Xenon-1T excess as a possible signal of a sub-GeV hidden sector dark matter

Abstract

We present a particle physics model to explain the observed enhancement in the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based on a $U(1)$ extension of the Standard Model where the dark sector consists of two essentially mass degenerate Dirac fermions in the sub-GeV region with a small mass splitting interacting with a dark photon. The dark photon is unstable and decays before the big bang nucleosynthesis, which leads to the dark matter constituted of two essentially mass degenerate Dirac fermions. The Xenon-1T excess is computed via the inelastic exothermic scattering of the heavier dark fermion from a bound electron in xenon to the lighter dark fermion producing the observed excess events in the recoil electron energy. The model can be tested with further data from Xenon-1T and in future experiments such as SuperCDMS.

arXiv comment21 pages, 4 figures, 1 table. Accepted for publication in JHEP

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Cited by in corpus (12)

• A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• Direct detection of dark energy: the XENON1T excess and future prospects
• Self-interacting Inelastic Dark Matter in the light of XENON1T excess
• Pushing the frontier of WIMPy inelastic dark matter: journey to the end of the periodic table
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• Interpretation of the XENON1T excess in the model with decaying sterile neutrinos
• Inelastic Dirac Dark Matter