BEGIN:VCALENDAR
VERSION:2.0
PRODID:Data::ICal 0.22
BEGIN:VEVENT
DESCRIPTION:Stepan Stepanyan\, JLAB\n\n
The overwhelming evidence for d
ark matter (DM) in cosmological observations\, manifested by its gravitati
onal interactions\, has inspired a major experimental effort to uncover it
s particle nature. The LHC\, as well as direct and indirect detection expe
riments\, have significantly constrained one of the best-motivated weak-sc
ale DM models (WIMPs as dark matter candidates). In contrast\, scenarios i
nvolving a light hidden sector dark matter with mediators in the MeV-GeV r
ange has garnered a good deal of attention. Models with a hidden U(1) gaug
e symmetry\, with a "\;dark"\; or "\;hidden sector"\; phot
ons\, are particularly attractive as they can be tested experimentally. If
they exist\, dark or heavy photons mix with ordinary photons through kine
tic mixing\, which induces their weak coupling to electrons\, &isin\;e. Si
nce they couple to electrons\, heavy photons are radiated in electron scat
tering and can subsequently decay into e+e-. Experim
ents at Jefferson Lab use these features to search for heavy photons in th
e mass range of 20 MeV/c2 to 500 MeV/c2 and couplings of \;&isin\;2 >\; 10 \;-10 \;.
\n\nIn this talk\
, I will summarize the experimental program for dark photon searches at Je
fferson Lab. Results from the experiments that already took data\, APEX an
d HPS\, will be discussed together with plans for future measurements.\n\n
 \;
\n\n
 \;
\n\n
 \;
\n
DTSTART:20201028T200000Z
LOCATION:Online\, Room via Zoom
SUMMARY:Heavy or dark photon searches at Jefferson Lab
END:VEVENT
END:VCALENDAR