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2020

Sun Heated MeV-scale Dark Matter and the XENON1T Electron Recoil Excess

Chen, Yifan, Cui, Ming-Yang, Shu, Jing et al.

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The XENON1T collaboration reported an excess of the low-energy electron recoil events between 1 and 7 keV.

We explore the possibility to explain such an anomaly by the MeV-scale dark matter (DM) heated by the interior of the Sun due to the same DM-electron interaction as in the detector.
The kinetic energies of heated DM particles can reach a few keV, and can potentially account for the excess signals detected by XENON1T.
We study different form factors of the DM-electron interactions, $F(q)\propto q^i$ with $i=0,1,2$ and $q$ being the momentum exchange, and find that for all these cases the inclusion of the Sun-heated DM component improves the fit to the XENON1T data.

Sun Heated MeV-scale Dark Matter and the XENON1T Electron Recoil Excess · Around

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