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. 2018 May 25;120(21):211801.
doi: 10.1103/PhysRevLett.120.211801.

Final Results of the OPERA Experiment on ν_{τ} Appearance in the CNGS Neutrino Beam

N Agafonova  1 , A Alexandrov  2 , A Anokhina  3 , S Aoki  4 , A Ariga  5 , T Ariga  5   6 , A Bertolin  7 , C Bozza  8 , R Brugnera  7   9 , A Buonaura  2   10 , S Buontempo  2 , M Chernyavskiy  11 , A Chukanov  12 , L Consiglio  2 , N D'Ambrosio  13 , G De Lellis  2   10 , M De Serio  14   15 , P Del Amo Sanchez  16 , A Di Crescenzo  2   10 , D Di Ferdinando  17 , N Di Marco  13 , S Dmitrievsky  12 , M Dracos  18 , D Duchesneau  16 , S Dusini  7 , T Dzhatdoev  3 , J Ebert  19 , A Ereditato  5 , J Favier  16 , R A Fini  15 , F Fornari  17   20 , T Fukuda  21 , G Galati  2   10 , A Garfagnini  7   9 , V Gentile  22 , J Goldberg  23 , S Gorbunov  11 , Y Gornushkin  12 , G Grella  8 , A M Guler  24 , C Gustavino  25 , C Hagner  19 , T Hara  4 , T Hayakawa  21 , A Hollnagel  19 , K Ishiguro  21 , A Iuliano  2   10 , K Jakovcic  26 , C Jollet  18 , C Kamiscioglu  24   27 , M Kamiscioglu  24 , S H Kim  28 , N Kitagawa  21 , B Klicek  29 , K Kodama  30 , M Komatsu  21 , U Kose  7 , I Kreslo  5 , F Laudisio  7   9 , A Lauria  2   10 , A Ljubicic  26 , A Longhin  7   9 , P Loverre  25 , M Malenica  26 , A Malgin  1 , G Mandrioli  17 , T Matsuo  31 , V Matveev  1 , N Mauri  17   20 , E Medinaceli  7   9 , A Meregaglia  18 , S Mikado  32 , M Miyanishi  21 , F Mizutani  4 , P Monacelli  25 , M C Montesi  2   10 , K Morishima  21 , M T Muciaccia  14   15 , N Naganawa  21 , T Naka  21 , M Nakamura  21 , T Nakano  21 , K Niwa  21 , S Ogawa  31 , N Okateva  11 , A Olchevsky  12 , K Ozaki  4 , A Paoloni  33 , L Paparella  14   15 , B D Park  28 , L Pasqualini  17   20 , A Pastore  15 , L Patrizii  17 , H Pessard  16 , C Pistillo  5 , D Podgrudkov  3 , N Polukhina  11   34 , M Pozzato  17   20 , F Pupilli  7 , M Roda  7   9 , T Roganova  3 , H Rokujo  21 , G Rosa  25 , O Ryazhskaya  1 , A Sadovsky  12 , O Sato  21 , A Schembri  13 , I Shakiryanova  1 , T Shchedrina  11 , E Shibayama  4 , H Shibuya  31 , T Shiraishi  21 , S Simone  14   15 , C Sirignano  7   9 , G Sirri  17 , A Sotnikov  12 , M Spinetti  33 , L Stanco  7 , N Starkov  11 , S M Stellacci  8 , M Stipcevic  29 , P Strolin  2   10 , S Takahashi  4 , M Tenti  17 , F Terranova  35 , V Tioukov  2 , S Tufanli  5 , A Ustyuzhanin  2   36 , S Vasina  12 , P Vilain  37 , E Voevodina  2 , L Votano  33 , J L Vuilleumier  5 , G Wilquet  37 , B Wonsak  19 , C S Yoon  28 ; OPERA Collaboration
Affiliations

Final Results of the OPERA Experiment on ν_{τ} Appearance in the CNGS Neutrino Beam

N Agafonova et al. Phys Rev Lett. .

Erratum in

Abstract

The OPERA experiment was designed to study ν_{μ}→ν_{τ} oscillations in the appearance mode in the CERN to Gran Sasso Neutrino beam (CNGS). In this Letter, we report the final analysis of the full data sample collected between 2008 and 2012, corresponding to 17.97×10^{19} protons on target. Selection criteria looser than in previous analyses have produced ten ν_{τ} candidate events, thus reducing the statistical uncertainty in the measurement of the oscillation parameters and of ν_{τ} properties. A multivariate approach for event identification has been applied to the candidate events and the discovery of ν_{τ} appearance is confirmed with an improved significance level of 6.1σ. |Δm_{32}^{2}| has been measured, in appearance mode, with an accuracy of 20%. The measurement of the ν_{τ} charged-current cross section, for the first time with a negligible contamination from ν[over ¯]_{τ}, and the first direct evidence for the ν_{τ} lepton number are also reported.

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