Evidence for ${\nu }_{\mu }\to {\nu }_{\tau }$ appearance in the CNGS neutrino beam with the OPERA experiment

Abstract

The OPERA experiment is designed to search for ${\nu }_{\mu }\to {\nu }_{\tau }$ oscillations in appearance mode i.e. through the direct observation of the $\tau$ lepton in ${\nu }_{\tau }$ charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two ${\nu }_{\tau }$ candidates with a $\tau$ decaying into hadrons were observed in a sub-sample of data of the 2008-2011 runs. Here we report the observation of a third ${\nu }_{\tau }$ candidate in the ${\tau }^{-}\to {\mu }^{-}$ decay channel coming from the analysis of a sub-sample of the 2012 run. Taking into account the estimated background, the absence of ${\nu }_{\mu }\to {\nu }_{\tau }$ oscillations is excluded at the 3.4 $\sigma$ level.

9 pages, 5 figures, 1 tables

References in corpus (1)

• Observation of a first ${\nu }_{\tau }$ candidate in the OPERA experiment in the CNGS beam

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