Speaker
Gabriele Sirri
(Universita e INFN, Bologna (IT))
Description
The OPERA experiment at the Gran Sasso underground laboratory has been
designed to study the nu_mu -> nu_tau oscillation in appearance mode in the
CNGS neutrino beam. Four nu_tau candidate events have been confirmed so
far, using a sub-sample of data from the 2008-2012 runs. Given the number
of analysed events and the low background, nu_mu -> nu_tau oscillations have
been established with a significance of 4.2 sigma. In the talk we will present
results based on an increased sample of scanned emulsion target units (bricks).
The nu_tau data analysis will be updated and discussed, with emphasis on the
background constraints obtained by using dedicated data-driven control samples.
The analysis of the collected electron neutrino sample and the analysis of the
muon charge ratio in the cosmic ray sample will also be covered.
