Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2×10^{21} Protons on Target.

K Abe,R Akutsu,A Ali,J Amey,C Andreopoulos,L Anthony,M Antonova,S Aoki,A Ariga,Y Ashida,Y Azuma,S Ban,M Barbi,G J Barker,G Barr,C Barry,M Batkiewicz,F Bench,V Berardi,S Berkman,R M Berner,L Berns,S Bhadra,S Bienstock,A Blondel,S Bolognesi,B Bourguille, S B Boyd,D Brailsford,A Bravar,C Bronner,M Buizza Avanzini,J Calcutt,T Campbell,S Cao,S L Cartwright,M G Catanesi,A Cervera,A Chappell,C Checchia,D Cherdack,N Chikuma,G Christodoulou,J Coleman,G Collazuol,D Coplowe,A Cudd,A Dabrowska,G De Rosa,T Dealtry,P F Denner,S R Dennis,C Densham,F Di Lodovico,N Dokania,S Dolan,O Drapier,K E Duffy,J Dumarchez,P Dunne,S Emery-Schrenk,A Ereditato,P Fernandez,T Feusels,A J Finch,G A Fiorentini,G Fiorillo,C Francois,M Friend,Y Fujii,R Fujita,D Fukuda,Y Fukuda,K Gameil,C Giganti,F Gizzarelli,T Golan,M Gonin,D R Hadley,L Haegel,J T Haigh,P Hamacher-Baumann,D Hansen,J Harada,M Hartz,T Hasegawa,N C Hastings,T Hayashino,Y Hayato,A Hiramoto,M Hogan,J Holeczek,F Hosomi,A K Ichikawa,M Ikeda,J Imber,T Inoue,R A Intonti,T Ishida, T Ishii,M Ishitsuka,K Iwamoto,A Izmaylov,B Jamieson,M Jiang,S Johnson,P Jonsson,C K Jung,M Kabirnezhad,A C Kaboth,T Kajita,H Kakuno,J Kameda,D Karlen,T Katori,Y Kato,E Kearns,M Khabibullin,A Khotjantsev,H Kim,J Kim,S King,J Kisiel,A Knight,A Knox,T Kobayashi,L Koch,T Koga,P P Koller,A Konaka,L L Kormos,Y Koshio,K Kowalik,H Kubo,Y Kudenko,R Kurjata,T Kutter,M Kuze,L Labarga,J Lagoda,M Lamoureux,P Lasorak,M Laveder,M Lawe,M Licciardi,T Lindner,Z J Liptak,R P Litchfield,X Li,A Longhin,J P Lopez,T Lou,L Ludovici,X Lu,L Magaletti,K Mahn,M Malek,S Manly,L Maret,A D Marino,J F Martin,P Martins,T Maruyama,T Matsubara,V Matveev,K Mavrokoridis,W Y Ma,E Mazzucato,M McCarthy,N McCauley,K S McFarland,C McGrew,A Mefodiev,C Metelko,M Mezzetto,A Minamino,O Mineev,S Mine,A Missert,M Miura,S Moriyama,J Morrison,Th A Mueller,S Murphy,Y Nagai,T Nakadaira,M Nakahata,Y Nakajima,K G Nakamura,K Nakamura,K D Nakamura,Y Nakanishi,S Nakayama,T Nakaya,K Nakayoshi,C Nantais,C Nielsen,K Niewczas,K Nishikawa,Y Nishimura, T S Nonnenmacher,P Novella,J Nowak,H M O'Keeffe,L O'Sullivan,K Okumura,T Okusawa,W Oryszczak,S M Oser,R A Owen,Y Oyama,V Palladino,J L Palomino,V Paolone,P Paudyal,M Pavin,D Payne,L Pickering, C Pidcott,E S Pinzon Guerra,C Pistillo,B Popov,K Porwit,M Posiadala-Zezula,A Pritchard,B Quilain,T Radermacher,E Radicioni,P N Ratoff,E Reinherz-Aronis,C Riccio,E Rondio,B Rossi,S Roth,A Rubbia,A C Ruggeri,A Rychter,K Sakashita,F Sánchez,S Sasaki,E Scantamburlo,K Scholberg,J Schwehr,M Scott,Y Seiya,T Sekiguchi,H Sekiya,D Sgalaberna,R Shah,A Shaikhiev,F Shaker,D Shaw,M Shiozawa,A Smirnov,M Smy,J T Sobczyk,H Sobel,Y Sonoda,J Steinmann,T Stewart,P Stowell,Y Suda,S Suvorov,A Suzuki,S Y Suzuki,Y Suzuki,A A Sztuc,R Tacik,M Tada,A Takeda,Y Takeuchi,R Tamura,H K Tanaka,H A Tanaka,T Thakore,L F Thompson,W Toki,C Touramanis,K M Tsui,T Tsukamoto,M Tzanov,Y Uchida,W Uno,M Vagins,Z Vallari,G Vasseur,C Vilela,T Vladisavljevic,V V Volkov,T Wachala,J Walker,Y Wang,D Wark,M O Wascko,A Weber,R Wendell,M J Wilking,C Wilkinson,J R Wilson,R J Wilson,C Wret,Y Yamada,K Yamamoto, S Yamasu,C Yanagisawa,G Yang,T Yano,K Yasutome,S Yen,N Yershov,M Yokoyama,T Yoshida,M Yu,A Zalewska,J Zalipska,K Zaremba,G Zarnecki,M Ziembicki,E D Zimmerman,M Zito,S Zsoldos,A Zykova

PHYSICAL REVIEW LETTERS（2018）

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摘要

The T2K experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and antineutrino beams. With an exposure of 14.7(7.6) x 10(20) protons on target in the neutrino (antineutrino) mode, 89 nu(e) candidates and seven anti-nu(e) candidates are observed, while 67.5 and 9.0 are expected for delta(CP) = 0 and normal mass ordering. The obtained 2 sigma confidence interval for the CP-violating phase, delta(CP), does not include the CP-conserving cases (delta(CP) = 0, pi). The best-fit values of other parameters are sin(2) theta(23) = 0.526(-0.036)(+0.032) and Delta m(32)(2) = 2.463(-0.070)(+0.071) x 10(-3) eV(2)/c(4).

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