Model-independent dark matter annihilation bound from the diffuse gamma ray flux

Abstract

An upper limit on the total annihilation cross section of dark matter (DM) has recently been derived from the observed atmospheric neutrino background. We show that comparable bounds are obtained for DM masses around the TeV scale by observations of the diffuse gamma-ray flux by EGRET, because electroweak bremsstrahlung leads to non-negligible electromagnetic branching ratios, even if DM particles only couple to neutrinos at tree level. A better mapping and the partial resolution of the diffuse gamma-ray background into astrophysical sources by the GLAST satellite will improve this bound in the near future.

4 pages revtex, 2 figures; minor changes, references added, conclusions unchanged; Matches published version

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• MadDM v.3.0: a Comprehensive Tool for Dark Matter Studies
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• Gamma ray constraints on Decaying Dark Matter
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• Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays
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• Electroweak Bremsstrahlung in Dark Matter Annihilation
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• Dark Matter Annihilation Signatures from Electroweak Bremsstrahlung
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• Galactic PeV neutrinos from dark matter annihilation
• Probing Leptophilic Dark Sectors with Hadronic Processes
• On the effective operators for Dark Matter annihilations
• Determining the WIMP mass using the complementarity between direct and indirect searches and the ILC
• Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection
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• Dark matter component decaying after recombination: constraints from diffuse gamma-ray and neutrino flux measurements
• Probing New Physics with Astrophysical Neutrinos
• Radio Signal by Galactic Dark Matter
• Likely Dominance of WIMP Annihilation to Fermion Pair + W/Z