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Title: Multi-PeV Signals from a New Astrophysical Neutrino Flux beyond the Glashow Resonance

Journal Article · · Physical Review Letters
 [1];  [2]
  1. Stanford Univ., CA (United States). Dept. of Physics and Kavli Inst. for Particle Astrophysics and Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Johannes Gutenberg Univ., Mainz (Germany). PRISMA Cluster of Excellence and Mainz Inst. for Theoretical Physics

The IceCube neutrino discovery was punctuated by three showers with Eν ≈ 1–2 PeV. Interest is intense in possible fluxes at higher energies, though a deficit of Eν ≈ 6 PeV Glashow resonance events implies a spectrum that is soft and/or cutoff below ~ few PeV. However, IceCube recently reported a through-going track depositing 2.6 ± 0.3 PeV. A muon depositing so much energy can imply Eνμ ≳ 10 PeV. Alternatively, we find a tau can deposit this much energy, requiring Eντ ~ 10× higher. Here, we show that extending soft spectral fits from TeV-PeV data is unlikely to yield such an event, while an ~ Ev-2 flux predicts excessive Glashow events. These instead hint at a new flux, with the hierarchy of νμ and ντ energies implying astrophysical neutrinos at Eν ~ 100 PeV if a tau. We address implications for ultrahigh-energy cosmic-ray and neutrino origins.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; Univ. of Washington, Seattle, WA (United States). Inst. for Nuclear Theory (INT); Kavli Foundation; German Research Foundation (DFG); European Research Council (ERC)
Grant/Contract Number:
AC02-76SF00515; EXC-1098; KO 4820/1-1; FOR 2239; 637506
OSTI ID:
1460678
Alternate ID(s):
OSTI ID: 1454371
Journal Information:
Physical Review Letters, Vol. 120, Issue 24; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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  • Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) https://doi.org/10.22323/1.390.0116
conference December 2020
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Cited By (4)

Multi-messenger astrophysics journal October 2019
Studying low x structure function models with astrophysical tau neutrinos journal October 2019
Hunting the Glashow resonance with PeV neutrino telescopes journal March 2020
Search for high-energy neutrino emission from radio-bright AGN journal June 2021

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