The OPERA experiment is designed to search for oscillations in appearance mode i.e. through the direct observation of the lepton in charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two candidates with a tau decaying into hadrons were observed in a sub-sample of data of the 2008-2011 runs. Here we report the observation of a third candidate in the decay channel coming from the analysis of a sub-sample of the 2012 run. Taking into account the estimated background, the absence of oscillations is excluded at the 3.4 sigma level.
Evidence for nu-mu → nu-tau appearance in the CNGS neutrino beam with the OPERA experiment
GRELLA, Giuseppe;
In corso di stampa
Abstract
The OPERA experiment is designed to search for oscillations in appearance mode i.e. through the direct observation of the lepton in charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two candidates with a tau decaying into hadrons were observed in a sub-sample of data of the 2008-2011 runs. Here we report the observation of a third candidate in the decay channel coming from the analysis of a sub-sample of the 2012 run. Taking into account the estimated background, the absence of oscillations is excluded at the 3.4 sigma level.File in questo prodotto:
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