On the role of the ν τ appearance in DUNE in constraining standard neutrino physics and beyond

We consider the νμ→ ντ appearance channel in the future Deep Underground Neutrino Experiment (DUNE) which offers a good statistics of the ντ sample. In order to measure its impact on constraining the oscillation parameters, we consider several assumptions on the efficiency for ντ charged-current signal events (with subsequent τ → e decay) and the related backgrounds and study the effects of various systematic uncertainties. Two different neutrino fluxes have been considered, namely a CP-violation optimized flux and a ντ optimized flux. Our results show that the addition of the νμ→ ντ appearance channel does not reduce the current uncertainties on the standard 3-ν oscillation parameters while it can improve in a significant way the sensitivity to the Non-Standard Interaction parameter |∈μτ| and to the new mixing angle θ34 of a sterile neutrino model of the 3 + 1 type.