Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV–10 PeV

R. Abbasi; M. Ackermann; J. Adams; S. K. Agarwalla; M. Ahlers; J M Alameddine; S Ali; N. M. Amin; M Hostert; IceCube Collaborators

doi:10.48550/arxiv.2507.22233

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Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV–10 PeV

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Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV–10 PeV

R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, M. Ahlers, J M Alameddine, S Ali, N. M. Amin, M Hostert and IceCube Collaborators

ArXiv.org

Cornell University

07/29/2025

DOI: 10.48550/arxiv.2507.22233

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Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

We report improved measurements of the all flavor astrophysical neutrino spectrum with IceCube by combining complementary neutrino samples in two independent analyses. Both analyses show evidence of a harder spectrum at energies below $\sim$30~TeV compared to higher energies where the spectrum is well characterized by a power law. The spectrum is better described by a log parabola or a broken power law, the latter being the preferred model. Both, however, reject a single power law over an energy range 5~TeV-10~PeV with a significance $>4σ$, providing new constraints on properties of cosmic neutrino sources.

Physics - High Energy Astrophysical Phenomena

Details

Title: Subtitle: Evidence for a Spectral Break or Curvature in the Spectrum of Astrophysical Neutrinos from 5 TeV–10 PeV
Creators: R. Abbasi - Loyola University Chicago
M. Ackermann - Deutsches Elektronen-Synchrotron DESY
J. Adams - University of Canterbury
S. K. Agarwalla - University of Wisconsin–Madison
M. Ahlers - University of Copenhagen
J M Alameddine - TU Dortmund University
S Ali - University of Kansas
N. M. Amin - University of Delaware
M Hostert
IceCube Collaborators
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2507.22233
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 07/29/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984945910502771

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