Spencer Chang, Yu Gao, Michael Spannowsky
In this paper, we investigate the gamma ray signal produced from dark matter collisions with high energy cosmic protons. Notably, we extend past results by including important hadronization effects. We find that showering and hadronization, especially from proton remnants that do not participate in hard scattering, produce a large rate of photons in the forward direction that significantly change the photon energy and angular distribution compared to previous results which used only parton level calculations. Due to this enhancement, the gamma ray signal from the nearby active galactic nuclei Centaurus A is be potentially testable in future Fermi-LAT and HESS measurements, for a dark matter mass and coupling consistent with current XENON100 bounds.
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http://arxiv.org/abs/1210.1870
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