http://arxiv.org/abs/2007.06401
We propose that the 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 massless 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. The dark fermion relic density in both freeze-in and freeze-out scenarios has been calculated and found to be able to account for the observed dark matter abundance.
C. Chiang and B. Lu
Tue, 14 Jul 20
-166/97
Comments: 4 pages, 3 figures
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