Directional direct detection of light dark matter up-scattered by cosmic rays from direction of the Galactic center

Abstract

Dark matter with MeV scale mass is difficult to detect with standard direct search detectors. However, they can be searched for by considering the up-scattering of kinetic energies by cosmic rays. Because the dark matter density is higher in the central region of the Galaxy, the up-scattered dark matter will arrive at Earth from the direction of the Galactic center. Once the dark matter is detected, we can expect to recognize this feature by directional direct detection experiments. In this study, we simulate the nuclear recoils of the up-scattered dark matter and quantitatively reveal that a large amount of this type of dark matter is arriving from the direction of the Galactic center. Also, we have shown that the characteristic signatures of the up-scattered dark matter can be verified with more than 5$\sigma$ confidence levels for the assumed target atoms and future upgrades to directional detectors.

arXiv comment17 pages, 64 figures

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• Directional Sensitivity of the NEWSdm Experiment to Cosmic Ray Boosted Dark Matter
• Prospects of detecting cosmic ray up-scattered dark matter with DUNE
• Inelastic Scattering of Dark Matter with Heavy Cosmic Rays
• Directional Direct Detection of MeV Scale Boosted Dark Matter in Two Component Dark Matter Scenario via Dark Photon Interaction