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Improved measurements of the TeV-PeV extragalactic neutrino spectrum from joint analyses of IceCube tracks and cascades
Journal article   Open access   Peer reviewed

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

IceCube Collaboration, R. Abbasi, Jakob Beise, Olga Botner, Alan Coleman, Christian Glaser, Thorsten Glüsenkamp, Allan Hallgren, Nils Heyer, Erin O'Sullivan, …
Physical review. D, v 113(6), 062002
2026
DOI: https://doi.org/10.1103/4n6v-r7n4
url
https://arxiv.org/abs/2507.22234View
Submitted Open arXiv.org - Non-exclusive license to distribute

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 a significance of >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 medium energy starting events sample, or MESE, 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 multimessenger picture.

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