Has the GZK suppression been discovered?

Details Has the GZK suppression been discovered? Has the GZK suppression been discovered?

2002-06-22

arxiv.org/abs/hep-ph/0206217v5

Phys.Lett.B556:1-6,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

Editorial changes, including replacing 'cutoff' by 'supression'

Scientific paper

10.1016/S0370-2693(03)00105-9

The energy spectra of ultra high energy cosmic rays reported by the AGASA, Fly's Eye, Haverah Park, HiRes, and Yakutsk experiments are all shown to be in agreement with each other for energies below 10^{20} eV (after small adjustments, within the known uncertainties, of the absolute energy scales). The data from HiRes, Fly's Eye, and Yakutsk are consistent with the expected flux suppression above 5\times 10^{19} eV due to interactions of cosmic rays with the cosmic microwave background, the Greisen-Zatsepin-Kuzmin (GZK) "supression," and are inconsistent with a smooth extrapolation of the observed cosmic ray energy spectrum to energies > 5\times 10^{19}$ eV. AGASA data show an excess of events above 10^{20} eV, compared to the predicted GZK suppression and to the flux measured by the other experiments.

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