Tau neutrino fluxes from atmospheric charm

Abstract

We present an evaluation of the atmospheric tau neutrino flux in the energy range between $10^2$ and $10^6$ GeV. The main source of tau neutrinos is from charmed particle production and decay. The ${\nu }_{\tau }N\to \tau X$ event rate for a detector with a water equivalent volume of 1 km${}^3$ is on the order of 60-100 events per year for $E_{\tau }>100$ GeV, reducing to 18 events above 1 TeV. Event rates for atmospheric muon neutrino oscillations to tau neutrinos are also evaluated.

8 pages, 1 figure

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