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.
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Implications of a Cosmogenic Origin of KM3-230213A for Ultra-High-Energy Protons
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.