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In this paper, we investigate the gamma ray signal produced from dark mattercollisions with high energy cosmic protons. Notably, we extend past results byincluding important hadronization effects. Showering and hadronization producesa high multiplicity of photons from the decays of hadrons, whose rate is notsuppressed by the fine structure constant. Notably, proton remnants that do notparticipate in hard scattering, can produce a large rate of photons in theforward direction. These effects significantly enhance the photon rate andalter the energy and angular distributions compared to previous results whichused only parton level calculations. Due to this modification, the gamma raysignal from the nearby active galactic nuclei Centaurus A is potentiallytestable in future Fermi-LAT and HESS measurements, for a dark matter mass andcoupling consistent with current XENON100 bounds.

Enhanced Gamma Ray Signals in Cosmic Proton-Wimp Collisions Due to Hadronization