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What KM3-230213A event may tell us about the neutrino mass and dark matter

Basabendu Barman1,*, Arindam Das2,3,†, and Prantik Sarmah4,‡

  • *Contact author: basabendu.b@srmap.edu.in
  • †Contact author: arindamdas@oia.hokudai.ac.jp
  • ‡Contact author: prantiksarmah@ihep.ac.cn

Phys. Rev. D 112, 075014 – Published 6 October, 2025

DOI: https://doi.org/10.1103/t58k-sjq5

Abstract

Within the general U(1) scenario, we demonstrate that the ultrahigh-energy neutrinos recently detected by KM3NeT could originate from a decaying right-handed neutrino dark matter, with a mass of 440 PeV. Considering dark matter production via freeze-in, we delineate the parameter space that satisfies the observed relic abundance and also lies within the reach of multiple gravitational wave detectors. Our study provides a testable new physics scenario, enabled by multimessenger astronomy.

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