Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 77: Search for Dark Matter 4

T 77.1: Talk

Wednesday, March 23, 2022, 16:15–16:30, T-H36

Light dark matter search using SuperCDMS single-charge-sensitive devices and anticoincident tagging — •Alexander Zaytsev for the SuperCDMS collaboration — Karlsruher Institut für Technologie, Karlsruhe, Germany

As a part of its R&D program, the SuperCDMS collaboration has been developing cryogenic gram-scale eV-resolution (HVeV) detectors that utilize Neganov-Trofimov-Luke amplification by applying a voltage bias across the Si crystals. During the two previous above-ground dark matter (DM) searches, each collecting data with only one HVeV detector, competitive constraints were obtained for DM-electron scattering, as well as for dark photon and axion-like particle absorption. However during the second HVeV run, a background characterized by bursts of single electron-hole pair events was observed, which may originate from luminescence in SiO2 - the primary component of the detector holder material. Single-pulse events from the tails of such bursts degrade the sensitivity of the HVeV DM searches in the entire mass range of interest. In the latest underground HVeV DM search (Run 3), we have collected O(10) gram-days of exposure using three HVeV detectors, operated simultaneously within a shared housing. We present the current progress of the respective DM search analysis, which is expected to surpass the previous HVeV DM limits by utilizing an inter-detector anticoincidence event selection that considerably suppresses the rate of background events caused by bursts.