Evidence for Muon Neutrino Oscillation in an Accelerator-Based Experiment
E. Aliu(Universitat Autònoma de Barcelona), S. Andringa(Universitat Autònoma de Barcelona), S. Aoki(Kobe University), J. Argyriades(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), K. Asakura(Kobe University), R. Ashie(The University of Tokyo), H. Berns(University of Washington), H. Bhang(Seoul National University), A. Blondel(University of Geneva), S. Borghi(University of Geneva), J. Bouchez(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), J. Burguet–Castell(Instituto de Física Corpuscular), D. Casper(University of California, Irvine), C. Cavata(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), A. Cervera(University of Geneva), K. O. Cho(Chonnam National University), J. H. Choi(Chonnam National University), U. Dore(Sapienza University of Rome), X. Espinal(Universitat Autònoma de Barcelona), M. Fechner(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), E. Fernández(Universitat Autònoma de Barcelona), Y. Fukuda(Miyagi University of Education), J.J. Gómez-Cadenas(Instituto de Física Corpuscular), R. Gran(University of Washington), T. Hara(Kobe University), M. Hasegawa(Kyoto University), T. Hasegawa(Tohoku University), Kazunori Hayashi(Kyoto University), Y. Hayato(High Energy Accelerator Research Organization), R. L. Helmer(TRIUMF), J. Hill(State University of New York), K. Hiraide(Kyoto University), J. Hosaka(The University of Tokyo), A. K. Ichikawa(High Energy Accelerator Research Organization), M. Iinuma(Hiroshima University), Akihiro Ikeda(Okayama University of Science), T. Inagaki(Kyoto University), Toru Ishida(High Energy Accelerator Research Organization), K. Ishihara(The University of Tokyo), T. Ishii(High Energy Accelerator Research Organization), M. Ishitsuka(Institute for Cosmic Ray Research), Y. Itow(The University of Tokyo), T. Iwashita(High Energy Accelerator Research Organization), H. I. Jang(Chonnam National University), E. J. Jeon(Seoul National University), In Seok Jeong(Chonnam National University), K. K. Joo(Seoul National University), G. Jover(Universitat Autònoma de Barcelona), C. K. Jung(State University of New York), T. Kajita(Institute for Cosmic Ray Research), J. Kameda(The University of Tokyo), K. Kaneyuki(Institute for Cosmic Ray Research), I. Kato(Kyoto University), E. Kearns(Boston University), D. Kerr(State University of New York), C. O. Kim(Korea University), M. Khabibullin(Institute for Nuclear Research), A. Khotjantsev(Institute for Nuclear Research), D. Kiełczewska(National Centre for Nuclear Research), J. Y. Kim(Chonnam National University), S. Kim(Seoul National University), P. Kitching(TRIUMF), Kazuyoshi Kobayashi(State University of New York), T. Kobayashi(High Energy Accelerator Research Organization), A. Konaka(TRIUMF), Y. Koshio(The University of Tokyo), W. Kropp(University of California, Irvine), Jun Kubota(Kyoto University), Y. Kudenko(Institute for Nuclear Research), Y. Kuno(The University of Osaka), T. Kutter(Louisiana State University), J. G. Learned(University of Hawaii System), S. Likhoded(Boston University), I. T. Lim(Chonnam National University), P. Loverre(Sapienza University of Rome), L. Ludovici(Sapienza University of Rome), H. Maesaka(Kyoto University), J. Mallet(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), C. Mariani(Sapienza University of Rome), T. Maruyama(High Energy Accelerator Research Organization), S. Matsuno(University of Hawaii System), V. Matveev(Institute for Nuclear Research), C. Mauger(National Centre for Nuclear Research), K. McConnel(Massachusetts Institute of Technology), C. McGrew(State University of New York), S. Mikheyev(Institute for Nuclear Research), A. Minamino(The University of Tokyo), S. Mine(University of California, Irvine), O. Mineev(Institute for Nuclear Research), C. Mitsuda(The University of Tokyo), M. Miura(The University of Tokyo), Y. Moriguchi(Kobe University), T. Morita(Kyoto University), S. Moriyama(The University of Tokyo), T. Nakadaira(Kyoto University), M. Nakahata(The University of Tokyo), K. Nakamura(High Energy Accelerator Research Organization), I. Nakano(Okayama University of Science), T. Nakaya(Kyoto University), S. Nakayama(Institute for Cosmic Ray Research), T. Namba(The University of Tokyo), R. Nambu(The University of Tokyo), S. Nawang(Hiroshima University), K. Nishikawa(Kyoto University), Koh‐hei Nitta(High Energy Accelerator Research Organization), F. Nova(Universitat Autònoma de Barcelona), P. Novella(Instituto de Física Corpuscular), Y. Obayashi(The University of Tokyo), Atsushi Okada(Institute for Cosmic Ray Research), K. Okumura(Institute for Cosmic Ray Research), S. M. Oser(University of British Columbia), Y. Oyama(High Energy Accelerator Research Organization), M. Y. Pac(Dongshin University), F. Pierre(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), A. Rodriguez(Universitat Autònoma de Barcelona), C. Saji(Institute for Cosmic Ray Research), M. Sakuda(Okayama University of Science), F. Sánchez(Universitat Autònoma de Barcelona), A. Sarrat(State University of New York), T. Sasaki(Kyoto University), K. Scholberg(Duke University), R. Schroeter(University of Geneva), M. Sekiguchi(Kobe University), E. Sharkey(State University of New York), M. Shiozawa(The University of Tokyo), Kiyoshi Shiraishi(University of Washington), G. Sitjes(Instituto de Física Corpuscular), M. Smy(University of California, Irvine), H. Sobel(University of California, Irvine), J. L. Stone(Boston University), L. Sulak(Boston University), Y. Suzuki(Kobe University), Y. Suzuki(The University of Tokyo), Tohru Takahashi(Hiroshima University), Y. Takenaga(Institute for Cosmic Ray Research), Y. Takeuchi(The University of Tokyo), K. Taki(The University of Tokyo), Y. Takubo(The University of Osaka), N. Tamura(Niigata University), M. Tanaka(High Energy Accelerator Research Organization), R. Terri(State University of New York), S. T’Jampens(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), A. Tornero-López(Instituto de Física Corpuscular), Y. Totsuka(High Energy Accelerator Research Organization), S. Ueda(Kyoto University), M. R. Vagins(University of California, Irvine), C. W. Walter(Duke University), W. Wang(Boston University), R. J. Wilkes(University of Washington), S. Yamada(Institute for Nuclear Research), S. Yamamoto(Kyoto University), C. Yanagisawa(State University of New York), N. Yershov(Institute for Nuclear Research), H. Yokoyama(Tokyo University of Science), M. Yokoyama(Kyoto University), J. Yoo(Seoul National University), M. Yoshida(The University of Osaka), J. Zalipska(National Centre for Nuclear Research)
Cited by 462Open Access
Abstract
We present results for ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy-dependent disappearance of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$, which we presume have oscillated to ${\ensuremath{\nu}}_{\ensuremath{\tau}}$. The probability that we would observe these results if there is no neutrino oscillation is 0.0050% ($4.0\ensuremath{\sigma}$).
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