Revising inelastic dark matter direct detection by including the cosmic ray acceleration

Abstract

The null signal from collider and dark matter (DM) direct detector experiments makes the interaction between DM and visible matter too small to reproduce the correct relic density for many thermal DM models. The remaining parameter space indicates that two almost degenerated states in the dark sector, the inelastic DM scenario, can co-annihilate in the early universe to produce the correct relic density. Regarding the direct detection of the inelastic DM scenario, the virialized DM component from the nearby halo is nonrelativistic and not able to excite the DM ground state, even if the relevant couplings can be considerable. Thus, a DM with a large mass splitting can evade traditional virialized DM direct detection. In this study, we connect the concept of cosmic-ray accelerated DM in our Milky Way and the direct detection of inelastic scattering in underground detectors to explore spectra that result from several interaction types of the inelastic DM. We find that the mass splitting $\delta <\mathcal{O}(1\mathrm{MeV})$ can still be reachable for cosmic ray accelerated DM with mass range $1\mathrm{MeV}<m_{{\chi }_1}<100\mathrm{GeV}$ and sub-GeV light mediator using the latest PandaX-4T data, even though we conservatively use the astrophysical parameter (effective length) $D_{\mathrm{eff}}=1$ kpc.

38 pages, 12 figures, JHEP accepted version

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• Revisiting the Fermionic Dark Matter Absorption on Electron Target
• Searching for Afterglow: Light Dark Matter Boosted by Supernova Neutrinos
• An Improved Bound on Accelerated Light Dark Matter
• Accelerated Light Dark Matter-Earth Inelastic Scattering in Direct Detection
• Starburst Nuclei as Light Dark Matter Laboratories
• The Morphology of Exciting Dark Matter and the Galactic 511 keV Signal
• Plasmon-enhanced Direct Detection Method for Boosted sub-MeV Dark Matter
• Signatures of afterglows from light dark matter boosted by supernova neutrinos in current and future large underground detectors
• XQC and CSR constraints on strongly interacting dark matter with spin and velocity dependent cross sections
• Supernova-Neutrino-Boosted Dark Matter from All Galaxies
• Directional direct detection of light dark matter up-scattered by cosmic rays from direction of the Galactic center
• Coherence in scattering of massive weakly interacting neutral particles off nuclei
• Inelastic Scattering of Dark Matter with Heavy Cosmic Rays
• Investigating the collinear splitting effects of boosted dark matter at neutrino detectors
• Nuclear and electron scattering by neutrinos and dark matter in condensed systems
• Soft Scattering Evaporation of Dark Matter Subhalos by Inner Galactic Gases
• Semi-Visible Dark Photon Phenomenology at the GeV Scale
• Mapping the evolution of supernova-neutrino-boosted dark matter within the Milky Way