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

N Agafonova,A Aleksandrov,A Anokhina,Shunsuke Aoki,A Ariga, Tomoko Ariga, T Asada, D Bender,A Bertolin,C Bozza,R Brugnera, A Buonaura,S Buontempo, B Buttne,M M Chernyavsky,A Chukanov,L Consiglio, N Dambrosio,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,Toshio Fukuda,G Galati,A Garfagnini, G Giacomelli, C Goellnitz,J Goldberg,Y Gornushkin,G Grella,M Guler,C Gustavino, C Hagner,Toshiro Hara,T Hayakawa, A Hollnagel, B Hosseini,Hideaki Ishida,Kazumori Ishiguro, K Jakovcic, C Jollet,C Kamiscioglu, M Kamiscioglu, T Katsuragawa, J Kawada, Hitoshi Kawahara,J H Kim,Soo Hyun 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 S Malgin, G Mandrioli, Takayuki Matsuo,Viktor 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,Teiji Naka,M Nakamura,T Nakano,Yasuhiro Nakatsuka,Koichi Niwa,S Ogawa,N Okateva, A G Olshevsky,T Omura,Kazumi Ozaki,A Paoloni,B D Park,I G Park, L Pasqualini

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS（2014）

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摘要

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 analyzed events and the low background, nu(mu) -> nu(tau) oscillations are established with a significance of 4.2 sigma.

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