Strongly Interacting Astrophysical Neutrinos
Abstract
The origin and chemical composition of ultra high energy cosmic rays is still an open question in astroparticle physics. The observed large-scale isotropy and also direct composition measurements can be interpreted as an extragalactic proton dominance above the ankle at about 1010 GeV. Photopion production of extragalactic protons in the cosmic microwave background predicts a cutoff at about 5x1010 GeV in conflict with excesses reported by some experiments. In this report we will outline a recent statistical analysis (astro-ph/0506698) of cosmic ray data using strongly interacting neutrinos as primaries for these excesses.
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