Kavli Affiliate: D. B. Macfarlane
| First 5 Authors: SuperCDMS Collaboration, D. W. Amaral, T. Aralis, T. Aramaki, I. J. Arnquist
| Summary:
This article presents an analysis and the resulting limits on light dark
matter inelastically scattering off of electrons, and on dark photon and
axion-like particle absorption, using a second-generation SuperCDMS
high-voltage eV-resolution detector. The 0.93 gram Si detector achieved a 3 eV
phonon energy resolution; for a detector bias of 100 V, this corresponds to a
charge resolution of 3% of a single electron-hole pair. The energy spectrum is
reported from a blind analysis with 1.2 gram-days of exposure acquired in an
above-ground laboratory. With charge carrier trapping and impact ionization
effects incorporated into the dark matter signal models, the dark
matter-electron cross section $bar{sigma}_{e}$ is constrained for dark matter
masses from 0.5–$10^{4} $MeV$/c^{2}$; in the mass range from 1.2–50
eV$/c^{2}$ the dark photon kinetic mixing parameter $varepsilon$ and the
axioelectric coupling constant $g_{ae}$ are constrained. The minimum 90%
confidence-level upper limits within the above mentioned mass ranges are
$bar{sigma}_{e},=,8.7times10^{-34}$ cm$^{2}$,
$varepsilon,=,3.3times10^{-14}$, and $g_{ae},=,1.0times10^{-9}$.
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