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Evidence for a break in the spectrum of astrophysical neutrinos

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arxiv 1611.07905 v2 pith:PNJBYIQH submitted 2016-11-23 astro-ph.HE hep-ph

Evidence for a break in the spectrum of astrophysical neutrinos

classification astro-ph.HE hep-ph
keywords astrophysicaleventsicecubeneutrinosbreakcollaborationevidencefits
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The announcement by the IceCube Collaboration of the observation of 53 astrophysical neutrino candidates in the energy range 0.03 \alt E_\nu/PeV \alt 2 has been greeted with a great deal of justified excitement. Herein we provide fits of single and a broken power-law energy-spectra to these high-energy starting events (HESEs). By comparing our statistical results from fits to (background-free) shower HESE data with the spectral shape of muon neutrinos recently reported by the IceCube Collaboration, we show that there is (3 \sigma) evidence for a break in the spectrum of astrophysical neutrinos. After that we use the fitted result to predict the rate of Glashow events (in the ~ 6.3 PeV region) and double-bang tau neutrino events (in the PeV region) just at the threshold of IceCube detection.

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