Evidence for muon neutrino oscillation in an accelerator-based experiment.

  title={Evidence for muon neutrino oscillation in an accelerator-based experiment.},
  author={Ester Aliu and Sofia Andringa and Shin-ichi Aoki and J. Argyriades and Kouichi Asakura and R. Ashie and Heather Berns and Hyoungchan Bhang and Alain Blondel and Silvana Borghi and Jacques Bouchez and Jordi Burguet-Castell and Dave R. Casper and C. Cavata and Amelia Cervera and Kang Ok Cho and Jae Hoon Choi and Ubaldo Dore and X. Espinal and Maximilien Fechner and Elodie Fernandez and Yasushi Fukuda and J-J. Gomez-Cadenas and Richard Gran and Tetsu Hara and Munetake Hasegawa and Takuro Hasegawa and Kei Hayashi and Yoshinari Hayato and Richard Helmer and James E. Hill and Keisuke Hiraide and Junko Hosaka and Atsuko K. Ichikawa and Masataka Iinuma and Atsushi Ikeda and Takao Inagaki and Taku Ishida and Kenji Ishihara and Taku Ishii and Masaki Ishitsuka and Yoshitaka Itow and Taiki Iwashita and Hyun Il Jang and E. J. Jeon and In Sub Jeong and K. K. Joo and G. Jover and Chulwoo Jung and Takaaki Kajita and Jun Kameda and K. Kaneyuki and Issei Kato and Edward Kearns and D. Kerr and Chang Oh Kim and Marat Khabibullin and A. N. Khotjantsev and D. Kielczewska and Jinsul Kim and S. B. Kim and P. Kitching and Katsuyoshi Kobayashi and Takashi Kobayashi and Akira Konaka and Y. Koshio and Wiebke Kropp and Jumpei Kubota and Yu G Kudenko and Yoshitaka Kuno and T. Kutter and John G. Learned and S. A. Likhoded and I. T. Lim and P. F. Loverre and Lucio Ludovici and Hatae Maesaka and Jean-Laurent Mallet and Celestina Mariani and Toshiki Maruyama and Shigenobu Matsuno and V G Matveev and Cyril Mauger and K McConnel and C Mcgrew and S. P. Mikheyev and Akihiro Minamino and Sol{\`e}ne Mine and Oleg. Y. Mineev and Chihiro Mitsuda and Michisaburo Miura and Yuichi Moriguchi and Takeshi Morita and S. Moriyama and Takeshi Nakadaira and Masayuki Nakahata and Kensuke Nakamura and Itsuo Nakano and Tuyoshi Nakaya and Shoei Nakayama and Toshio Namba and Ryutaro Nambu and Salasa Nawang and K. I. Nishikawa and Koh-hei Nitta and Francisca Avil{\'e}s Nova and Pilar Novella and Yasutaka Obayashi and Akira Okada and Kimihiro Okumura and S. M. Oser and Yuichi Oyama and M. Y. Pac and F. Pierre and Alberto Guadarrama Rodriguez and Choji Saji and Makoto Sakuda and Federico S{\'a}nchez and A. Sarrat and Tomoharu Sasaki and Kate Scholberg and Robert E. Schroeter and Motoo Sekiguchi and Emma Sharkey and Masato Shiozawa and K. K. Shiraishi and G. Vidal – Sitjes and Michael B. Smy and Henry W. Sobel and Jennifer L Stone and L. R. Sulak and Atsushi Suzuki and Yoshitaka Suzuki and Takashi Takahashi and Yumiko Takenaga and Yukihiro Takeuchi and Kousuke Taki and Yosuke Takubo and Nobukatsu Tamura and Masahiko Tanaka and R. Terri and S T'jampens and Ana M Tornero-L{\'o}pez and Yuya Totsuka and Shigenori Ueda and Mark R Vagins and Christopher W. Walter and Wenqiang Wang and R. Jeffrey Wilkes and Shoichi Yamada and Shoji Yamamoto and Chiaki Takano Yanagisawa and N. V. Yershov and Hiroshi Yokoyama and Misako Yokoyama and Juhwan Yoo and Masaho Yoshida and J. Zalipska},
  journal={Physical review letters},
  volume={94 8},
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). 

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