Cosmic-ray muons at ultrahigh energies

Fluxes of cosmic-ray muons were estimated over the energy range extending up to 10(10) GeV. Data on the production of pions; kaons; eta, eta', rho, omega, and I center dot mesons; charmed particles; and J/psi mesons from accelerator experiments devoted to studying interactions between nucleons and nuclei of air atoms up to nucleon energies of about 2 x 10(4) GeV were used in respective calculations. At higher energies, use was made of the results obtained by calculating cross sections for the production of charmed particles and J/psi mesons on the basis of QCD models. It is shown that, in interpreting experimental data on extensive air showers, the production of both charmed particles and J/psi mesons in the Earth's atmosphere must be taken into account.