Measurement of neutrino oscillation by the K2K experiment
Myunggeun Ahn(Seoul National University), E. Aliu(Universitat Autònoma de Barcelona), S. Andringa(Universitat Autònoma de Barcelona), S. Aoki(Kobe University), Yuya Aoyama(Kobe University), J. Argyriades(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), K. Asakura(Kobe University), R. Ashie(The University of Tokyo), F. Berghaus(University of British Columbia), 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), S. Boyd(University of Washington), J. Burguet–Castell(Instituto de Física Corpuscular), D. Casper(University of California, Irvine), J. Catala(Instituto de Física Corpuscular), C. Cavata(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), A. Cervera(University of Geneva), S. M. Chen(TRIUMF), K. O. Cho(Chonnam National University), J. H. Choi(Chonnam National University), U. Dore(Sapienza University of Rome), S. Echigo(Kobe University), X. Espinal(Universitat Autònoma de Barcelona), M. Fechner(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), E. Fernández(Universitat Autònoma de Barcelona), Kotaro Fujii(Kobe University), Y. Fujii(High Energy Accelerator Research Organization), Satoshi Fukuda(The University of Tokyo), 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), Kenji Hayashi(Kyoto University), Y. Hayato(The University of Tokyo), R. L. Helmer(TRIUMF), I. Higuchi(Institute for Cosmic Ray Research), J. Hill(State University of New York), K. Hiraide(Kyoto University), E. Hirose(High Energy Accelerator Research Organization), J. Hosaka(The University of Tokyo), A. K. Ichikawa(High Energy Accelerator Research Organization), M. Ieiri(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), H. Ishii(High Energy Accelerator Research Organization), T. Ishii(High Energy Accelerator Research Organization), H. Ishino(High Energy Accelerator Research Organization), M. Ishitsuka(Institute for Cosmic Ray Research), Y. Itow(Nagoya University), T. Iwashita(High Energy Accelerator Research Organization), H. I. Jang(Chonnam National University), J. S. 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), B. H. Kang(Seoul National University), I. Kato(TRIUMF), Y. Kato(High Energy Accelerator Research Organization), 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), B. J. Kim(Seoul National University), H. I. Kim(Seoul National University), J. H. Kim(Chonnam National University), J. Y. Kim(Chonnam National University), S. B. Kim(Seoul National University), M. Kitamura(Kobe University), P. Kitching(TRIUMF), Kazuyoshi Kobayashi(State University of New York), T. Kobayashi(High Energy Accelerator Research Organization), M. Kohama(Kobe University), 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), G. Kume(Kobe University), Y. Kuno(The University of Osaka), Yoshinori Kurimoto(Kyoto University), T. Kutter(Louisiana State University), J. G. Learned(University of Hawaii System), S. Likhoded(Boston University), I. T. Lim(Chonnam National University), Sung Hak 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), K. Martens(State University of New York), T. Maruyama(High Energy Accelerator Research Organization), S. Matsuno(University of Hawaii System), V. Matveev(Institute for Nuclear Research), C. Mauger(State University of New York), K. B. M. Mahn(Massachusetts Institute of Technology), C. McGrew(State University of New York), S. Mikheyev(Institute for Nuclear Research), M. Minakawa(High Energy Accelerator Research Organization), A. Minamino(The University of Tokyo), S. Mine(University of California, Irvine), O. Mineev(Institute for Nuclear Research), C. Mitsuda(The University of Tokyo), G. Mitsuka(Institute for Cosmic Ray Research), M. Miura(The University of Tokyo), Y. Moriguchi(Kobe University), T. Morita(Kyoto University), S. Moriyama(The University of Tokyo), T. Nakadaira(High Energy Accelerator Research Organization), M. Nakahata(The University of Tokyo), K. Nakamura(High Energy Accelerator Research Organization), I. Nakano(Okayama University of Science), F. Nakata(Kobe University), 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(High Energy Accelerator Research Organization), H. Nishino(Institute for Cosmic Ray Research), S. Nishiyama(Kobe University), Koh‐hei Nitta(High Energy Accelerator Research Organization), Shuichi Noda(Kobe University), H. Noumi(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), M. Okumura(Institute for Cosmic Ray Research), M. Onchi(Kobe University), T. Ooyabu(Institute for Cosmic Ray Research), S. M. Oser(University of British Columbia), T. Otaki(Kobe University), Y. Oyama(High Energy Accelerator Research Organization), M. Y. Pac(Dongshin University), H. Park(Seoul National 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), Akito Sakai(High Energy Accelerator Research Organization), M. Sakuda(Okayama University of Science), N. Sakurai(The University of Tokyo), F. Sánchez(Universitat Autònoma de Barcelona), A. Sarrat(State University of New York), T. Sasaki(Kyoto University), H. Sato(Kyoto University), K. Satô(Kobe University), K. Scholberg(Duke University), R. Schroeter(University of Geneva), M. Sekiguchi(Kobe University), E. S. Seo(Seoul National University), E. Sharkey(State University of New York), Asuka Shima(Kyoto University), M. Shiozawa(The University of Tokyo), Kiyoshi Shiraishi(University of Washington), G. Sitjes(Instituto de Física Corpuscular), M. Smy(University of California, Irvine), Hyoungmin So(Seoul National University), H. Sobel(University of California, Irvine), M. Sorel(Instituto de Física Corpuscular), J. L. Stone(Boston University), L. Sulak(Boston University), Yuki Suga(Kobe University), Y. Suzuki(Kobe University), Y. Suzuki(High Energy Accelerator Research Organization), Y. Suzuki(High Energy Accelerator Research Organization), M. Tada(High Energy Accelerator Research Organization), Takuya Takahashi(Hiroshima University), M. Takasaki(High Energy Accelerator Research Organization), M. Takatsuki(Kobe University), Y. Takenaga(Institute for Cosmic Ray Research), K. Takenaka(Kobe University), H. Takeuchi(The University of Tokyo), Y. Takeuchi(The University of Tokyo), K. Taki(The University of Tokyo), Y. Takubo(The University of Osaka), N. Tamura(Niigata University), H. Tanaka(Kyoto University), К. Таnака(High Energy Accelerator Research Organization), M. Tanaka(High Energy Accelerator Research Organization), Y. Tanaka(Kobe University), K. Tashiro(Kobe University), 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), T. Toshito(The University of Tokyo), Y. Totsuka(High Energy Accelerator Research Organization), S. Ueda(Kyoto University), M. R. Vagins(University of California, Irvine), L. Whitehead(State University of New York), C. W. Walter(Duke University), W. Wang(Boston University), R. J. Wilkes(University of Washington), S. Yamada(The University of Tokyo), Y. Yamada(High Energy Accelerator Research Organization), S. Yamamoto(Kyoto University), Y. Yamanoi(High Energy Accelerator Research Organization), 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)
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology
October 12, 2006
Cited by 666Open Access
Abstract
We present measurements of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment. One-hundred and twelve beam-originated neutrino events are observed in the fiducial volume of Super-Kamiokande with an expectation of ${158.1}_{\ensuremath{-}8.6}^{+9.2}$ events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muonlike events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% ($4.3\ensuremath{\sigma}$). In a two-flavor oscillation scenario, the allowed $\ensuremath{\Delta}{m}^{2}$ region at ${sin}^{2}2\ensuremath{\theta}=1$ is between 1.9 and $3.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }{\mathrm{eV}}^{2}$ at the 90% C.L. with a best-fit value of $2.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }{\mathrm{eV}}^{2}$.
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