OPERA Results

Abstract

The aim of OPERA is to prove the existence of the ${\nu }_{\mu }\to {\nu }_{\tau }$ neutrino oscillation by detecting the τ lepton emitted in the ${\nu }_{\tau }$ CC interactions. Thanks to the sub-micron resolution of the emulsion technique, the τ decay topology is clearly identified. The accumulated number of neutrino events in the OPERA target until mid-September 2012 is about 16000. Among the sample of 4190 events analysed so-far, two candidate ${\nu }_{\tau }$ CC interactions have been identified. The first one was published in May 2010 and the second one was recently reported at the NEUTRINO 2012 conference in June 2012.