Decaying dark matter at IceCube and its signature on High Energy gamma experiments

Abstract

The origin of neutrino flux observed in IceCube is still mainly unknown.\nTypically two flux components are assumed, namely: atmospheric neutrinos and an\nunknown astrophysical term. In principle the latter could also contain a\ntop-down contribution coming for example from decaying dark matter. In this\ncase one should also expect prompt and secondary gammas as well. This leads to\nthe possibility of a multimessenger analysis based on the simultaneous\ncomparison of the Dark Matter hypothesis both with neutrino and high energy\ngamma rays data. In this paper, we analyze, for different decaying Dark Matter\nchannels, the 7.5 years IceCube HESE data, and compare the results with\nprevious exclusion limits coming from Fermi data. Finally, we test whether the\nDark Matter hypothesis could be further scrutinised by using forthcoming high\nenergy gamma rays experiments.\n