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Article
Report number arXiv:1804.04912
Title Final results of the OPERA experiment on $\nu_\tau$ appearance in the CNGS beam
Author(s)

Agafonova, N. (Moscow, INR) ; Alexandrov, A. (INFN, Naples) ; Anokhina, A. (SINP, Moscow) ; Aoki, S. (Kobe U.) ; Ariga, A. (U. Bern, AEC) ; Ariga, T. (U. Bern, AEC ; Kyushu U.) ; Bertolin, A. (INFN, Padua) ; Bozza, C. (INFN, Salerno ; Salerno U.) ; Brugnera, R. (INFN, Padua ; Padua U.) ; Buonaura, A. (INFN, Naples ; Naples U.) ; Buontempo, S. (INFN, Naples) ; Chernyavskiy, M. (Lebedev Inst.) ; Chukanov, A. (Dubna, JINR) ; Consiglio, L. (INFN, Naples) ; D'Ambrosio, N. (Gran Sasso) ; De Lellis, G. (INFN, Naples ; Naples U.) ; De Serio, M. (Bari U. ; INFN, Bari) ; del Amo Sanchez, P. (Annecy, LAPP) ; Di Crescenzo, A. (INFN, Naples ; Naples U.) ; Di Ferdinando, D. (INFN, Bologna) ; Di Marco, N. (Gran Sasso) ; Dmitrievsky, S. (Dubna, JINR) ; Dracos, M. (Strasbourg, IPHC) ; Duchesneau, D. (Annecy, LAPP) ; Dusini, S. (INFN, Padua) ; Dzhatdoev, T. (SINP, Moscow) ; Ebert, J. (Hamburg U.) ; Ereditato, A. (U. Bern, AEC) ; Favier, J. (Annecy, LAPP) ; Fini, R.A. (INFN, Bari) ; Fornari, F. (INFN, Bologna ; U. Bologna, DIFA) ; Fukuda, T. (Nagoya U.) ; Galati, G. (INFN, Naples ; Naples U.) ; Garfagnini, A. (INFN, Padua ; Padua U.) ; Gentile, V. (GSSI, Aquila) ; Goldberg, J. (Technion) ; Gornushkin, Y. (Dubna, JINR) ; Gorbunov, S. (Lebedev Inst.) ; Grella, G. (INFN, Salerno ; Salerno U.) ; Guler, A.M. (Middle East Tech. U., Ankara) ; Gustavino, C. (INFN, Rome) ; Hagner, C. (Hamburg U.) ; Hara, T. (Kobe U.) ; Hayakawa, T. (Nagoya U.) ; Hollnagel, A. (Hamburg U.) ; Ishiguro, K. (Nagoya U.) ; Iuliano, A. (Naples U.) ; Jakovcic, K. (Boskovic Inst., Zagreb) ; Jollet, C. (Strasbourg, IPHC) ; Kamiscioglu, C. (Middle East Tech. U., Ankara ; Ankara U.) ; Kamiscioglu, M. (Middle East Tech. U., Ankara) ; Kim, S.H. (Gyeongsang Natl. U.) ; Kitagawa, N. (Nagoya U.) ; Klicek, B. (Boskovic Inst., Zagreb) ; Kodama, K. (Aichi U. of Education) ; Komatsu, M. (Nagoya U.) ; Kose, U. (INFN, Padua) ; Kreslo, I. (U. Bern, AEC) ; Laudisio, F. (INFN, Padua ; Padua U.) ; Lauria, A. (INFN, Naples ; Naples U.) ; Ljubicic, A. (Boskovic Inst., Zagreb) ; Longhin, A. (Padua U. ; INFN, Padua) ; Loverre, P. (INFN, Rome) ; Malgin, A. (Moscow, INR) ; Malenica, M. (Boskovic Inst., Zagreb) ; Mandrioli, G. (INFN, Bologna) ; Matsuo, T. (Toho U.) ; Matveev, V. (Moscow, INR) ; Mauri, N. (INFN, Bologna ; U. Bologna, DIFA) ; Medinaceli, E. (INFN, Padua ; Padua U.) ; Meregaglia, A. (Strasbourg, IPHC) ; Mikado, S. (Nihon U., Narashino) ; Miyanishi, M. (Nagoya U.) ; Mizutani, F. (Kobe U.) ; Monacelli, P. (INFN, Rome) ; Montesi, M.C. (INFN, Naples ; Naples U.) ; Morishima, K. (Nagoya U.) ; Muciaccia, M.T. (Bari U. ; INFN, Bari) ; Naganawa, N. (Nagoya U.) ; Naka, T. (Nagoya U.) ; Nakamura, M. (Nagoya U.) ; Nakano, T. (Nagoya U.) ; Niwa, K. (Nagoya U.) ; Okateva, N. (Lebedev Inst.) ; Olchevsky, A. (Dubna, JINR) ; Ogawa, S. (Toho U.) ; Ozaki, K. (Kobe U.) ; Paoloni, A. (Frascati) ; Paparella, L. (Bari U. ; INFN, Bari) ; Park, B.D. (Gyeongsang Natl. U.) ; Pasqualini, L. (INFN, Bologna ; U. Bologna, DIFA) ; Pastore, A. (INFN, Bari) ; Patrizii, L. (INFN, Bologna) ; Pessard, H. (Annecy, LAPP) ; Pistillo, C. (U. Bern, AEC) ; Podgrudkov, D. (SINP, Moscow) ; Polukhina, N. (Lebedev Inst. ; Moscow Phys. Eng. Inst.) ; Pozzato, M. (INFN, Bologna ; U. Bologna, DIFA) ; Pupilli, F. (INFN, Padua) ; Roda, M. (INFN, Padua ; Padua U.) ; Roganova, T. (SINP, Moscow) ; Rokujo, H. (Nagoya U.) ; Rosa, G. (INFN, Rome) ; Ryazhskaya, O. (Moscow, INR) ; Sadovsky, A. (Dubna, JINR) ; Sato, O. (Nagoya U.) ; Schembri, A. (Gran Sasso) ; Shakiryanova, I. (Moscow, INR) ; Shchedrina, T. (Lebedev Inst.) ; Shibuya, H. (Toho U.) ; Shibayama, E. (Kobe U.) ; Shiraishi, T. (Nagoya U.) ; Simone, S. (Bari U. ; INFN, Bari) ; Sirignano, C. (INFN, Padua ; Padua U.) ; Sirri, G. (INFN, Bologna) ; Sotnikov, A. (Dubna, JINR) ; Spinetti, M. (Frascati) ; Stanco, L. (INFN, Padua) ; Starkov, N. (Lebedev Inst.) ; Stellacci, S.M. (INFN, Salerno ; Salerno U.) ; Stipcevic, M. (Boskovic Inst., Zagreb) ; Strolin, P. (INFN, Naples ; Naples U.) ; Takahashi, S. (Kobe U.) ; Tenti, M. (INFN, Bologna) ; Terranova, F. (Milan Bicocca U.) ; Tioukov, V. (INFN, Naples) ; Tufanli, S. (U. Bern, AEC) ; Ustyuzhanin, A. (Higher Sch. of Economics, Moscow ; INFN, Naples) ; Vasina, S. (Dubna, JINR) ; Vilain, P. (Brussels U., IIHE) ; Voevodina, E. (INFN, Naples) ; Votano, L. (Frascati) ; Vuilleumier, J.L. (U. Bern, AEC) ; Wilquet, G. (Brussels U., IIHE) ; Wonsak, B. (Hamburg U.) ; Yoon, C.S. (Gyeongsang Natl. U.)

Publication 2018-05-23
Imprint 2018-04-13
Number of pages 7
Note 7 pages, 3 figures
In: Phys. Rev. Lett. 120 (2018) pp.211801
DOI 10.1103/PhysRevLett.120.211801
10.1103/PhysRevLett.121.139901 (Erratum)
Subject category hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN SPS ; OPERA CNGS1
Abstract The OPERA experiment was designed to study $\nu_\mu\to\nu_\tau$ oscillations in appearance mode in the CNGS neutrino beam. In this letter we report the final analysis of the full data sample collected between 2008 and 2012, corresponding to $17.97\cdot 10^{19}$ protons on target. Selection criteria looser than in previous analyses have produced ten $\nu_\tau$ candidate events, thus reducing the statistical uncertainty in the measurement of the oscillation parameters and of $\nu_\tau$ properties. A multivariate approach for event identification has been applied to the candidate events and the discovery of $\nu_\tau$ appearance is confirmed with an improved significance level of 6.1 $\sigma$. $\Delta m^2_{23}$ has been measured, in appearance mode, with an accuracy of 20%. The measurement of $\nu_\tau$ CC cross-section, for the first time with a negligible contamination from $\bar{\nu}_\tau$, and the first direct observation of the $\nu_\tau$ lepton number are also reported.
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