Gamma-ray Limits on Neutrino Lines

Abstract

MMonochromatic neutrinos from dark matter annihilations ($\chi \chi \to \nu \bar{\nu }$) are always produced in association with a gamma-ray spectrum generated by electroweak bremsstrahlung. Consequently, these neutrino lines can be searched for not only with neutrino detectors but also indirectly with gamma-ray telescopes. Here, we derive limits on the dark matter annihilation cross section into neutrinos based on recent Fermi-LAT and HESS data. We find that, for dark matter masses above 200 GeV, gamma-ray data actually set the most stringent constraints on neutrino lines from dark matter annihilation and, therefore, an upper bound on the dark matter total annihilation cross section. In addition, we point out that gamma-ray telescopes, unlike neutrino detectors, have the potential to distinguish the flavor of the final state neutrino. Our results indicate that we have already entered into a new era where gamma-ray telescopes are more sensitive than neutrino detectors to neutrino lines from dark matter annihilation.

5 pages, 3 figures. It matches published version

References in corpus (7)

• Weak Corrections are Relevant for Dark Matter Indirect Detection
• Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects
• Neutrino Constraints on the Dark Matter Total Annihilation Cross Section
• Upper Bound on the Dark Matter Total Annihilation Cross Section
• Model-independent dark matter annihilation bound from the diffuse gamma ray flux
• Electroweak Bremsstrahlung in Dark Matter Annihilation
• Enhancing Dark Matter Annihilation into Neutrinos

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