The Search for Heavy Photons

Speaker: Matthew Solt

Time: 12:00pm June 7 2017

Location: SUSB 3004 (Havasu)

Abstract

The Heavy Photon Search (HPS) experiment at Jefferson Lab is searching for a 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 range is theoretically favorable and may also mediate dark matter interactions. The A' couples to the ordinary photon through kinetic mixing, which induces their 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 at Jefferson Lab 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 is accessing unexplored regions in the mass-coupling phase space. This talk will present an overview of everything that is the HPS experiment including the latest results and the future of HPS.