Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Dark Matter III

T 76.2: Talk

Thursday, April 2, 2020, 16:45–17:00, H-HS XIV

Dark Matter Constraints from SuperCDMS Single-Charge Sensitive Detectors — •Matthew Wilson for the SuperCDMS collaboration — Universität Hamburg

Direct search limits on electron-scattering dark matter and dark absorption limits are examined using prototype phonon-mediated SuperCDMS R&D detectors with sub-electron-hole pair charge resolution (CDMS HVeV, 0.93 gram CDMS Si devices). The first science run with a HVeV device (HVeV R1) achieved a resolution of 0.1 electron-hole pairs and an exposure of 0.49 gram days. The results of HVeV R1 significantly improved the experimental constraints on electron-recoiling dark matter with masses as low as 0.5 MeV/c², and demonstrated sensitivity to dark photons competitive with other leading approaches but using substantially less exposure. The second science run with a HVeV device (HVeV R2) achieved roughly 3 times better resolution compared to HVeV R1 with >2.5 times more exposure. The improved HVeV R2 detector design also included a second channel with the goal of fiducializing detector events to reduce backgrounds. The latest HVeV results are shown, demonstrating the scientific potential of phonon-mediated semiconductor detectors sensitive to single electron excitations.