Xenon-1T excess as a possible signal of a sub-GeV hidden sector dark matter

Abstract

We present a particle physics model to explain the observed enhancement in the Xenon-1T data at an electron recoil energy of 2.5 keV. The model is based on a $U(1)$ extension of the Standard Model where the dark sector consists of two essentially mass degenerate Dirac fermions in the sub-GeV region with a small mass splitting interacting with a dark photon. The dark photon is unstable and decays before the big bang nucleosynthesis, which leads to the dark matter constituted of two essentially mass degenerate Dirac fermions. The Xenon-1T excess is computed via the inelastic exothermic scattering of the heavier dark fermion from a bound electron in xenon to the lighter dark fermion producing the observed excess events in the recoil electron energy. The model can be tested with further data from Xenon-1T and in future experiments such as SuperCDMS.

21 pages, 4 figures, 1 table. Accepted for publication in JHEP

References in corpus (41)

• Excess Electronic Recoil Events in XENON1T
• Constraints on sub-GeV hidden sector gauge bosons from a search for heavy neutrino decays
• PAMELA Positron Excess as a Signal from the Hidden Sector
• Stellar Recipes for Axion Hunters
• Revisiting the axion bounds from the Galactic white dwarf luminosity function
• Boosted Dark Matter Interpretation of the XENON1T Excess
• Re-examining the Solar Axion Explanation for the XENON1T Excess
• Large Neutrino Magnetic Moments in the Light of Recent Experiments
• Inelastic Dark Matter Electron Scattering and the XENON1T Excess
• Explaining the XENON1T excess with Luminous Dark Matter
• Leptonic New Force and Cosmic-ray Boosted Dark Matter for the XENON1T Excess
• Neutrino self-interactions and XENON1T electron recoil excess
• Electric But Not Eclectic: Thermal Relic Dark Matter for the XENON1T Excess
• Light vector mediators facing XENON1T data
• Can Nonstandard Neutrino Interactions explain the XENON1T spectral excess?
• Dark Matter $Z^{\prime }$ and XENON1T Excess from $U(1{)}_X$ Extended Standard Model
• XENON1T excess in local $Z_2$ DM models with light dark sector
• Inelastic Fermion Dark Matter Origin of XENON1T Excess with Muon $(g-2)$ and Light Neutrino Mass
• XENON1T Anomaly: A Light $Z^{\prime }$
• Feebly Interacting $U(1{)}_{\mathrm{B}-\mathrm{L}}$ Gauge Boson Warm Dark Matter and XENON1T Anomaly
• Self-interacting hidden sector dark matter, small scale galaxy structure anomalies, and a dark force
• Cosmic Imprints of XENON1T Axions
• On-shell mediator dark matter models and the Xenon1T anomaly
• Exothermic Dark Matter for XENON1T Excess
• Shedding New Light on Sterile Neutrinos from XENON1T Experiment
• XENON1T solar axion and the Higgs boson emerging from the dark
• Dark Matter, Muon Anomalous Magnetic Moment and the XENON1T Excess
• What if ALP dark matter for the XENON1T excess is the inflaton
• Impact of loop-induced processes on the boosted dark matter interpretation of the XENON1T excess
• Evidence of a simple dark sector from XENON1T excess
• EFT Approach of Inelastic Dark Matter for Xenon Electron Recoil Detection
• Anomalous $U(1)$ Gauge Bosons as Light Dark Matter in String Theory
• EFT Interpretation of XENON1T Electron Recoil Excess: Neutrinos and Dark Matter
• The KSVZ Axion and Pseudo-Nambu-Goldstone Boson Models for the XENON1T Excess
• A radiative seesaw model linking to XENON1T anomaly
• A solar origin of the XENON1T excess without stellar cooling problems
• Pico-charged particles explaining 511 keV line and XENON1T signal
• Low Scale String Theory Benchmarks for Hidden Photon Dark Matter Interpretations of the XENON1T Anomaly
• Explaining The XENON1T Excess With Light Goldstini Dark Matter
• Interpretation of the XENON1T excess in the model with decaying sterile neutrinos
• New cosmological bounds on axions in the XENON1T window

Cited by in corpus (12)

• A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• Direct detection of dark energy: the XENON1T excess and future prospects
• Self-interacting Inelastic Dark Matter in the light of XENON1T excess
• Pushing the frontier of WIMPy inelastic dark matter: journey to the end of the periodic table
• Exothermic dark mesons in light of electron recoil excess at XENON1T
• Resolving XENON Excess With Decaying Cold Dark Matter
• Explorations of pseudo-Dirac dark matter having keV splittings and interacting via transition electric and magnetic dipole moments
• A decaying neutralino as dark matter and its gamma ray spectrum
• Hidden sectors and a multi-temperature universe
• Inelastic dark matter, small scale problems, and the XENON1T excess
• Interpretation of the XENON1T excess in the model with decaying sterile neutrinos
• Inelastic Dirac Dark Matter