Discovery of tau neutrino appearance in the CNGS neutrino beam with the OPERA experiment
Creators: name: OPERA Collaboration
name: Agafonova, N.
name: Aleksandrov, A.
name: Anokhina, A.
name: Aoki, S.
name: Ariga, A.
name: Ariga, T.
name: Bender, D.
name: Bertolin, A.
name: Bodnarchuk, I.
name: Bozza, C.
name: Brugnera, R.
name: Buonaura, A.
name: Buontempo, S.
name: Büttner, B.
name: Chernyavsky, M.
name: Chukanov, A.
name: Consiglio, L.
name: D'Ambrosio, N.
name: De Lellis, G.
name: De Serio, M.
name: Sanchez, P. Del Amo
name: Di Crescenzo, A.
name: Di Ferdinando, D.
name: Di Marco, N.
name: Dmitrievski, S.
name: Dracos, M.
name: Duchesneau, D.
name: Dusini, S.
name: Dzhatdoev, T.
name: Ebert, J.
name: Ereditato, A.
name: Fini, R. A.
name: Fornari, F.
name: Fukuda, T.
name: Galati, G.
name: Garfagnini, A.
name: Goldberg, J.
name: Gornushkin, Y.
name: Grella, G.
name: Guler, A. M.
name: Gustavino, C.
name: Hagner, C.
name: Hara, T.
name: Hayakawa, H.
name: Hollnagel, A.
name: Hosseini, B.
name: Ishiguro, K.
name: Jakovcic, K.
name: Jollet, C.
name: Kamiscioglu, C.
name: Kamiscioglu, M.
name: Kim, J. H.
name: Kim, S. H.
name: Kitagawa, N.
name: Klicek, B.
name: Kodama, K.
name: Komatsu, M.
name: Kose, U.
name: Kreslo, I.
name: Laudisio, F.
name: Lauria, A.
name: Ljubicic, A.
name: Longhin, A.
name: Loverre, P. F.
name: Malgin, A.
name: Malenica, M.
name: Mandrioli, G.
name: Matsuo, T.
name: Matsushita, T.
name: Matveev, V.
name: Mauri, N.
name: Medinaceli, E.
name: Meregaglia, A.
name: Mikado, S.
name: Miyanishi, M.
name: Mizutani, F.
name: Monacelli, P.
name: Montesi, M. C.
name: Morishima, K.
name: Muciaccia, M. T.
name: Naganawa, N.
name: Naka, T.
name: Nakamura, M.
name: Nakano, T.
name: Nakatsuka, Y.
name: Niwa, K.
name: Ogawa, S.
name: Olchevsky, A.
name: Omura, T.
name: Ozaki, K.
name: Paoloni, A.
name: Paparella, L.
name: Park, B. D.
name: Park, I. G.
name: Pasqualini, L.
name: Pastore, A.
name: Patrizii, L.
name: Pessard, H.
name: Pistillo, C.
name: Podgrudkov, D.
name: Polukhina, N.
name: Pozzato, M.
name: Pupilli, F.
name: Roda, M.
name: Roganova, T.
name: Rokujo, H.
name: Rosa, G.
name: Ryazhskaya, O.
name: Sato, O.
name: Schembri, A.
name: Schmidt-Parzefall, W.
name: Shakirianova, I.
name: Shchedrina, T.
name: Sheshukov, A.
name: Shibuya, H.
name: Shiraishi, T.
name: Shoziyoev, G.
name: Simone, S.
name: Sioli, M.
name: Sirignano, C.
name: Sirri, G.
name: Sotnikov, A.
name: Spinetti, M.
name: Stanco, L.
name: Starkov, N.
name: Stellacci, S. M.
name: Stipcevic, M.
name: Strolin, P.
name: Takahashi, S.
name: Tenti, M.
name: Terranova, F.
name: Tioukov, V.
name: Tufanli, S.
name: Vilain, P.
name: Vladymyrov, M.
name: Votano, L.
name: Vuilleumier, J. L.
name: Wilquet, G.
name: Wonsak, B.
name: Yoon, C. S.
name: Zemskova, S.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The OPERA experiment was designed to search for $ν_μ \rightarrow ν_τ$ 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 $ν_μ \rightarrow ν_τ$ appearance, achieved with four candidate events in a sub-sample of the data, was previously reported. In this paper, 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 assessing the discovery of $ν_μ\rightarrow ν_τ$ oscillations in appearance mode with a significance larger than 5 $σ$.
description: 7 pages, 3 figures