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

Date

2014-10-01

Author

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.
Buettner, B.
Chernyavsky, M.
Chukanov, A.
Consiglio, L.
D'Ambrosio, N.
De Lellis, G.
De Serio, M.
Sanchez, P. Del Amo
Di Crescenzo, A.
Di Ferdinando, D.
Di Marco, N.
Dmitrievski, S.
Dracos, M.
Duchesneau, D.
Dusini, S.
Dzhatdoev, T.
Ebert, J.
Ereditato, A.
Fini, R. A.
Fukuda, T.
Galati, G.
Garfagnini, A.
Giacomelli, G.
Goellnitz, C.
Goldberg, J.
Gornushkin, Y.
Grella, G.
Güler, Ali Murat
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, J. H.
Kim, S. H.
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, M. C.
Morishima, K.
Muciaccia, M. T.
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, B. D.
Park, I. G.
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, S. M.
Stipcevic, M.
Strolin, P.
Takahashi, S.
Tenti, M.
Terranova, F.
Tioukov, V.
Tufanli, S.
Umemoto, A.
Vilain, P.
Vladimirov, M.
Votano, L.
Vuilleumier, J. L.
Wilquet, G.
Wonsak, B.
Yoon, C. S.
Yaguchi, I.
Yoshimoto, M.
Zemskova, S.
Zghiche, A.

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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.

URI

https://hdl.handle.net/11511/51825

Collections

Department of Physics, Article