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arxiv: hep-ph/0310054 · v1 · submitted 2003-10-06 · ✦ hep-ph · astro-ph· gr-qc· hep-ex· hep-th

Footprints of Super-GZK Cosmic Rays in the Pilliga State Forest

classification ✦ hep-ph astro-phgr-qchep-exhep-th
keywords cosmicenergyeventsforesthighpilligare-analyzedsimulations
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High energy cosmic ray data collected by the SUGAR Collaboration in the Pilliga State Forest have been re-analyzed using up-to-date shower simulations. Complete, inclined angle, Monte Carlo simulations reveal 2 events with energies in excess of $7\times 10^{19}$ eV at 95% CL, independent of the choice of hadronic interaction model and of chemical composition of the primary. An additional 3 events, with mean energy $\agt 7\times 10^{19}$ eV, were also re-analyzed in the same manner. A lower bound on the flux at the high end of the spectrum, as observed in the Southern sky, is presented on the basis of our analysis.

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