

Omar Moreno (SLAC National Accelerator Laboratory)

Description

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.
E-mail [email protected]
Collaboration name Heavy Photon Search

Primary author

Omar Moreno (SLAC National Accelerator Laboratory)

Presentation materials