English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The IceCube neutrino discovery was punctuated by three showers with $E_\nu$ ~1-2 PeV. Interest is intense in possible fluxes at higher energies, though amarked deficit of $E_\nu$ ~ 6 PeV Glashow resonance events implies a spectrumthat is soft and/or cutoff below ~few PeV. However, IceCube recently reported athrough-going track event depositing 2.6 $\pm$ 0.3 PeV. A muon depositing somuch energy can imply $E_{\nu_\mu} \gtrsim$ 10 PeV. We show that extending thesoft $E_\nu^{-2.6}$ spectral fit from TeV-PeV data is unlikely to yield such anevent. Alternatively, a tau can deposit this much energy, though requiring$E_{\nu_\tau}$ ~10x higher. We find that either scenario hints at a new flux,with the hierarchy of $\nu_\mu$ and $\nu_\tau$ energies suggesting a windowinto astrophysical neutrinos at $E_\nu$ ~ 100 PeV if a tau. We addressimplications, including for ultrahigh-energy cosmic-ray and neutrino origins.

Multi-PeV Signals from a New Astrophysical Neutrino Flux Beyond the Glashow Resonance