First muon-neutrino disappearance study with an off-axis beam

Katsumi Abe, K Kasami, E Mazzucato, M Y Pac, C Densham,R A Owen, K Gilje,H Kakuno,A Zalewska,J M Levy,J Holeczek, J Hignight,Jun Kubota, Takao Maruyama,Shuhji Aoki, T C Nicholls,Mitsuo Ikeda,M O Wascko,Masamichi Iwasaki,M Laveder,B L Hartfiel,H W Sobel,L F Thompson, D I Scully,Satoshi Nakayama,T Nakaya,J Caravaca Rodriguez, H Kawamuko, L Magaletti,T M Raufer,S Mine,P A Rodrigues, M Shiozawa,U Dore,Michael George, I T Lim,T Tsukamoto,Benedito Mauro Rossi,C Licciardi,M Dziewiecki,Mitsuhiro Yokoyama,G Wikstrom,A J Finch,Akio Yamamoto,C Giganti,G Kogan, K Iyogi,S Koike,A Vacheret,P De Perio,J M Poutissou,Mark J Scott,Y Takenaga,E D Zimmerman, Yuko Shimizu,A Dabrowska,M Gonin,A Bravar,Kosaku Nitta,W R Kropp,N Tanimoto,C Yanagisawa,A K Ichikawa,J Y Kim,K P Lee,David Q Wark,M J Wilking, C J Lister,J Escallier, S W Bentham,H Aihara, E Hirose, M Dziomba,Masaru Shibata,Y Hayato,M Sorel,G Jovermanas, A Terashima,P T Le,M Goldhaber,T Kikawa,R Tacik,F Retiere,Taro Ishii, G Barr,Y Oyama, M Siyad,A Khotjantsev, T Duboyski,S Manly,A Rubbia, J Muratore,S Horikawa,M Zito, K Laihem,Viktor Matveev,Christian B Nielsen,K Matsuoka,K B M Mahn,J Lagoda,Takayuki Tomaru, O Araoka, A Badertscher,T Nakadaira,T Hara, R P Litchfield,J Dumarchez,V Berardi, F Khanam,F Pierre,A Ariga,E D Frank,T Mclachlan,Kai Huang, Kazuhiko Hayashi,S Cartwright,K Koseki,J J Walding, A Delbart,O Mineev,K Sakashita, Z Williamson,T Hiraki, G Vasseur, J Argyriades,Y Takeuchi, Y Yamanoi, Francisca Javiela Munoz Sanchez,Hitoshi Yamaoka,J Zalipska,D J Payne,S Roth, S Assylbekov,E Rondio,T Wongjirad,E Kearns, P Mijakowski,T Okusawa, T Maryon,D Beznosko,S Giffin,P Kitching, T Kajita,R L Helmer,Kazuhiro Tanaka,B Smith,Joseph M Zmuda,A Ereditato, G Lopez,P Guzowski, A L Muir, Rodolfo Del Castillo,L Zambelli,Y Kurimoto,V Paolone, Takashi Ozaki,M Ieva,Kazuaki Nakajima,M L Navin,Yasuhisa Fujii,S Boyd,S Takahashi,J Imber,M Ziembicki,S Emery, T Szeglowski,Chisato Matsumura, J R Stone, K Connolly, J Beucher, S Gomi, Kae Nakamura,M Szeptycka,S Bhadra,B Kirby,P Dinh Tran,G Collazuol,J J Gomezcadenas, D Autiero,Omar Veledar, A Haesler,A Korzenev,M Ward,K Yamamoto,S M Oser,R Sulej,C A Chavez, M Besnier,C A Miller, M Batkiewicz,A Longhin,S Yen,D Karlen,S Suzuki, C Metelko,Michel Raymond,A Izmaylov, T Lindner,J L Raaf, Mitsuo Taguchi, G Ganetis,N Grant,A Cazes,Robert Henderson,N P Kulkarni, K Ieki,N C Hastings, Tohru Ishida,M Otani,G Christodoulou, Alexander P Grant, O Drapier,S B Kim,Kazunori Suzuki, S A Dytman, P Wanderer,Hiroo Sekiya, J Kameda,M Tanaka,F Bay, Michael William Day,M G Catanesi,A Weber, K K Joo, M Mezzetto,H Nishino,K L Kowalik,M Khabibullin, Y Totsuka, Masahiro Iida, F Moreau,T Ariga, M R Vagins,V Palladino,N Yershov,W Qian, C Ishihara, P Masliah,F Di Lodovico,B E Berger,P Gumplinger, T Haruyama,T Wachala,Toshimasa Yamauchi,W Metcalf,Jan T Sobczyk, J Schwehr, Takamichi Nakamoto,A D Marino,P N Ratoff,C Bojechko,K Mavrokoridis, H Ohhata, V Galymov,S Di Luise, M Ravonel, G Mituka,F D M Blaszczyk,C Bronner,A Ferrero, Shane W Davis,N Mccauley,D Kielczewska, S J Ives, J D Perkin,A Robert,A Gaudin,J Kisiel,K Zaremba,V I Kravtsov, J Bouchez, M Macaire, Isao Kato, M Anerella,Y Koshio,T Ogitsu,L Ludovici, P Loverre,K Hamano,Hidekazu Tanaka,M Litos,R Terri,A Carver,B Still, C Mcgrew, F Gannaway, S Choi,Takahiro Okamura,J Steinmann,Tingting Yuan,Y Kudenko, I Taylor,A V Waldron,Marcello Messina,N J Buchanan,R J Smith,Tomohiro Yano, Kunihiro Tashiro,E L Mathie,A Thorley,J P Coleman,G De Rosa, B Popov,R J Wilson,A Suzuki, V Pettinacci,J Marzec, K Kaneyuki, J Albert,K Nishikawa, G F Pearce, K Mizouchi,T Golan, P Przewlocki, A Hillairet, A Marone,C Andreopoulos,Gareth J Barker,R Kurjata,Takayo Hasegawa, A Sarrat,A Murakami,M Barbi,W Coleman,H Kubo,A Marchionni,A Hatzikoutelis,H S Budd,N Higashi,I Kreslo,F Dufour,J Myslik,R A Johnson,J Dobson, J Marteau, D Calvet, S Tobayama, B Andrieu,B P Morgan, A Gendotti, A K Ghosh,Neal B West, P Stamoulis, M Fechner,David Hadley,R Poutissou, A Missert, D Ruterbories,Yoshiaki Kouzuma, T Nobuhara,K S Mcfarland,Yuko Fukuda, Arihiro Takeda,A Konaka,A Cervera,T Kutter,R J Wilkes,Ko Okumura,M Bass,Magdalena Malek,S Yamada,M B Smy,Nobuo Nagai,R Wendell,K Ueno,D Hansen,P Sinclair, J F Martin,M D Haigh, Y Ajima,Kenichi Sasaki,M Nakahata,T Kobayashi, A Hyndman,M Lawe,D Terhorst,N Kimura,A Stahl,K Scholberg,L Whitehead,J Ilic, M Miura,T Lux,M Tzanov,R Sacco,S Sabouri,Sheila E Murphy,Mitsuhiro Tada,L S Esposito,J P A M De Andre,N Abgrall, P F Harrison, G P Ward,W H Toki,T Dealtry,A Curioni,E Radicioni, L Monfregola, Yuzo Uchida, Christopher J Hansen,Y Obayashi,D G Brookroberge, J A Nowak,Takeshi Sekiguchi, I Danko,M Hartz,Laureano F Escudero, C Strabel, C Touramanis,C K Jung, Yoshiji Yamada,Y Seiya,P Paul, E Poplawska,Bruce Jamieson,B S Nielsen,R G Calland,L L Kormos, M Posiadala,I Bertram,Yu Suzuki,S Moriyama,C W Walter,G Davies,C Hearty, A Blondel, J M Roney,A Minamino,Takeshi Nakai, Y Makida,Jun Wang,J R Wilson, D Naples,H Kaji,Rabindra Nath Das,Scott S Short, M Murdoch

PHYSICAL REVIEW D（2012）

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摘要

We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km muon-neutrino beam from Tokai to Kamioka is the first implementation of the off-axis technique in a long-baseline neutrino oscillation experiment. With data corresponding to 1.43 x 10(20) protons on target, we observe 31 fully-contained single mu-like ring events in Super-Kamiokande, compared with an expectation of 104 +/- 14 (syst) events without neutrino oscillations. The best-fit point for two-flavor nu(mu) -> nu(tau) oscillations is sin(2)(2 theta(23)) = 0.98 and vertical bar Delta m(32)(2)vertical bar = 2.65 x 10(-3) eV(2). The boundary of the 90% confidence region includes the points sin(2)(2 theta(23)), vertical bar Delta m(32)(2)vertical bar = (1.0, 3.1 x 10(-3) eV(2)), (0.84, 2.65 x 10(-3) eV(2)) and (1.0, 2.2 x 10(-3) eV(2)).

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neutrino oscillation

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