Azimuthal asymmetry in cosmic-ray boosted dark matter flux

Abstract

Light halo dark matter (DM) particles up-scattered by high-energy cosmic rays (referred to as CRDM) can be energetic and become detectable at conventional DM and neutrino experiments. We show that the CRDM flux has a novel and detectable morphological feature. Unlike most of the recently proposed boosted DM (BDM) models which predict azimuthally symmetric DM fluxes around the Galactic Center, the CRDM flux breaks the azimuthal symmetry significantly. Using cosmic-ray electron distribution in the whole Galaxy and optimized search region in the sky according to the morphology of the CRDM flux, we derive so far the most stringent constraints on the DM-electron scattering cross section from the Super-Kamiokande (SK) IV data, which improves the previous constraints from the SK-IV full-sky data by more than an order of magnitude. Based on the improved constraints, we predict that the azimuthal symmetry-breaking effect can be observed in the future Hyper-Kamiokande experiment at $\sim 3\sigma$ level.

5 pages, 4 figures + appendix. We comment that the BBN cosntraints on CR-boostded DM are always model dependent, and cannot be naively applied to light sub-MeV DM. Version accepted by Phys. Rev. D

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• XQC and CSR constraints on strongly interacting dark matter with spin and velocity dependent cross sections
• New constraints on cosmic ray-boosted dark matter from the LUX-ZEPLIN experiment
• Search for Cosmic-ray Boosted Sub-MeV Dark-Matter-Electron Scattering in PandaX-4T
• Directional Sensitivity of the NEWSdm Experiment to Cosmic Ray Boosted Dark Matter
• Boosted Dark Matter From Centaurus A and Its Detection
• Supernova-Neutrino-Boosted Dark Matter from All Galaxies
• Prospects of detecting cosmic ray up-scattered dark matter with DUNE
• Directional direct detection of light dark matter up-scattered by cosmic rays from direction of the Galactic center
• Mapping the evolution of supernova-neutrino-boosted dark matter within the Milky Way