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Update on decaying and annihilating heavy dark matter with the 6-year IceCube HESE data

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arxiv 1903.12623 v2 pith:GJVIYD5L submitted 2019-03-29 hep-ph astro-ph.HEhep-ex

classification hep-phastro-ph.HEhep-ex
keywords datadarkmatterastrophysicalheseyeardecayfind
verification ladder T0 review T1 audit T2 compute T3 formal

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In view of the IceCube's 6-year high-energy starting events (HESE) sample, we revisit the possibility that the updated data may be better explained by a combination of neutrino fluxes from dark matter decay and an isotropic astrophysical power-law than purely by the latter. We find that the combined two-component flux qualitatively improves the fit to the observed data over a purely astrophysical one, and discuss how these updated fits compare against a similar analysis done with the 4-year HESE data. We also update fits involving dark matter decay via multiple channels, without any contribution from the astrophysical flux. We find that a DM-only explanation is not excluded by neutrino data alone. Finally, we also consider the possibility of a signal from dark matter annihilations and perform analogous analyses to the case of decays, commenting on its implications.

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Cited by 3 Pith papers

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    hep-ph 2025-09 conditional novelty 5.0 of 10

    Tibet ASγ and LHAASO-KM2A diffuse gamma-ray data exclude decaying dark matter lifetimes below about 10^28 seconds for masses around 10^6-10^9 GeV, for many Standard Model final states.

  3. Fermion Dark Matter and Radiative Neutrino Masses from Spontaneous Lepton Number Breaking

    hep-ph 2019-08 conditional novelty 4.0 of 10

    In the scotogenic model with spontaneous lepton number breaking, the lightest heavy Majorana neutrino can be a sub-TeV dark matter particle with the correct relic abundance in three mass windows, while evading current...

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