We present the first limits on inelastic electron-scattering dark matter and dark photon absorption using a prototype SuperCDMS detector having a charge resolution of 0.1 electron-hole pairs (CDMS HVeV, a 0.93 g CDMS high-voltage device). These electron-recoil limits significantly improve experimental constraints on dark matter particles with masses as low as 1 MeV/c2. We demonstrate a sensitivity to dark photons competitive with other leading approaches but using substantially less exposure (0.49 g d). These results demonstrate the scientific potential of phonon-mediated semiconductor detectors that are sensitive to single electronic excitations.
|Original language||English (US)|
|Journal||Physical review letters|
|State||Published - Aug 3 2018|
Bibliographical noteFunding Information:
National Science Foundation, the U.S. Department of Energy, NSERC Canada, the Canada First Research Excellence Fund, MultiDark, and Michael M. Garland.
© 2018 authors. Published by the American Physical Society.