PoS - Proceedings of Science
Volume 307 - XVII International Workshop on Neutrino Telescopes (NEUTEL2017) - Session xi - convener: daniele gibin – sterile neutrinos (2)
More results from the OPERA experiment
M. Tenti*  on behalf of the OPERA Collaboration
Full text: pdf
Pre-published on: March 28, 2018
Published on: April 05, 2018
The OPERA experiment reached its main goal by proving the appearance of tau-neutrinos in the CNGS muon-neutrino 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 with a significance of 5.1 $\sigma$. The search was 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 showing a double vertex topology with a high probability of being a tau-neutrino interaction with charm production will be reported. Based on the enlarged data sample the estimation of $\Delta \textrm{m}^{2}_{23}$ in appearance mode will be presented and updated. The search for electron-neutrino interactions was 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 the $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations in the framework of the sterile neutrino model was also performed. Finally, the analysis of the annual modulation of atmospheric muons will be discussed.
DOI: https://doi.org/10.22323/1.307.0046
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