KM3-230213A: The Highest-Energy Cosmic Neutrino
Abstract
High-energy neutrinos provide a unique probe of the most extreme non-thermal processes in the Universe. The detection of the ultra-high-energy neutrino event KM3-230213A by the KM3NeT neutrino telescope, with an inferred parent-neutrino energy of O(10^17 eV), represents a major step forward in neutrino astronomy. In this review, we summarize the main properties of the event and discuss its interpretation within different astrophysical and cosmological scenarios, including active galactic nuclei, transient sources, and cosmogenic neutrinos, highlighting the role of multi-messenger constraints. Despite extensive follow-up observations, no unambiguous electromagnetic counterpart has been identified, and the event remains in tension with the absence of comparable detections in other experiments. This situation leaves open the possibility of more complex source scenarios or contributions from physics beyond the Standard Model. We also discuss the implications for the ultra-high-energy neutrino landscape and the prospects for future observations with next-generation detectors. KM3-230213A provides a unique opportunity to probe particle acceleration and neutrino production at energies far beyond the reach of terrestrial experiments.
Versions
Related
- Probing Lorentz Invariance Violation in Cosmogenic Neutrino Propagation with KM3-230213A
- Distinguishing the origin of cosmic birefringence: dark energy, dark matter, and neutrino asymmetry
- Cosmogenic neutrinos from FRII galaxies as potential origin of the ultra-high-energy KM3-230213A event
- Global Spline Fit: A unified data-driven view of the cosmic-ray spectrum and mass composition from GeV to the highest energies
- Space-based Cosmic Neutrino Measurements
BibTeX
@misc{distefano2026km3230213a,
title = {{KM3-230213A: The Highest-Energy Cosmic Neutrino}},
author = {Carla Distefano},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40053},
eprint = {2610.40053},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40053},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - KM3-230213A: The Highest-Energy Cosmic Neutrino
AU - Carla Distefano
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40053
UR - https://arxiv.org/abs/2610.40053
AB - High-energy neutrinos provide a unique probe of the most extreme non-thermal processes in the Universe. The detection of the ultra-high-energy neutrino event KM3-230213A by the KM3NeT neutrino telescope, with an inferred parent-neutrino energy of O(10^17 eV), represents a major step forward in neutrino astronomy. In this review, we summarize the main properties of the event and discuss its interpretation within different astrophysical and cosmological scenarios, including active galactic nuclei, transient sources, and cosmogenic neutrinos, highlighting the role of multi-messenger constraints. Despite extensive follow-up observations, no unambiguous electromagnetic counterpart has been identified, and the event remains in tension with the absence of comparable detections in other experiments. This situation leaves open the possibility of more complex source scenarios or contributions from physics beyond the Standard Model. We also discuss the implications for the ultra-high-energy neutrino landscape and the prospects for future observations with next-generation detectors. KM3-230213A provides a unique opportunity to probe particle acceleration and neutrino production at energies far beyond the reach of terrestrial experiments.
ER -