The low-muon-number tail slope in simulated air showers is presented as a direct observable for the high-energy neutral-pion spectrum of the first proton-air interaction.
Probing the energy spectrum of hadrons in proton air interactions at ultrahigh energies through the fluctuations of the muon content of extensive air showers
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abstract
We demonstrate that the shower-to-shower fluctuations of the muon content of extensive air showers correlate with the fluctuations of a variable of the first interaction of Ultra High Energy Cosmic Rays, which is computed from the fraction of energy carried by the hadrons that sustain the hadronic cascade. The influence of subsequent stages of the shower development is found to play a sub-dominant role. As a consequence, the shower-to-shower distribution of the muon content is a direct probe of the hadron energy spectrum of interactions beyond 100 TeV center of mass energies.
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Probing the high energy spectrum of neutral pions in ultra-high energy proton-Air interactions
The low-muon-number tail slope in simulated air showers is presented as a direct observable for the high-energy neutral-pion spectrum of the first proton-air interaction.