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The Flavour Composition of the High-Energy IceCube Neutrinos · Around

2015

The Flavour Composition of the High-Energy IceCube Neutrinos

Vincent, Aaron C., Ruiz, Sergio Palomares, Mena, Olga

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We present an in-depth analysis of the flavour and spectral composition of the 36 high-energy neutrino events observed after three years of observation by the IceCube neutrino telescope.

While known astrophysical sources of HE neutrinos are expected to produce a nearly $(1:1:1)$ flavour ratio (electron : muon : tau) of neutrinos at earth, we show that the best fits based on the events detected above $E_\nu \ge 28$ TeV do not necessarily support this hypothesis.
Crucially, the energy range that is considered when analysing the HE neutrino data can have a profound impact on the conclusions.
We highlight two intriguing puzzles: an apparent deficit of muon neutrinos, seen via a deficit of track-like events; and an absence of $\bar \nu_e$'s at high energy, seen as an absence of events near the Glashow resonance.

Built on

H. Athar, M. Jezabek, and O. Yasuda, Effects of neutrino mixing on high-energy cosmic neutrino flux
2000
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J. F. Beacom, N. F. Bell, D. Hooper, S. Pakvasa, and T. J. Weiler, Measuring flavor ratios of high-energy astrophysical neutrinos
2003
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J. F. Beacom, N. F. Bell, D. Hooper, S. Pakvasa, and T. J. Weiler, Decay of high-energy astrophysical neutrinos
2003
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T. Kashti and E. Waxman, Flavoring astrophysical neutrinos: Flavor ratios depend on energy
2005
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W. Rodejohann, Neutrino Mixing and Neutrino Telescopes
2007
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P. Lipari, M. Lusignoli, and D. Meloni, Flavor Composition and Energy Spectrum of Astrophysical Neutrinos
Original
2007
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