/ hep-ex arXiv:1401.2079


Evidence for $\nu_\mu \to \nu_\tau$ 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.) ; Asada, T. (Nagoya U.) ; Autiero, D. (Lyon, IPN) ; Dhahbi, A.Ben (Bern U.) ; Badertscher, A. (Zurich, ETH) ; Bender, D. (Middle East Tech. U., Ankara) ; Bertolin, A. (INFN, Padua) ; Bozza, C. (INFN, Salerno) ; Brugnera, R. (INFN, Padua) ; Brunet, F. (Annecy, LAPP) ; Brunetti, G. (Bern U.) ; Buonaura, A. (Naples U.) ; Buontempo, S. (INFN, Naples) ; Buttner, B. (Hamburg U., Inst. Theor. Phys. II) ; Chaussard, L. (Lyon, IPN) ; Chernyavsky, M. (Lebedev Inst.) ; Chiarella, V. (INFN, Rome) ; Chukanov, A. (Dubna, JINR) ; Consiglio, L. (INFN, Naples) ; D'Ambrosio, N. (Gran Sasso) ; De Lellis, G. (Naples U.) ; De Serio, M. (Bari U.) ; 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.) ; Favier, J. (Annecy, LAPP) ; Ferber, T. (Hamburg U., Inst. Theor. Phys. II) ; Ferone, G. (Naples U.) ; Fini, R.A. (INFN, Bari) ; Fukuda, T. (Toho U.) ; Galati, G. (Bari U.) ; Garfagnini, A. (INFN, Padua) ; Giacomelli, G. (INFN, Bologna) ; Goellnitz, C. (Hamburg U., Inst. Theor. Phys. II) ; Goldberg, J. (Technion) ; Gornushkin, Y. (Dubna, JINR) ; Grella, G. (INFN, Salerno) ; Grianti, F. (INFN, Rome) ; Guler, M. (Middle East Tech. U., Ankara) ; Gustavino, C. (INFN, Rome) ; Hagner, C. (Hamburg U., Inst. Theor. Phys. II) ; Hakamata, K. (Nagoya U.) ; Hara, T. (Kobe U.) ; Hayakawa, T. (Nagoya U.) ; Hierholzer, M. (Hamburg U., Inst. Theor. Phys. II) ; Hollnagel, A. (Hamburg U., Inst. Theor. Phys. II) ; Hosseini, B. (Naples U.) ; Ishida, H. (Toho U.) ; Ishiguro, K. (Nagoya U.) ; Ishikawa, M. (Nagoya U.) ; Jakovcic, K. (Boskovic Inst., Zagreb) ; Jollet, C. (Louis Pasteur U., Strasbourg I) ; Kamiscioglu, C. (Ankara U.) ; Kamiscioglu, M. (Middle East Tech. U., Ankara) ; Katsuragawa, T. (Nagoya U.) ; Kawada, J. (Bern U.) ; Kawahara, H. (Nagoya U.) ; Kim, J.H. (Gyeongsang Natl. U.) ; Kim, S.H. (Gyeongsang Natl. U.) ; Kimura, M. (Bern 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.) ; Lauria, A. (Naples U.) ; Lenkeit, J. (Hamburg U., Inst. Theor. Phys. II) ; Ljubicic, A. (Boskovic Inst., Zagreb) ; Longhin, A. (INFN, Rome) ; Loverre, P. (INFN, Rome) ; Malgin, A. (Moscow, INR) ; Mandrioli, G. (INFN, Bologna) ; Marteau, J. (Lyon, IPN) ; Matsuo, T. (Toho U.) ; Matveev, V. (Moscow, INR) ; Mauri, N. (INFN, Bologna) ; Medinaceli, E. (INFN, Padua) ; Meregaglia, A. (Louis Pasteur U., Strasbourg I) ; Migliozzi, P. (INFN, Naples) ; Mikado, S. (Toho U.) ; Miyanishi, M. (Nagoya U.) ; Miyashita, E. (Nagoya U.) ; Monacelli, P. (INFN, Aquila) ; Montesi, M.C. (Naples U.) ; Morishima, K. (Nagoya U.) ; Muciaccia, M.T. (Bari U.) ; 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.) ; Okateva, N. (Lebedev Inst.) ; Olshevsky, A. (Dubna, JINR) ; Omura, T. (Nagoya U.) ; Ozaki, K. (Kobe U.) ; Paoloni, A. (INFN, Rome) ; Park, B.D. (Gyeongsang Natl. U.) ; Park, I.G. (Gyeongsang Natl. U.) ; Pastore, A. (INFN, Bari) ; Patrizii, L. (INFN, Bologna) ; Pennacchio, E. (Lyon, IPN) ; Pessard, H. (Annecy, LAPP) ; Pistillo, C. (Bern U.) ; Podgrudkov, D. (Moscow State U.) ; Polukhina, N. (Lebedev Inst.) ; Pozzato, M. (INFN, Bologna) ; Pretzl, K. (Bern U.) ; Pupilli, F. (Gran Sasso) ; Rescigno, R. (INFN, Salerno) ; Roda, M. (INFN, Padua) ; Rokujo, H. (Nagoya U.) ; Roganova, T. (Moscow State U.) ; Rosa, G. (INFN, Rome) ; Rostovtseva, I. (Moscow, ITEP) ; Rubbia, A. (Zurich, ETH) ; Ryazhskaya, O. (Moscow, INR) ; Sato, O. (Nagoya U.) ; Sato, Y. (Utsunomiya U.) ; Schembri, A. (Gran Sasso) ; Schmidt-Parzefal, W. (Hamburg U., Inst. Theor. Phys. II) ; Shakiryanova, I. (Moscow, INR) ; Shchedrina, T. (INFN, Naples) ; Sheshukov, A. (INFN, Naples) ; Shibuya, H. (Toho U.) ; Shiraishi, T. (Nagoya U.) ; Shoziyoev, G. (Moscow State U.) ; Simone, S. (Bari U.) ; Sioli, M. (INFN, Bologna) ; Sirignano, C. (INFN, Padua) ; Sirri, G. (INFN, Bologna) ; Spinetti, M. (INFN, Rome) ; Stanco, L. (INFN, Padua) ; Starkov, N. (Lebedev Inst.) ; Stellacci, S.M. (INFN, Salerno) ; Stipcevic, M. (Boskovic Inst., Zagreb) ; Strauss, T. (Bern U.) ; Strolin, P. (Naples U.) ; Suzuki, K. (Nagoya 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.) ; Vladimirov, 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.) ; Yoshida, J. (Nagoya U.) ; Yoshimoto, M. (Nagoya U.) ; Zaitsev, Y. (Moscow, ITEP) ; Zemskova, S. (Dubna, JINR) ; Zghiche, A. (Annecy, LAPP)

Pages: 9

Abstract: The OPERA experiment is designed to search for $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations in appearance mode i.e. through the direct observation of the $\tau$ lepton in $\nu_{\tau}$ charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two $\nu_{\tau}$ candidates with a $\tau$ decaying into hadrons were observed in a sub-sample of data of the 2008-2011 runs. Here we report the observation of a third $\nu_\tau$ candidate in the $\tau^-\to\mu^-$ decay channel coming from the analysis of a sub-sample of the 2012 run. Taking into account the estimated background, the absence of $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations is excluded at the 3.4 $\sigma$ level.

Web-Page: http://inspirehep.net/record/1276512/files/Figure1.png; http://inspirehep.net/record/1276512/files/Figure2.png; http://inspirehep.net/record/1276512/files/Figure3.png; http://inspirehep.net/record/1276512/files/Figure4.png; http://inspirehep.net/record/1276512/files/Figure5.png; http://inspirehep.net/record/1276512/files/arXiv:1401.2079.pdf


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