On-shell mediator dark matter models and the Xenon1T anomaly

Abstract

We present a dark matter model to explain the excess events in the electron recoil data recently reported by the Xenon1T experiment. In our model, dark matter $\chi$ annihilates into a pair of on-shell particles $\varphi$ which subsequently decay into $\psi \psi$ final state; $\psi$ interacts with electron to generate the observed excess events. Due to the mass hierarchy, the velocity of $\psi$ can be rather large and can have an extended distribution, which provides a good fit to the electron recoil energy spectrum. We estimated the flux of $\psi$ from dark matter annihilations in the galaxy and further determined the interaction cross section which is sizable but small enough to allow $\psi$ to penetrate the rocks to reach the underground labs.

arXiv comment4 pages, 3 figures

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Cited by in corpus (24)

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• Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess
• Global fits of axion-like particles to XENON1T and astrophysical data
• An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess
• Direct Detection of Spin-Dependent Sub-GeV Dark Matter via Migdal Effect
• Probing the relaxed relaxion and Higgs-portal with S1 & S2
• Self-interacting Inelastic Dark Matter in the light of XENON1T excess
• Sun Heated MeV-scale Dark Matter and the XENON1T Electron Recoil Excess
• Constraints on electron-scattering interpretation of XENON1T excess
• XENON1T Excess: Some Possible Backgrounds
• Canonical seesaw implication for two-component dark matter
• EFT Approach of Inelastic Dark Matter for Xenon Electron Recoil Detection
• Xenon-1T excess as a possible signal of a sub-GeV hidden sector dark matter
• Solar Active-Sterile Neutrino Conversion with Atomic Effects at Dark Matter Direct Detection Experiments
• Probing sub-GeV leptophilic dark matter at Belle II and NA64
• Detection of Inelastic Dark Matter via Electron Recoils in SENSEI
• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
• Connecting Low scale Seesaw for Neutrino Mass to Inelastic sub-GeV Dark Matter with Abelian Gauge Symmetry
• Dark Fluxes from Accreting Black Holes and Direct Detections
• Interpretation of XENON1T excess with MeV boosted dark matter
• Lepton Number Violating Electron Recoils in a $U(1{)}_{B-L}$ Model with Non-Standard Interactions