Which is the flavor of cosmic neutrinos seen by IceCube?

Abstract

We analyze the high-energy neutrino events observed by IceCube, aiming to probe the initial flavor of cosmic neutrinos. We study the track-to-shower ratio of the subset with energy above 60 TeV, where the signal is expected to dominate and show that different production mechanisms give rise to different predictions even accounting for the uncertainties due to neutrino oscillations. We include for the first time the passing muons observed by IceCube in the analysis. They corroborate the hypotheses that cosmic neutrinos have been seen and their flavor matches expectations.

4 pages, 1 figure

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• The IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
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• Boosted Dark Matter in IceCube and at the Galactic Center
• The Future of High-Energy Astrophysical Neutrino Flavor Measurements
• Sterile Neutrinos and Flavor Ratios in IceCube
• On the IceCube spectral anomaly
• Probing decaying heavy dark matter with the 4-year IceCube HESE data
• Dark Matter interpretation of low energy IceCube MESE excess
• Unified thermal model for photohadronic neutrino production in astrophysical sources
• Bump-hunting in the diffuse flux of high-energy cosmic neutrinos
• Astronomy with energy dependent flavour ratios of extragalactic neutrinos
• The flavor composition of ultra-high-energy cosmic neutrinos: measurement forecasts for in-ice radio-based EeV neutrino telescopes
• Unveiling the nature of galactic TeV sources with IceCube results
• Pseudo-Dirac Neutrinos and Relic Neutrino Matter Effect on the High-energy Neutrino Flavor Composition
• Setting an upper limit for the total TeV neutrino flux from the disk of our Galaxy
• Two-detector flavor sensitivity to ultra-high-energy cosmic neutrinos
• Inferring astrophysical neutrino sources from the Glashow resonance
• Flavor Matters, but Matter Flavors: Matter Effects on Flavor Composition of Astrophysical Neutrinos
• Spread Complexity of High Energy Neutrino Propagation over Astrophysical Distances
• Challenge to Anomalous Phenomena in Solar Neutrino