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Gamma-ray Limits on Neutrino Lines


Queiroz,  Farinaldo
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;


Yaguna Toro,  Carlos Esteban
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Queiroz, F., Yaguna Toro, C. E., & Weniger, C. (2016). Gamma-ray Limits on Neutrino Lines. Journal of Cosmology and Astroparticle Physics, 2016(05): 050. doi:10.1088/1475-7516/2016/05/050.

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.