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Title: Are IceCube neutrinos unveiling PeV-scale decaying dark matter?

Recent observations by IceCube, notably two PeV cascades accompanied by events at energies ∼ (30–400) TeV, are clearly in excess over atmospheric background fluxes and beg for an astroparticle physics explanation. Although some models of astrophysical accelerators can account for the observations within current statistics, intriguing features in the energy and possibly angular distributions of the events make worth exploring alternatives. Here, we entertain the possibility of interpreting the data with a few PeV mass scale decaying dark matter, with lifetime of the order of 10{sup 27} s. We discuss generic signatures of this scenario, including its unique energy spectrum distortion with respect to the benchmark E{sub ν}{sup −2} expectation for astrophysical sources, as well as peculiar anisotropies. A direct comparison with the data show a good match with the above-mentioned features. We further discuss possible future checks of this scenario.
Authors:
 [1] ;  [2]
  1. Instituto de Fisica Gleb Wataghin - UNICAMP, Campinas, SP, 13083-859 (Brazil)
  2. LAPTh, Univ. de Savoie, CNRS, B.P.110, Annecy-le-Vieux, F-74941 (France)
Publication Date:
OSTI Identifier:
22369902
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR DISTRIBUTION; ASTROPHYSICS; DECAY; ENERGY SPECTRA; NEUTRINOS; NONLUMINOUS MATTER; PEV RANGE; STATISTICS; TEV RANGE