We reexamine the charm contribution to atmospheric lepton fluxes in the context of perturbative QCD. We include next-to-leading order corrections and discuss theoretical uncertainties due to the extrapolations of the gluon distributions at small-x. We show that the charm contribution to the atmospheric muon flux becomes dominant over the conventional contribution from pion and kaon decays at energies of about 10^5 GeV. We compare our fluxes with previous calculations.
@article{arxiv.hep-ph/9806428,
title = {Lepton Fluxes from Atmospheric Charm},
author = {L. Pasquali and M. H. Reno and I. Sarcevic},
journal= {arXiv preprint arXiv:hep-ph/9806428},
year = {2008}
}