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Subject: First Results from HPS
Speaker:    Omar Moreno
SLAC National Accelerator Laboratory
Date: Wednesday, May 3, 2017
Time: 2:30 p.m.
Place: Cebaf Center Auditorium
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/c2. 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 its coupling to electric charge. Since heavy photons couple to electrons, they can be produced through a process analogous to bremsstrahlung and subsequently decay 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. An HPS engineering run took place in experimental Hall B during spring of 2015 using a 1.056 GeV, 50 nA beam and collected 1165 nb-1 (7.29 mC) of data. This talk will present the results of a resonance search for a heavy photon using this data.

Subject: The Next Steps in Dark Sector Science: Recent Results and New Opportunities for Accelerator Experiments
Speaker:    Philip Schuster
SLAC National Accelerator Laboratory
Date: Friday, May 5, 2017
Time: 11 a.m.
Place: Cebaf Center Auditorium
Abstract:New physics motivated by dark matter with GeV-scale mass has attracted considerable attention in the past several years, motivated in part by findings from direct detection, satellite, and LHC experiments, as well as precision measurements and basic theory. As such, GeV-scale "dark sector" scenarios have become the focus of a broad and growing international program of experiments with many new results and discovery opportunities. This talk will summarize the goals and recent progress in this field, and highlight near future priority science milestones for dark sector experiments operating at Jefferson Lab in particular.


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