Results from the OPERA experiment

Abstract

The OPERA long baseline experiment located in the INFN Gran Sasso underground Laboratory was designed to establish the ${\nu }_{\mu }$ $\to$ ${\nu }_{\tau }$ oscillations in appearance mode, using the CNGS neutrino beam. Five ${\nu }_{\tau }$ candidate events have been detected in a data sample from the 2008-2012 runs, with a expected background of 0.25 events. The background only hypothesis is rejected with a significance larger than 5$\sigma$. The analysis of the tau neutrino sample in the framework of the 3+1 neutrino model is presented. OPERA is able to identify ${\nu }_e$ CC events due to the good tracking capabilities of its target. The electron neutrino sample is also used to set limits on the 3+1 oscillation parameters.