Abstract
The OPERA neutrino experiment was designed to perform a unique v τ appearance measurement in the v μ CNGS beam to confirm the oscillation mechanism in the atmospheric sector v μ → v τ . The detection of v τ leptons produced in v τ CC interactions and of their decays is accomplished exploiting the high spatial resolution of nuclear emulsions. Five v τ candidate events have been detected in the full data sample from 2008-2012 CNGS runs, with an expected background of 0.25 events. The background only hypothesis is rejected with a significance larger than 5 σ. The analysis of the tau neutrino sample in the framework of the 3+1 neutrino model is also presented. Furthermore OPERA good capabilities in detecting electron neutrino interactions allow setting limits on the v μ → v e oscillation channel.
Highlights
The OPERA neutrino experiment was designed to perform a unique ντ appearance measurement in the νμ CNGS beam to confirm the oscillation mechanism in the atmospheric sector νμ → ντ
The analysis of nuclear emulsion films is performed in the OPERA scanning laboratories in Europe and Japan by fast automatic scanning systems developed to reconstruct with sub-micrometric accuracy the neutrino interaction events
The electronic detector data are used to identify the brick in which the neutrino interaction occurred
Summary
The OPERA neutrino experiment was designed to perform a unique ντ appearance measurement in the νμ CNGS beam to confirm the oscillation mechanism in the atmospheric sector νμ → ντ. The electronic detectors were used to trigger the neutrino interactions, to locate the brick in which the interaction took place, to identify muons and measure their momentum and charge. The analysis of nuclear emulsion films is performed in the OPERA scanning laboratories in Europe and Japan by fast automatic scanning systems developed to reconstruct with sub-micrometric accuracy the neutrino interaction events.
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