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We consider the process of scattering of Galactic cosmic-ray electrons andprotons off of dark matter with the radiation of a final-state photon. Thisprocess provides a novel way to search for Galactic dark matter with gammarays. We argue that for a generic weakly interacting massive particle, barringeffects such as co-annihilation or a velocity-dependent cross section, thegamma-ray emission from cosmic-ray scattering off of dark matter is typicallysmaller than that from dark matter pair-annihilation. However, if dark matterparticles cannot pair-annihilate, as is the case for example in asymmetric darkmatter scenarios, cosmic-ray scattering with final state photon emissionprovides a unique window to detect a signal from dark matter with gamma rays.We estimate the expected flux level and its spectral features for a genericsupersymmetric setup, and we also discuss dipolar and luminous dark matter. Weshow that in some cases the gamma-ray emission might be large enough to bedetectable with the Fermi Large Area Telescope.

Cosmic Ray-Dark Matter Scattering: a New Signature of (Asymmetric) Dark Matter in the Gamma Ray Sky