Atmospheric Dark Matter and Xenon1T Excess

Abstract

Very recently, the Xenon1T collaboration has reported an intriguing electron recoil excess, which may imply for light dark matter. In order to interpret this anomaly, we propose the atmospheric dark matter (ADM) from the inelastic collision of cosmic rays (CRs) with the atmosphere. Due to the boost effect of high energy CRs, we show that the light ADM can be fast-moving and successfully fit the observed electron recoil spectrum through the ADM-electron scattering process. Meanwhile, our ADM predicts the scattering cross section ${\sigma }_e\sim \mathcal{O}(10^{-38}-10^{-39}$) cm${}^2$, and thus can evade other direct detection constraints. The search for light meson rare decays, such as $η\to π+ \slashed E_T$, would provide a complementary probe of our ADM in the future.

arXiv comment7 pages, 5 figures, discussions and references added, version accepted by PRD

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• A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• Exploring New Physics with O(keV) Electron Recoils in Direct Detection Experiments
• Direct detection of dark energy: the XENON1T excess and future prospects
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