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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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

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

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