Evidence for νμ → ντ appearance in the CNGS neutrino beam with the OPERA experiment

Ariga, Akitaka; Ariga, Tomoko; Ben Dhahbi, Anis; Brunetti, Giulia; Ereditato, Antonio; Kawada, Jiro; Kimura, Mitsuhiro; Kreslo, Igor; Pistillo, Ciro; Strauss, Thomas; Tufanli, Serhan; Vuilleumier, Jean-Luc (2014). Evidence for νμ → ντ appearance in the CNGS neutrino beam with the OPERA experiment. Physical review. D - particles, fields, gravitation, and cosmology, D89(5), 051102. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.89.051102

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The OPERA experiment is designed to search for ν μ →ν τ oscillations in appearance mode, i.e., through the direct observation of the τ lepton in ν τ -charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two ν τ candidates with a τ decaying into hadrons were observed in a subsample of data of the 2008–2011 runs. Here we report the observation of a third ν τ candidate in the τ − →μ − decay channel coming from the analysis of a subsample of the 2012 run. Taking into account the estimated background, the absence of ν μ →ν τ oscillations is excluded at the 3.4 σ level.

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