@Article{Palomares-Ruiz_etal2015,
author="Palomares-Ruiz, S.
and Vincent, A. C.
and Mena, O.",
title="Spectral analysis of the high-energy IceCube neutrinos",
journal="Physical Review D",
year="2015",
publisher="Amer Physical Soc",
volume="91",
number="10",
pages="103008--28pp",
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.",
optnote="WOS:000355173100001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2242), last updated on Thu, 18 Jun 2015 12:43:55 +0000",
issn="1550-7998",
doi="10.1103/PhysRevD.91.103008",
opturl="http://arxiv.org/abs/1502.02649",
opturl="https://doi.org/10.1103/PhysRevD.91.103008",
archivePrefix="arXiv",
eprint="1502.02649",
language="English"
}