PROMPT NU(TAU) FLUXES IN PRESENT AND FUTURE TAU-NEUTRINO EXPERIMENTS

We use a nonperturbative QCD approach, the quark-gluon string model, t o compute the tau-neutrino fluxes produced by fixed target pA collisio ns (where A is a target material) for incident protons of energies ran ging from 120 to 800 GeV. The purpose of this calculation is to estima te in a consistent way the prompt background for the nu(mu)(nu(e)) <-> nu(tau) oscillation search in the on-going nu(mu)(nu(e)) <-> nu(tau) oscillation search experiments CHORUS and NOMAD, as well as the expect ed prompt background in future experiments, such as COSMOS at Fermilab and a possible second-generation nu(mu)(nu(e)) <-> nu(tau) search exp eriment at the CERN SPS. In addition, we compute the number of nu(tau) interactions expected by the experiment E872 at Fermilab.