Speaker
Mustafa KAMISCIOGLU
(Middle East Technical University)
Description
The OPERA experiment reached its main goal by proving the appearance of ντ in the CNGS νμ 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 σ. The search has been extended to ντ-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 with a high probability of being a ντ interaction with charm production is reported. Based on the enlarged data sample the estimation of Δm223 in appearance mode is presented. The search for νe 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 νμ→νe 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 νμ→ντ 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 presented.
