Speaker
Description
The OPERA experiment reached its main goal by proving the appearance of $\nu_\tau$ in the CNGS $\nu_\mu$ beam. A total sample of 5 candidates fulfilling the analysis defined in the proposal was detected with a S/B ratio of about ten allowing to reject the null hypothesis at 5.1 $\sigma$. The search has been extended to $\nu_\tau$-like interactions failing the kinematical analysis defined in the experiment proposal to obtain a statistically enhanced, lower purity, signal sample. One such interesting neutrino interaction with a double vertex topology is reported with a high probability of being a $\nu_\tau$ interaction with charm production. Based on the enlarged data sample the estimation of $\Delta$m$^2_{23}$ in appearance mode is presented. The search for $\nu_e$ interactions has been extended over the full data set with a more than twofold increase in statistics with respect to published data. The analysis of the $\nu_\mu\rightarrow\nu_e$ channel is updated and the implications of the electron neutrino sample in the framework of the 3+1 sterile model is discussed. An analysis of $\nu_\mu\rightarrow\nu_\tau$ interactions in the framework of the sterile neutrino model has also been performed. Finally, the results of the analysis of the annual modulation of the cosmic muon rate is discussed.
| Experimental Collaboration | OPERA Collaboration |
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