Semi-annihilating $Z_3$ Dark Matter for XENON1T Excess

Abstract

The recently reported result from XENON1T experiment indicates that there is an excess with $3.5\sigma$ significance in the electronic recoil events. Interpreted as new physics, new sources are needed to account for the electronic scattering. We show that a dark fermion $\psi$ with mass about $\mathcal{O}\left(10\right)$ MeV from semi-annihilation of $Z_3$ dark matter $X$ and subsequent decay of a dark gauge boson $V_{\mu }$ may be responsible for the excess. The relevant semi-annihilation process is $X+X\to \overline{X}+V_{\mu }(\to \psi +\overline{\psi })$, in which the final $\psi$ has a box-shape energy spectrum. The fast-moving $\psi$ can scatter with electron through an additional gauge boson that mixes with photon kinetically. The shape of the signals in this model can be consistent with the observed excess. The additional interaction with proton makes this model testable in future searches for nucleus recoil as well. Because of the lightness of invisible particle introduced, this scenario requires non-standard cosmology to accommodate the additional radiation component.

arXiv comment19 pages, 4 figures, published version

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• An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess
• Constraints on electron-scattering interpretation of XENON1T excess
• A multi-component SIMP model with $U(1{)}_X\to Z_2\times Z_3$
• Canonical seesaw implication for two-component dark matter
• Boosted Self-Interacting Dark Matter and XENON1T Excess
• Solar Active-Sterile Neutrino Conversion with Atomic Effects at Dark Matter Direct Detection Experiments
• Terrestrial Probes of Electromagnetically Interacting Dark Radiation
• GeV Scale Inelastic Dark Matter with Dark Photon Mediator via Direct Detection and Cosmological/Laboratory Constraints
• Explaining The XENON1T Excess With Light Goldstini Dark Matter
• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
• The centers of discrete groups as stabilizers of Dark Matter
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