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

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