Orateur
Description
The OPERA experiment at the Gran Sasso Laboratory was designed to study nu_mu → nu_tau oscillations in appearance mode in the CERN-to-Gran Sasso neutrino beam. We report the final analysis of the full data sample based on looser selection criteria than in previous analyses and multivariate approach. Oscillation parameters have been determined with a reduced statistical uncertainty, and the discovery of tau neutrino appearance is confirmed with an improved significance level. The measurement of nu_tau CC cross-section was performed, and the direct observation of the nu_tau- lepton number is also reported. Moreover, the search for electron neutrino events has been extended to the full dataset exploiting an improved method for the
electron neutrino energy estimation. New limits have been set in the 3+1 neutrino model.
