2020/05/31 by SuperCDMS Collaboration, D. W. Amaral, T. Aralis +116 · 1 citation
Physics and Astronomy · #hep-ex #astro-ph.CO #physics.ins-det
paper · pdf · doi:10.1103/physrevd.102.091101
published as Phys. Rev. D 102, 091101 (2020) · 5 pages + title and references, 3 figures and 1 table
arxiv created 2021/01/29 · arxiv updated 2021/02/01
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 σe is constrained for dark matter masses from 0.5--104 MeV/c2; in the mass range from 1.2--50 eV/c2 the dark photon kinetic mixing parameter ε and the axioelectric coupling constant gae are constrained. The minimum 90% confidence-level upper limits within the above mentioned mass ranges are σe = 8.7×10-34 cm2, ε = 3.3×10-14, and gae = 1.0×10-9.