Evidence for Muon Neutrino Oscillation in an Accelerator-Based Experiment

E Aliu,T Morita,S Ueda,P Kitching,J Argyriades,M Hasegawa,R J Wilkes,C Mcgrew,C O Kim,J Kameda,Y Oyama,K O Cho,O Mineev,C K Jung,M Nakahata,C Mauger,A Blondel,T Ishii,M Tanaka,Y Takeuchi,Y Obayashi,J H Choi,S Nawang,E Kearns,T Maruyama,M Sakuda,I Kato,K Kaneyuki,K Asakura,C Cavata,Y Koshio,R Schroeter,M Yokoyama,Y Hayato,Y Fukuda,M Ishitsuka,H I Jang,J Zalipska,S Likhoded,T Kobayashi,S Nakayama,A Suzuki,C Mitsuda,T Nakaya,L Sulak,K Ishihara,R L Helmer,J Mallet,S Matsuno,C W Walter,K Scholberg,R Gran,K Okumura,K Mcconnel,M Khabibullin,S Yamada,S Mikheyev,M Shiozawa,U Dore,G Jover,S Borghi,J Hosaka,J Bouchez,R Nambu,M Fechner,T Kutter,H Maesaka,A Sarrat,H Berns,E Sharkey,T Sasaki,N Yershov,R Ashie,Y Takenaga,Y Moriguchi,E J Jeon,K Hiraide,V Matveev,Y Totsuka,H Bhang,D Casper,T Inagaki,R Terri,Y Kuno,K Nitta,K Nakamura,C Saji,T Nakadaira,M Y Pac,S Andringa,T Iwashita,A Minamino,J Yoo,T Hara,A Konaka,I T Lim,D Kerr,I Nakano,J Hill,T Kajita,Y Suzuki,A Cervera,S Moriyama,A Khotjantsev,C Yanagisawa,F Pierre,Y Takubo,P Novella,A K Ichikawa,J Y Kim,T Hasegawa,F Nova,M Sekiguchi,K Taki,W Wang,S Mine,S M Oser,N Tamura,S Kim,T Namba,L Ludovici,Y Itow,C Mariani,G Sitjes,K Nishikawa,Shuji Yamamoto ,Akira Ikeda ,A Tornero-López ,M B Smy ,D Kiełczewska ,Hiromi Yokoyama ,J Burguet–Castell ,E Fernández ,Jun Kubota ,P Loverre ,Masato Yoshida ,S T’jampens ,Makoto Miura ,Shigeki Aoki ,J G Learned ,In Seok Jeong ,Toru Ishida ,K K Joo ,X Espinal Curull ,W R Kropp ,Kenji Hayashi ,H W Sobel ,F Sánchez ,J L Stone ,Y Kudenko ,Atsushi Okada ,Tohru Takahashi ,M R Vagins ,J J Gómez-Cadenas ,Kiyoshi Shiraishi ,Munekazu Iinuma ,Kazuyoshi Kobayashi ,A Rodríguez

doi:10.1103/physrevlett.94.081802

Abstract

We present results for nu(mu) oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced nu(mu) beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy-dependent disappearance of nu(mu), which we presume have oscillated to nu(tau). The probability that we would observe these results if there is no neutrino oscillation is 0.0050% (4.0 sigma).

Full Text