CHARM PRODUCTION AND HIGH-ENERGY ATMOSPHERIC MUON AND NEUTRINO FLUXES

Production of muons and neutrinos in cosmic ray interactions with the atmosphere has been investigated with Monte Carlo models for hadronic interactions. The resulting conventional muon and neutrino fluxes (fro m pi and K decays) agree well with earlier calculations, whereas our p rompt fluxes from charm decays are significantly lower than earlier es timates. Charm production is mainly considered as a well defined pertu rbative QCD process, but we also investigate a hypothetical non-pertur bative intrinsic charm component in the proton, The lower charm rate i mplies better prospects for detecting very high energy neutrinos from cosmic sources.