The Decay of Tau Leptons Produced in Neutrino-Nucleon Scatterings

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Energy and angular distributions of the tau decay products in the CERN-to-Gran Sasso ντ appearance experiments are studied for the decay modes τ→πν and τ→ lνν (l=e or mu). We find that the decay particle distributions in the laboratory frame are significantly affected by the tau polarization. Rather strong azimuthal asymmetry of pi- and l- about the tau momentum axis is predicted, which may have observable consequences even at small statistics experiments.