title: Discovery of τ Neutrino Appearance in the CNGS Neutrino Beam with the OPERA Experiment.
abstract: The OPERA experiment was designed to search for ν_{μ}→ν_{τ} oscillations in appearance mode, i.e., by detecting the τ leptons produced in charged current ν_{τ} interactions. The experiment took data from 2008 to 2012 in the CERN Neutrinos to Gran Sasso beam. The observation of the ν_{μ}→ν_{τ} appearance, achieved with four candidate events in a subsample of the data, was previously reported. In this Letter, a fifth ν_{τ} candidate event, found in an enlarged data sample, is described. Together with a further reduction of the expected background, the candidate events detected so far allow us to assess the discovery of ν_{μ}→ν_{τ} oscillations in appearance mode with a significance larger than 5σ.
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authors.affiliation: INFN Sezione di Padova, I-35131 Padova, Italy.|Dipartimento di Fisica e Astronomia dell'Università di Padova, I-35131 Padova, Italy.
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authors.affiliation: INFN Sezione di Napoli, 80125 Napoli, Italy.|Dipartimento di Fisica dell'Università Federico II di Napoli, I-80125 Napoli, Italy.
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authors.affiliation: INFN Sezione di Napoli, 80125 Napoli, Italy.|Dipartimento di Fisica dell'Università Federico II di Napoli, I-80125 Napoli, Italy.
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authors.affiliation: INFN Sezione di Bologna, I-40127 Bologna, Italy.
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authors.affiliation: INFN-Laboratori Nazionali di Frascati dell'INFN, I-00044 Frascati (Roma), Italy.|Dipartimento di Fisica dell'Università di Milano-Bicocca, I-20126 Milano, Italy.
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authors.affiliation: INFN Sezione di Napoli, 80125 Napoli, Italy.
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authors.lastname: Votano
authors.affiliation: Albert Einstein Center for Fundamental Physics, Laboratory for High Energy Physics (LHEP), University of Bern, CH-3012 Bern, Switzerland.
authors.forename: J L
authors.initials: JL
authors.lastname: Vuilleumier
authors.affiliation: IIHE, Université Libre de Bruxelles, B-1050 Brussels, Belgium.
authors.forename: G
authors.initials: G
authors.lastname: Wilquet
authors.affiliation: Hamburg University, D-22761 Hamburg, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Wonsak
authors.affiliation: Gyeongsang National University, 900 Gazwa-dong, Jinju 660-701, Korea.
authors.forename: C S
authors.initials: CS
authors.lastname: Yoon
authors.affiliation: JINR-Joint Institute for Nuclear Research, RUS-141980 Dubna, Russia.
authors.forename: S
authors.initials: S
authors.lastname: Zemskova