[Jlab-seminars] Physics Seminars: May 3, 2017 Omar Moreno; May 5, 2017 Philip Schuster

[Stephanie Tysor]

Physics Seminar 

Omar Moreno: SLAC National Accelerator Laboratory 



“ First Results from HPS ” 



Wednesday, May 3, 2017 

2:30 pm 

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/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 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 . 











Physics Seminar 

Philip Schuster: SLAC National Accelerator Laboratory 



“ The Next Steps in Dark Sector Science: 

Recent Results and New Opportunities for Accelerator Experiments ” 



Friday, May 5, 2017 

11:00 am 

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. 













-- 
Stephanie Tysor 
Hall A Administrative Assistant 
Thomas Jefferson National Accelerator Facility 
(office)757-269-6005 (fax)757-269-5235 
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