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Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam
Authors
K. Abe,N. Abgrall
Y. Ajima,H. Aihara,J. Albert,C. Andreopoulos,Bernard Andrieu,S. Aoki,O. Araoka,J. Argyriades,A. Ariga,T. Ariga,S. Assylbekov,S. Simone,A. Badertscher,M. Barbi,Gareth Barker,G. Barr,M. Bass,F. Bay,B. Nielsen,V. Berardi,B. Berger,M. Diesburg,M. Besnier,J. Beucher,Dmitriy Beznosko,S. Bhadra,F. Blaszczyk,A. Blondel,C. Bojechko,J. Bouchez,S. Boyd,A. Bravar,D. Brook-Roberge,N. Buchanan,H. Budd,D. Calvet,S. Cartwright,A. Carver,R. Fernández,M. Catanesi,S. Diglio,A. Cervera,C. Chavez,S. Choi,G. Christodoulou,J. Coleman,William Coleman,G. Collazuol,K. Connolly,A. Curioni,A. Da̧browska,V. Elvira,R. Das,G. Davies,S. Davis,M. Day,G. Rosa,J. Martin,A. Delbart,C. Densham,F. Lodovico,S. Luise,P. Tran,J. Dobson,U. Dore,O. Drapier,Frédéric Dufour,S. Dytman,A. Bursche,E. Thrane,P. Dunne,S. Errede,L. Escudero,M. Słodkowski,M. Fechner,A. Ferrero,F. Foster,E.D. Frank,Y. Fujii,Y. Fukuda,V. Galymov,A. Gaudin,A. Gendotti,M. George,S. Giffin,C. Giganti,K. Gilje,T. Golan,M. Goldhaber,J.J. Gómez-Cadenas,J. Nowak,N. Grant,A. Grant,P. Gumplinger,P. Guzowski,A. Haesler,Martin Haigh,R. Kowalewski,C. Hansen,T. Hara,P. Harrison,M. Weaver,M. Hartz,T. Haruyama,T. Hasegawa,S. Hastings,A. Hatzikoutelis,Kenji Hayashi,Y. Hayato,C. Hearty,K. McFarland,R. Henderson,Nao Higashi,J. Hignight,E. Hirose,J. Holeczek,Shin Horikawa,A. Hyndman,A. Ichikawa,K. Ieki,M. Ieva,M. Iida,M. Ikeda,J. Imber,Toru Ishida,C. Ishihara,T. Ishii,S. Ives,M. Iwasaki,K. Iyogi,A. Izmaylov,B. Jamieson,R. Johnson,K. Joo,G. Jover-Mañas,C. Jung,H. Kaji,T. Kajita,H. Kakuno,J. Kameda,K. Kaneyuki,D. Karlen,K. Kasami,I. Kato,E. Kearns,M. Khabibullin,F. Khanam,D. Kiełczewska,T. Kikawa,J. Kim,S. Kim,N. Kimura,B. Kirby,J. Kisiel,P. Kitching,T. Kobayashi,G. Kogan,S. Koike,A. Konaka,F. Retière,A. Korzenev,K. Koseki,Y. Kouzuma,N. Horikawa,V. Kravtsov,I. Kreslo,A. Rubbia,H. Kubo,Y. Kudenko,N. Kulkarni,R. Kurjata,J. Łagoda,K. Laihem,K. Lee,P. Le,T. Lesiak,C. Licciardi,I. Lim,M. Lamoureux,J. Learned,M. Litos,G. Felici,G. Lopez,L. Ludovici,T. Lux,M. Macaire,L. Magaletti,A. Maio,M. Malek,S. Manly,F. Marzano,Marvin Marshak,J. Marteau,M. Martı́nez,T Maryon,J. Marzec,P. Masliah,E. Mathie,C. Matsumura,S. Marcello,A. Kurepin,K. Mavrokoridis,N. McCauley,C. McGrew,Thomas Mclachlan,G. Romano,W. Metcalf,C. Metelko,M. Mezzetto,B. Viren,C. Miller,A. Minamino,O. Mineev,S. Mine,A. Missert,G. Mituka,M. Miura,K. Mizouchi,L. Monfregola,Tatiana Novikova,B. Morgan,S. Moriyama,J. Mueller,S. Kowalski,M. Murdoch,H. Muramatsu,M. Nakahata,T. Nakadaira,T. Nakai,K. Nakajima,T. Nakamoto,K. Nakamura,S. Nakayama,T. Nakaya,D. Naples,Marieke Navin,B. Nelson,R. Nichol,K. Nishikawa,H. Nishino,M. Noy,Y. Obayashi,T. Ogitsu,H. Ohhata,Tomotake Matsumura,K. Okumura,T. Okusawa,Masashi Otani,R. Owen,Y. Oyama,Tomoyuki Ozaki,M. Pac,S. Bachmann,S. Paul,D. Payne,G.F. Pearce,E. Skrzypczak,V. Pettinacci,F. Pierre,E. Poplawska,B. Popov,J.-M. Poutissou,R. Poutissou,C. Pistillo,W. Qian,V. Radeka,P. Ratoff,T. Raufer,M. Ravonel,M. Raymond,A. Robert,P. Rodrigues,E. Rondio,B. Rossi,D. Ruterbories,Shirin Sabouri,G. Rizzo,K. Sakashita,A. Sarrat,K. Sasaki,K. Scholberg,A. Rychter,M. Scott,D. Scully,Y. Seiya,T. Sekiguchi,H. Sekiya,D. Sgalaberna,Yuki Shimizu,M. Shiozawa,C. Touramanis,M. Siyad,R. Smith,Volodymyr Takhistov,H. Sobel,A. Stahl,P. Stamoulis,B. Still,C. Strabel,Lawrence Sulak,M. Šulc,P. Sutcliffe,A. Suzuki,K. Suzuki,Y. Takeuchi,S. Suzuki,Y. Suzuki,T. Szegłowski,M. Szeptycka,R. Tacik,Y. Suda,Sentaro Takahashi,S. Suvorov,К. Таnака,H. Tanaka,M. Tanaka,N. Tanimoto,Koichiro Tashiro,Ian Taylor,A. Terashima,D. Terhorst,J. Lees,A. Thorley,K. Ryan,T. Tsukamoto,K. Ueno,M. Vagins,G. Vasseur,J. Walding,A. Waldron,P. Wanderer,J. Wang,M.A. Ward,G Ward,M. Wascko,A. Weber,N. West,R. Wilkes,M. Wilking,R. Wilson,T. Wongjirad,S. Yamada,Y. Yamada,A. Yamamoto,Kei Yamamoto,Y. Yamanoi,H. Yamaoka,T. Yano,M. Zito,A. Zalewska,J. Zalipska,K. Zaremba,M. Ziembicki,J. Żmuda,Andrea Ferrero,A.J. Finch,Saverio Simone,I. Bertram,Stefano Casasso,A. Ereditato
+360 authors
,Hiroshi NunokawaJournal
Published
Jul 18, 2011
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Abstract
The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(13) = 0, the expected number of such events is 1.5±0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7×10(-3), equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2θ(13) < 0.28(0.34) for δ(CP) = 0 and a normal (inverted) hierarchy.
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