Hydrogen portal to exotic radioactivity

Abstract

We show that in a special class of dark sector models, the hydrogen atom can serve as a portal to new physics, through its decay occurring in abundant populations in the Sun and on Earth. The large fluxes of hydrogen decay daughter states can be detected via their decay or scattering. By constructing two models for either detection channel, we show that the recently reported excess in electron recoils at XENON1T could be explained by such signals in large regions of parameter space unconstrained by proton and hydrogen decay limits.

arXiv comment4 pages + refs, 3 figures

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• Luminous solar neutrinos I: Dipole portals
• Millicharged Cosmic Rays and Low Recoil Detectors
• Global fits of axion-like particles to XENON1T and astrophysical data
• Cosmological and astrophysical probes of dark baryons
• Direct detection of freeze-in inelastic dark matter
• Exclusion limits on Dark Matter-Neutrino Scattering Cross-section
• An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess
• Solar Neutrino Scattering with Electron into Massive Sterile Neutrino
• Xenon1T excess from electron recoils of non-relativistic Dark Matter
• Shedding New Light on Sterile Neutrinos from XENON1T Experiment
• Luminous solar neutrinos II: Mass-mixing portals
• Constraints on electron-scattering interpretation of XENON1T excess
• XENON1T Excess: Some Possible Backgrounds
• Boosted Self-Interacting Dark Matter and XENON1T Excess
• Dark sectors in neutron-shining-through-a-wall and nuclear absorption signals
• Neutron Dark Decay
• EFT Interpretation of XENON1T Electron Recoil Excess: Neutrinos and Dark Matter
• Distinctive signals of boosted dark matter from its semi-annihilation
• Terrestrial Probes of Electromagnetically Interacting Dark Radiation
• How Macroscopic Limits on Neutron Star Baryon Loss Yield Microscopic Limits on Non-Standard-Model Baryon Decay
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• Low Scale String Theory Benchmarks for Hidden Photon Dark Matter Interpretations of the XENON1T Anomaly
• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
• Dark Fluxes from Accreting Black Holes and Direct Detections
• The Hydrogen Mixing Portal, Its Origins, and Its Cosmological Effects
• Lepton Number Violating Electron Recoils in a $U(1{)}_{B-L}$ Model with Non-Standard Interactions