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Observation of tau neutrino appearance in the CNGS beam with the OPERA experiment

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Title: Observation of tau neutrino appearance in the CNGS beam with the OPERA experiment

Author(s): Agafonova, N; Aleksandrov, A; Anokhina, A; Aoki, S; Ariga, A; Ariga, T; Asada, T; Bender, D; Bertolin, A; Bozza, C; Brugnera, R; Buonaura, A; Buontempo, S; Buttner, B; Chernyavsky, M; Chukanov, A; Consiglio, L; D'Ambrosio, N; De Lellis, G; De Serio, M; Sanchez, PD; Di Crescenzo, A; Di Ferdinando, D; Di Marco, N; Dmitrievski, S; Dracos, M; Duchesneau, D; Dusini, S; Dzhatdoev, T; Ebert, J; Ereditato, A; Fini, RA; Fukuda, T; Galati, G; Garfagnini, A; Giacomelli, G; Goellnitz, C; Goldberg, J; Gornushkin, Y; Grella, G; Guler, M; Gustavino, C; Hagner, C; Hara, T; Hayakawa, T; Hollnagel, A; Hosseini, B; Ishida, H; Ishiguro, K; Jakovcic, K; Jollet, C; Kamiscioglu, C; Kamiscioglu, M; Katsuragawa, T; Kawada, J; Kawahara, H; Kim, JH; Sung Hyun Kim; Kitagawa, N; Klicek, B; Kodama, K; Komatsu, M; Kose, U; Kreslo, I; Lauria, A; Lenkeit, J; Ljubicic, A; Longhin, A; Loverre, P; Malenica, M; Malgin, A; Mandrioli, G; Matsuo, T; Matveev, V; Mauri, N; Medinaceli, E; Meregaglia, A; Meyer, M; Mikado, S; Miyanishi, M; Monacelli, P; Montesi, MC; Morishima, K; Muciaccia, MT; Naganawa, N; Naka, T; Nakamura, M; Nakano, T; Nakatsuka, Y; Niwa, K; Ogawa, S; Okateva, N; Olshevsky, A; Omura, T; Ozaki, K; Paoloni, A; Park, BD; Park, IG; Pasqualini, L; Pastore, A; Patrizii, L; Pessard, H; Pistillo, C; Podgrudkov, D; Polukhina, N; Pozzato, M; Pupilli, F; Roda, M; Roganova, T; Rokujo, H; Rosa, G; Ryazhskaya, O; Sato, O; Schembri, A; Shakiryanova, I; Shchedrina, T; Sheshukov, A; Shibuya, H; Shiraishi, T; Shoziyoev, G; Simone, S; Sioli, M; Sirignano, C; Sirri, G; Spinetti, M; Stanco, L; Starkov, N; Stellacci, SM; Stipcevic, M; Strolin, P; Takahashi, S; Tenti, M; Terranova, F; Tioukov, V; Tufanli, S; Umemoto, A; Vilain, P; Vladimirov, M; Votano, L; Vuilleumier, JL; Wilquet, G; Wonsak, B; Yoon, CS; Yaguchi, I; Yoshimoto, M; Zemskova, S; Zghiche, A

Publication Date: 2014-10

Journal: PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, no.10

Publisher: OXFORD UNIV PRESS INC

Abstract: The OPERA experiment is searching for nu(mu) -> nu(tau) oscillations in appearance mode, i.e., via the direct detection of tau leptons in nu(tau) charged-current interactions. The evidence of nu(mu) -> nu(tau) appearance has been previously reported with three nu(tau) candidate events using a sub-sample of data from the 2008-2012 runs. We report here a fourth nu(tau) candidate event, with the tau decaying into a hadron, found after adding the 2012 run events without any muon in the final state to the data sample. Given the number of analyzed events and the low background, nu(mu) -> nu(tau) oscillations are established with a significance of 4.2 sigma. © The Author(s) 2014. Published by Oxford University Press on behalf of the Physical Society of Japan. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.