Final results of the OPERA experiment on ${\nu }_{\tau }$ appearance in the CNGS beam

Abstract

The OPERA experiment was designed to study ${\nu }_{\mu }\to {\nu }_{\tau }$ oscillations in appearance mode in the CNGS neutrino beam. In this letter we report the final analysis of the full data sample collected between 2008 and 2012, corresponding to $17.97\cdot 10^{19}$ protons on target. Selection criteria looser than in previous analyses have produced ten ${\nu }_{\tau }$ candidate events, thus reducing the statistical uncertainty in the measurement of the oscillation parameters and of ${\nu }_{\tau }$ properties. A multivariate approach for event identification has been applied to the candidate events and the discovery of ${\nu }_{\tau }$ appearance is confirmed with an improved significance level of 6.1 $\sigma$. $\Delta m_{23}^2$ has been measured, in appearance mode, with an accuracy of 20%. The measurement of ${\nu }_{\tau }$ CC cross-section, for the first time with a negligible contamination from ${\bar{\nu }}_{\tau }$, and the first direct observation of the ${\nu }_{\tau }$ lepton number are also reported.

arXiv comment7 pages, 3 figures

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