KM3NeT reports the first astrophysical neutrino above 100 PeV, reviews tensions with other observatories, and explores source scenarios using the inferred diffuse flux.
2502.08387
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A single high-energy neutrino event implies that UHE proton sources must evolve strongly like high-luminosity AGN, but this is disfavored when including null results from other detectors, with proton fraction constrained to about 20% at 20 EeV by composition data.
Minimal UHECR flux models from the Telescope Array predict cosmogenic neutrino fluxes consistent with the KM3-230213A event at the 2σ level.
Phenomenological study predicting incomplete tau polarization at FASER2, observable neutrino and muon trident processes, and contributions to hadron structure from IceCube neutrino events.
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Lepton interactions from GeV to EeV
Phenomenological study predicting incomplete tau polarization at FASER2, observable neutrino and muon trident processes, and contributions to hadron structure from IceCube neutrino events.