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Characterization of the Three-Flavor Composition of Cosmic Neutrinos with IceCube
Preprint

Characterization of the Three-Flavor Composition of Cosmic Neutrinos with IceCube

R Abbasi, M Ackermann, J Adams, S. K Agarwalla, J. A Aguilar, M Ahlers, J. M Alameddine, S Ali, N. M Amin, K Andeen, …
ArXiv.org
28 Oct 2025
url
https://doi.org/10.48550/arxiv.2510.24957View
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Abstract

Physics - High Energy Astrophysical Phenomena Physics - High Energy Physics - Experiment Physics - High Energy Physics - Phenomenology
Neutrinos oscillate over cosmic distances. Using 11.4 years of IceCube data, the flavor composition of the all-sky neutrino flux from 5\,TeV--10\,PeV is studied. We report the first measurement down to the$\mathcal{O}$ (TeV) scale using events classified into three flavor-dependent morphologies. The best fit flavor ratio is$f_e:f_μ:f_τ\,=\,0.30:0.37:0.33$ , consistent with the standard three-flavor neutrino oscillation model. Each fraction is constrained to be$>0$at$>$90\% confidence level, assuming a broken power law for cosmic neutrinos. We infer the flavor composition of cosmic neutrinos at their sources, and find production via neutron decay lies outside the 99\% confidence interval.

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