Cosmic rays above the ankle from Z-bursts

Details Cosmic rays above the ankle from Z-bursts Cosmic rays above the ankle from Z-bursts

2002-01-29

arxiv.org/abs/hep-ph/0201273v4

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages including 4 figures, changed figures and added references

Scientific paper

Neutrinos from far away sources annihilating at the Z resonance on relic neutrinos may give origin to the ultrahigh-energy cosmic rays. Here we present predictions of this mechanism with relic neutrinos lighter than 1 eV, which do not gravitationally cluster. We show that not only the super GZK events, but the "ankle" and all events above it can be accounted for. Most primaries above the ankle are predicted to be nucleons up to $10^{20.0}$ eV and photons at higher energies. We also find an accumulation at the GZK cutoff energy, a hint of which can be seen in the data.

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