Xenon1T excess from electron recoils of non-relativistic Dark Matter

Abstract

We show that electron recoils induced by non-relativistic Dark Matter interactions can fit well the recently reported Xenon1T excess, if they are mediated by a light pseudo-scalar in the MeV range. This is due to the favorable momentum-dependence of the resulting scattering rate, which partially compensates the unfavorable kinematics that tends to strongly suppress keV electron recoils. We study the phenomenology of the mediator and identify the allowed parameter space of the Xenon1T excess which is compatible with all experimental limits. We also find that the anomalous magnetic moments $(g-2{)}_{\mu ,e}$ of muons and electrons can be simultaneously explained in this scenario, at the prize of a fine-tuning in the couplings of the order of a few percent.

5 pages, 4 figures; v2: updated experimental values for (g_2)_mu; some clarifications and references added; conclusions unchanged; version published in PLB

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• A Leptonic ALP Portal to the Dark Sector
• Testing axion couplings to leptons in $Z$ decays at future $e^{+}{e}^{-}$ colliders
• Boosted Self-Interacting Dark Matter and XENON1T Excess
• Challenges for a QCD Axion at the 10 MeV Scale
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
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• Anomaly-free ALP from non-Abelian flavor symmetry
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• Study of $\eta \to {\pi }^{+}{\pi }^{-}{l}^{+}{l}^{-}$