Neutrino interactions in oscillation experiments

We calculate the neutrino induced cross sections relevant for oscillation experiments, including the $\tau$-lepton threshold for quasielastic, resonance and deep-inelastic scattering. In addition to threshold effects, we include nuclear corrections for heavy targets which are moderate for quasielastic and large for single pion production. The nuclear effects for deep-inelastic reactions are small. We present cross sections together with their nuclear corrections for various channels which are useful for interpreting the experimental results and for determining parameters of the neutrino sector. Finally, we calculate the $\tau$-lepton event rates for the OPERA LBL experiment.