Spectral analysis of the high-energy IceCube neutrinos
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Spectral analysis of the high-energy IceCube neutrinos

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Spectral analysis of the high-energy IceCube neutrinos

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dc.contributor.author Palomares Ruiz, Sergio
dc.contributor.author Vincent, Aaron C.
dc.contributor.author Mena Requejo, Olga
dc.date.accessioned 2016-11-18T10:58:59Z
dc.date.available 2016-11-18T10:58:59Z
dc.date.issued 2015
dc.identifier.uri http://hdl.handle.net/10550/56111
dc.description.abstract A full energy and flavor-dependent analysis of the three-year high-energy IceCube neutrino events is presented. By means of multidimensional fits, we derive the current preferred values of the high-energy neutrino flavor ratios, the normalization and spectral index of the astrophysical fluxes, and the expected atmospheric background events, including a prompt component. A crucial assumption resides on the choice of the energy interval used for the analyses, which significantly biases the results. When restricting ourselves to the similar to 30 TeV-3 PeV energy range, which contains all the observed IceCube events, we find that the inclusion of the spectral information improves the fit to the canonical flavor composition at Earth, (1: 1: 1)(circle plus), with respect to a single-energy bin analysis. Increasing both the minimum and the maximum deposited energies has dramatic effects on the reconstructed flavor ratios as well as on the spectral index. Imposing a higher threshold of 60 TeV yields a slightly harder spectrum by allowing a larger muon neutrino component, since above this energy most atmospheric tracklike events are effectively removed. Extending the high-energy cutoff to fully cover the Glashow resonance region leads to a softer spectrum and a preference for tau neutrino dominance, as none of the expected electron (anti) neutrino induced showers have been observed so far. The lack of showers at energies above 2 PeV may point to a broken power-law neutrino spectrum. Future data may confirm or falsify whether the recently discovered high-energy neutrino fluxes and the long-standing detected cosmic rays have a common origin.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2015, vol. 91, num. 10, p. 103008
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Palomares Ruiz, Sergio Vincent, Aaron C. Mena Requejo, Olga 2015 Spectral analysis of the high-energy IceCube neutrinos Physical Review D 91 10 103008
dc.subject Física
dc.title Spectral analysis of the high-energy IceCube neutrinos
dc.type info:eu-repo/semantics/article
dc.date.updated 2016-11-18T10:58:59Z
dc.identifier.doi https://doi.org/10.1103/PhysRevD.91.103008
dc.identifier.idgrec 108163

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