/ hep-ex arXiv:1507.01417


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


Agafonova, N. (Moscow, INR) ; Aleksandrov, A. (INFN, Naples) ; Anokhina, A. (Moscow State U.) ; Aoki, S. (Kobe U.) ; Ariga, A. (Bern U.) ; Ariga, T. (Bern U.) ; Bender, D. (Middle East Tech. U., Ankara) ; Bertolin, A. (INFN, Padua) ; Bodnarchuk, I. (Dubna, JINR) ; Bozza, C. (INFN, Salerno) ; Brugnera, R. (Padua U.) ; Buonaura, A. (Naples U.) ; Buontempo, S. (INFN, Naples) ; Buttner, B. (Hamburg U., Inst. Theor. Phys. II) ; Chernyavsky, M. (Lebedev Inst.) ; Chukanov, A. (Dubna, JINR) ; Consiglio, L. (INFN, Naples) ; D'Ambrosio, N. (Gran Sasso) ; De Lellis, G. (Naples U.) ; De Serio, M. (INFN, Bari) ; del Amo Sanchez, P. (Annecy, LAPP) ; Di Crescenzo, A. (INFN, Naples) ; Di Ferdinando, D. (INFN, Bologna) ; Di Marco, N. (Gran Sasso) ; Dmitrievski, S. (Dubna, JINR) ; Dracos, M. (Louis Pasteur U., Strasbourg I) ; Duchesneau, D. (Annecy, LAPP) ; Dusini, S. (INFN, Padua) ; Dzhatdoev, T. (Moscow State U.) ; Ebert, J. (Hamburg U., Inst. Theor. Phys. II) ; Ereditato, A. (Bern U.) ; Fini, R.A. (INFN, Bari) ; Fornari, F. (Bologna U.) ; Fukuda, T. (Toho U.) ; Galati, G. (Naples U.) ; Garfagnini, A. (Padua U.) ; Goldberg, J. (Technion) ; Gornushkin, Y. (Dubna, JINR) ; Grella, G. (INFN, Salerno) ; Guler, A.M. (Middle East Tech. U., Ankara) ; Gustavino, C. (INFN, Rome) ; Hagner, C. (Hamburg U., Inst. Theor. Phys. II) ; Hara, T. (Kobe U.) ; Hayakawa, H. (Nagoya U.) ; Hollnagel, A. (Hamburg U., Inst. Theor. Phys. II) ; Hosseini, B. (Naples U.) ; Ishiguro, K. (Nagoya U.) ; Jakovcic, K. (Boskovic Inst., Zagreb) ; Jollet, C. (Louis Pasteur U., Strasbourg I) ; Kamiscioglu, C. (Middle East Tech. U., Ankara) ; Kamiscioglu, M. (Middle East Tech. U., Ankara) ; Kim, J.H. (Gyeongsang Natl. U.) ; Kim, S.H. (Gyeongsang Natl. U.) ; Kitagawa, N. (Nagoya U.) ; Klicek, B. (Boskovic Inst., Zagreb) ; Kodama, K. (Aichi U.) ; Komatsu, M. (Nagoya U.) ; Kose, U. (INFN, Padua) ; Kreslo, I. (Bern U.) ; Laudisio, F. (INFN, Salerno) ; Lauria, A. (Naples U.) ; Ljubicic, A. (Boskovic Inst., Zagreb) ; Longhin, A. (INFN, Rome) ; Loverre, P.F. (Rome U.) ; Malgin, A. (Moscow, INR) ; Malenica, M. (Boskovic Inst., Zagreb) ; Mandrioli, G. (INFN, Bologna) ; Matsuo, T. (Toho U.) ; Matsushita, T. (Nagoya U.) ; Matveev, V. (Moscow, INR) ; Mauri, N. (Bologna U.) ; Medinaceli, E. (Padua U.) ; Meregaglia, A. (Louis Pasteur U., Strasbourg I) ; Mikado, S. (Nihon U., Narashino) ; Miyanishi, M. (Nagoya U.) ; Mizutani, F. (Kobe U.) ; Monacelli, P. (INFN, Rome) ; Montesi, M.C. (Naples U.) ; Morishima, K. (Nagoya U.) ; Muciaccia, M.T. (INFN, Bari) ; Naganawa, N. (Nagoya U.) ; Naka, T. (Nagoya U.) ; Nakamura, M. (Nagoya U.) ; Nakano, T. (Nagoya U.) ; Nakatsuka, Y. (Nagoya U.) ; Niwa, K. (Nagoya U.) ; Ogawa, S. (Toho U.) ; Olchevsky, A. (Dubna, JINR) ; Omura, T. (Nagoya U.) ; Ozaki, K. (Kobe U.) ; Paoloni, A. (INFN, Rome) ; Paparella, L. (INFN, Bari) ; Park, B.D. (Gyeongsang Natl. U.) ; Park, I.G. (Gyeongsang Natl. U.) ; Pasqualini, L. (Bologna U.) ; Pastore, A. (Bari U.) ; Patrizii, L. (INFN, Bologna) ; Pessard, H. (Annecy, LAPP) ; Pistillo, C. (Bern U.) ; Podgrudkov, D. (Moscow State U.) ; Polukhina, N. (Lebedev Inst.) ; Pozzato, M. (Bologna U.) ; Pupilli, F. (INFN, Rome) ; Roda, M. (Padua U.) ; Roganova, T. (Moscow State U.) ; Rokujo, H. (Nagoya U.) ; Rosa, G. (Rome U.) ; Ryazhskaya, O. (Moscow, INR) ; Sato, O. (Nagoya U.) ; Schembri, A. (Gran Sasso) ; Schmidt-Parzefall, W. (Hamburg U., Inst. Theor. Phys. II) ; Shakirianova, I. (Moscow, INR) ; Shchedrina, T. (Naples U.) ; Sheshukov, A. (Dubna, JINR) ; Shibuya, H. (Toho U.) ; Shiraishi, T. (Nagoya U.) ; Shoziyoev, G. (Moscow State U.) ; Simone, S. (INFN, Bari) ; Sioli, M. (Bologna U.) ; Sirignano, C. (Padua U.) ; Sirri, G. (INFN, Bologna) ; Sotnikov, A. (Dubna, JINR) ; Spinetti, M. (INFN, Rome) ; Stanco, L. (INFN, Padua) ; Starkov, N. (Lebedev Inst.) ; Stellacci, S.M. (INFN, Salerno) ; Stipcevic, M. (Boskovic Inst., Zagreb) ; Strolin, P. (Naples U.) ; Takahashi, S. (Kobe U.) ; Tenti, M. (INFN, Bologna) ; Terranova, F. (Milan U.) ; Tioukov, V. (INFN, Naples) ; Tufanli, S. (Bern U.) ; Vilain, P. (Brussels U.) ; Vladymyrov, M. (Lebedev Inst.) ; Votano, L. (INFN, Rome) ; Vuilleumier, J.L. (Bern U.) ; Wilquet, G. (Brussels U.) ; Wonsak, B. (Hamburg U., Inst. Theor. Phys. II) ; Yoon, C.S. (Gyeongsang Natl. U.) ; Zemskova, S. (Dubna, JINR)

Pages: 7

Abstract: The OPERA experiment was designed to search for $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations in appearance mode, i.e. by detecting the $\tau$-leptons produced in charged current $\nu_{\tau}$ interactions. The experiment took data from 2008 to 2012 in the CERN Neutrinos to Gran Sasso beam. The observation of $\nu_{\mu} \rightarrow \nu_{\tau}$ appearance, achieved with four candidate events in a sub-sample of the data, was previously reported. In this paper, a fifth $\nu_{\tau}$ 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 $\nu_{\mu}\rightarrow \nu_{\tau}$ oscillations in appearance mode with a significance larger than 5 $\sigma$.

Web-Page: http://inspirehep.net/record/1381524/files/ev5_kin_histos_23.png; http://inspirehep.net/record/1381524/files/arXiv:1507.01417.pdf; http://www.interactions.org/cms/?pid=1034825; http://www.symmetrymagazine.org/article/june-2015/opera-catches-fifth-tau-neutrino?email_issue=796


Note: 7 pages, 3 figures

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