Improved measurements of the TeV--PeV extragalactic neutrino spectrum from joint analyses of IceCube tracks and cascades

R. Abbasi; M. Ackermann; J. Adams; S. K. Agarwalla; J. A. Aguilar; M. Ahlers; J M Alameddine; S Ali; M Hostert; IceCube Collaboration

doi:10.48550/arxiv.2507.22234

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Improved measurements of the TeV--PeV extragalactic neutrino spectrum from joint analyses of IceCube tracks and cascades

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Improved measurements of the TeV--PeV extragalactic neutrino spectrum from joint analyses of IceCube tracks and cascades

R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M. Ahlers, J M Alameddine, S Ali, M Hostert and IceCube Collaboration

ArXiv.org

Cornell University

07/29/2025

DOI: 10.48550/arxiv.2507.22234

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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

The IceCube South Pole Neutrino Observatory has discovered the presence of a diffuse astrophysical neutrino flux at energies of TeV and beyond using neutrino induced muon tracks and cascade events from neutrino interactions. We present two analyses sensitive to neutrino events in the energy range 1 TeV to 10 PeV, using more than 10 years of IceCube data. Both analyses consistently reject a neutrino spectrum following a single power-law with significance > 4 σ in favor of a broken power law. We describe the methods implemented in the two analyses, the spectral constraints obtained, and the validation of the robustness of the results. Additionally, we report the detection of a muon neutrino in the MESE sample with an energy of 11.4+2.46 −2.53 PeV, the highest energy neutrino observed by IceCube to date. The results presented here show insights into the spectral shape of astrophysical neutrinos, which has important implications for inferring their production processes in a multi-messenger picture

Physics - High Energy Astrophysical Phenomena

Details

Title: Subtitle: Improved measurements of the TeV--PeV extragalactic neutrino spectrum from joint analyses of IceCube tracks and cascades
Creators: R. Abbasi - Loyola University Chicago
M. Ackermann - Deutsches Elektronen-Synchrotron DESY
J. Adams - University of Canterbury
S. K. Agarwalla - University of Wisconsin–Madison
J. A. Aguilar - Université Libre de Bruxelles
M. Ahlers - University of Copenhagen
J M Alameddine - TU Dortmund University
S Ali - University of Kansas
M Hostert (Contributor)
IceCube Collaboration
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2507.22234
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 07/29/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984946619602771

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