Combined constraints on the diffuse flux of cosmic neutrinos between 10^16 eV and 10^26 eV
Abstract
Experimental constraints on the diffuse neutrino flux above the PeV range have been obtained with Cherenkov neutrino telescopes, air-shower arrays, radio detectors in and above polar ice, and radio observations of the Moon. Published results use different flavor, energy-bin, and statistical conventions, so their flux limits cannot be combined directly. We reconstruct energy-dependent exposures of the published searches and place them in a common convention for the total all-flavor ν+ν̅ flux over 1016-1026 eV. Published event counts and expected backgrounds are combined with a Poisson likelihood, and 90% C.L. quasi-differential limits are obtained for one-decade Eν−1 test spectra using a one-sided profile-likelihood construction. Folding theoretical spectra of cosmogenic neutrinos and selected new-physics scenarios with the combined energy-dependent exposure yields constraints on their flux normalizations. This homogeneous analysis provides a reproducible observational benchmark across ten decades in neutrino energy and a common reference for current and projected searches.
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BibTeX
@misc{troitsky2026combined,
title = {{Combined constraints on the diffuse flux of cosmic neutrinos between 10^16 eV and 10^26 eV}},
author = {S. V. Troitsky},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.36632},
eprint = {2609.36632},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.36632},
}
RIS
TY - UNPB
TI - Combined constraints on the diffuse flux of cosmic neutrinos between 10^16 eV and 10^26 eV
AU - S. V. Troitsky
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.36632
UR - https://arxiv.org/abs/2609.36632
AB - Experimental constraints on the diffuse neutrino flux above the PeV range have been obtained with Cherenkov neutrino telescopes, air-shower arrays, radio detectors in and above polar ice, and radio observations of the Moon. Published results use different flavor, energy-bin, and statistical conventions, so their flux limits cannot be combined directly. We reconstruct energy-dependent exposures of the published searches and place them in a common convention for the total all-flavor ν+ν̅ flux over 10^16-10^26 eV. Published event counts and expected backgrounds are combined with a Poisson likelihood, and 90% C.L. quasi-differential limits are obtained for one-decade E_ν^−1 test spectra using a one-sided profile-likelihood construction. Folding theoretical spectra of cosmogenic neutrinos and selected new-physics scenarios with the combined energy-dependent exposure yields constraints on their flux normalizations. This homogeneous analysis provides a reproducible observational benchmark across ten decades in neutrino energy and a common reference for current and projected searches.
ER -