arxiv: 1407.3513 · v2 · pith:O62JAU56new · submitted 2014-07-13 · ✦ hep-ex

Observation of nu_tau appearance in the CNGS beam with the OPERA experiment

OPERA Collaboration: N. Agafonova , A. Aleksandrov , A. Anokhina , S. Aoki , A. Ariga , T. Ariga , T. Asada , D. Bender

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A. Bertolin C. Bozza R. Brugnera A. Buonaura S. Buontempo B. Buttne M. Chernyavsky A. Chukanov L. Consiglio N. D'Ambrosio G. De Lellis M. De Serio P. Del Amo Sanchez A. Di Crescenzo D. Di Ferdinando N. Di Marco S. Dmitrievski M. Dracos D. Duchesneau S. Dusini T. Dzhatdoev J. Ebert A. Ereditato R. A. Fini T. Fukuda G. Galati A. Garfagnini G. Giacomelli C. Goellnitz J. Goldberg Y. Gornushkin G. Grella M. Guler C. Gustavino C. Hagner T. Hara T. Hayakawa A. Hollnagel B. Hosseini H. Ishida K. Ishiguro K. Jakovcic C. Jollet C. Kamiscioglu M. Kamiscioglu T. Katsuragawa J. Kawada H. Kawahara J. H. Kim S. H. Kim N. Kitagawa B. Klicek K. Kodama M. Komatsu U. Kose I. Kreslo A. Lauria J. Lenkeit A. Ljubicic A. Longhin P. Loverre M. Malenica A. Malgin G. Mandrioli T. Matsuo V. Matveev N. Mauri E. Medinaceli A. Meregaglia M. Meyer S. Mikado M. Miyanishi P. Monacelli M. C. Montesi K. Morishima M. T. Muciaccia N. Naganawa T. Naka M. Nakamura T. Nakano Y. Nakatsuka K. Niwa S. Ogawa N. Okateva A. Olshevsky T. Omura K. Ozaki A. Paoloni B. D. Park I. G. Park L. Pasqualini A. Pastore L. Patrizii H. Pessard C. Pistillo D. Podgrudkov N. Polukhina M. Pozzato F. Pupilli M. Roda T. Roganova H. Rokujo G. Rosa O. Ryazhskaya O. Sato A. Schembri I. Shakiryanova T. Shchedrina A. Sheshukov H. Shibuya T. Shiraishi G. Shoziyoev S. Simone M. Sioli C. Sirignano G. Sirri M. Spinetti L. Stanco N. Starkov S. M. Stellacci M. Stipcevic P. Strolin S. Takahashi M. Tenti F. Terranova V. Tioukov S. Tufanli A. Umemoto P. Vilain M. Vladimirov L. Votano J. L. Vuilleumier G. Wilquet B. Wonsak C. S. Yoon I. Yaguchi M. Yoshimoto S. Zemskova A. Zghiche

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keywords appearanceeventscandidatedataexperimentoperaoscillationsadding

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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 analysed events and the low background, nu_mu -> nu_tau oscillations are established with a significance of 4.2sigma.

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Observation of nu_tau appearance in the CNGS beam with the OPERA experiment

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