Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 77: Search for Dark Matter 4
T 77.8: Vortrag
Mittwoch, 23. März 2022, 18:00–18:15, T-H36
EXCESS workshop: a collaborative investigation of the sub-keV backgrounds observed in various rare event search experiments — •Margarita Kaznacheeva1, Alexander Fuss2,3, Florian Reindl2,3, and Felix Wagner2 — 1Physik-Department E15, Technische Universität München, D-85748 Garching, Germany — 2Institut für Hochenergiephysik der Österreichischen Akademie der Wissenschaften, 1050 Wien, Austria — 3Atominstitut, Technische Universität Wien, 1020 Wien, Austria
After having lowered the energy thresholds down to O(10eV), various dark matter and coherent elastic neutrino-nucleus scattering experiments observe an unexpected exponential rise of the event rate towards low energies. This excess signal caused by an as yet unknown origin currently provides the main limitation for further sensitivity improvement. A collective initiative to share experimental observations and compare the measured excess signals was started. I will report the outcomes of the dedicated EXCESS workshop that took place in June 2021 as a joint effort of 10 collaborations and lead to an in-depth discussion within the community. Presented measurements were taken by cryogenic, CCD, and gaseous ionization detectors, under and above ground, with different levels of shielding and a wide range of operating temperatures. In the scope of the workshop, a publicly accessible data repository was created that allows studying the sub-keV excess signals measured by the participating collaborations. A summary paper of the workshop is expected to be published in early 2022 and further meetings are already planned.