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Percolation Effects in Very High Energy Cosmic Rays

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arxiv hep-ph/0507227 v2 pith:SLBHGVIN submitted 2005-07-19 hep-ph

classification hep-ph
keywords energyhighcosmicinelasticitypercolationwillaboveargue
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abstract

Most QCD models of high energy collisions predict that the inelasticity $K$ is an increasing function of the energy. We argue that, due to percolation of strings, this behaviour will change and, at $\sqrt{s} \simeq 10^4$ GeV, the inelasticity will start to decrease with the energy. This has straightforward consequences in high energy cosmic ray physics: 1) the relative depth of the shower maximum $\bar{X}$ grows faster with energy above the knee; 2) the energy measurements of ground array experiments at GZK energies could be overestimated.

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