Kavli Affiliate: Paul Brink
| 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 $barσ_e$ 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 $barσ_e,=,8.7times10^-34$ cm$^2$, $varepsilon,=,3.3times10^-14$, and $g_ae,=,1.0times10^-9$.
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