Evidence of a simple dark sector from XENON1T excess

Abstract

We propose that the nearly massless dark photons produced from the annihilation of keV dark fermions in the Galaxy can induce the excess of electron recoil events recently observed in the XENON1T experiment. The minimal model for this is the extension of a $U(1{)}_X$ gauge symmetry, under which the dark photon couples to both dark and visible matter currents. We find that the best-fit parameters of the dark sector are compatible with the most stringent constraints from stellar cooling. We also show that in the freeze-out scenario, the dark fermions can explain the anomaly while contributing $\gtrsim 1\%$ of the DM relic density.

arXiv comment5 pages, 3 figures. v2: minor changes to match the published version

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• Observability of the Higgs boson decay to a photon and a dark photon
• Dark Fluxes from Accreting Black Holes and Direct Detections
• Dark photon - dark energy stationary axisymmetric black holes
• Inelastic dark matter, small scale problems, and the XENON1T excess
• Measuring properties of a dark photon from semi-invisible decay of the Higgs boson