Calculation of the TeV prompt muon component in very high energy cosmic ray showers

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Scientific paper

HEMAS-DPM is a Monte Carlo for the simulation of very high energy cosmic ray showers, which includes the DPMJET-II code based on the two component Dual Parton Model. DPMJET-II provides also charm production in agreement with data and, for p_⊥ exceeding 5 GeV/c, with perturbative QCD results in proton-proton interactions. In this respect, a new scheme has been considered for the inclusive production of D mesons at large p_⊥ in hadronic collisions in the framework of perturbative fragmentation functions, allowing an analysis at the Next to Leading Order (NLO) level which goes beyond the fixed O(alpha_s^3) perturbative theory of open charm production. We have applied HEMAS-DPM to the calculation of the prompt muon component for E_mu>= 1 TeV in air showers considering the two extreme cases of primary protons and Fe nuclei.

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