33RD INTERNATIONAL COSMIC RAY CONFERENCE, RIO DE JANEIRO 2013 THE ASTROPARTICLE PHYSICS CONFERENCE Atmospheric neutrinos at high energy

Email of contact person Abstract: Finding neutrinos of astrophysical origin requires a good understanding of the flux of atmospheric neutrinos up to the PeV energy range. Of particular importance is the level of prompt leptons, and the effect of the knee in the primary spectrum of nucleons. In this paper we describe techniques for combining Monte Carlo simulations with analytic approximations to overcome the technical problem of low statistics in the Monte Carlo. We will present preliminary results of our calculations based on the latest version of the SIBYLL event generator with charm