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First germanium-based constraints on sub-MeV Dark Matter with the EDELWEISS experiment

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arxiv 2003.01046 v2 pith:SHZEQ77B submitted 2020-03-02 astro-ph.GA astro-ph.IMphysics.ins-det

classification astro-ph.GAastro-ph.IMphysics.ins-det
keywords darkconstraintscryogenicedelweisselectronsfirstinteractingmatter
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The EDELWEISS collaboration has performed a search for Dark Matter (DM) particles interacting with electrons using a 33.4 g Ge cryogenic detector operated underground at the LSM. A charge resolution of 0.53 electron-hole pairs (RMS) has been achieved using the Neganov-Trofimov-Luke amplification with a bias of 78 V. We set the first Ge-based constraints on sub-MeV/c$^{2}$ DM particles interacting with electrons, as well as on dark photons down to 1 eV/c$^2$. These are competitive with other searches. In particular, new limits are set on the kinetic mixing of dark photon DM in a so far unconstrained parameter space region in the 6 to 9 eV/c$^2$ mass range. These results demonstrate the high relevance of cryogenic Ge detectors for the search of DM interactions producing eV-scale electron signals.

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Cited by 9 Pith papers

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