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Measurement of neutrino oscillation by the K2K experiment

  • M. H. Ahn
  • , E. Aliu
  • , S. Andringa
  • , S. Aoki
  • , Y. Aoyama
  • , J. Argyriades
  • , K. Asakura
  • , R. Ashie
  • , F. Berghaus
  • , H. G. Berns
  • , H. Bhang
  • , A. Blondel
  • , S. Borghi
  • , J. Bouchez
  • , S. C. Boyd
  • , J. Burguet-Castell
  • , D. Casper
  • , J. Catala
  • , C. Cavata
  • , A. Cervera
  • S. M. Chen, K. O. Cho, J. H. Choi, U. Dore, S. Echigo, X. Espinal, M. Fechner, E. Fernandez, K. Fujii, Y. Fujii, S. Fukuda, Y. Fukuda, J. Gomez-Cadenas, R. Gran, T. Hara, M. Hasegawa, T. Hasegawa, K. Hayashi, Y. Hayato, R. L. Helmer, I. Higuchi, J. Hill, K. Hiraide, E. Hirose, J. Hosaka, A. K. Ichikawa, M. Ieiri, M. Iinuma, A. Ikeda, T. Inagaki, T. Ishida, K. Ishihara, H. Ishii, T. Ishii, H. Ishino, M. Ishitsuka, Y. Itow, T. Iwashita, H. I. Jang, J. S. Jang, E. J. Jeon, I. S. Jeong, K. K. Joo, G. Jover, C. K. Jung, T. Kajita, J. Kameda, K. Kaneyuki, B. H. Kang, I. Kato, Y. Kato, E. Kearns, D. Kerr, C. O. Kim, M. Khabibullin, A. Khotjantsev, D. Kielczewska, B. J. Kim, H. I. Kim, J. H. Kim, J. Y. Kim, S. B. Kim, M. Kitamura, P. Kitching, K. Kobayashi, T. Kobayashi, M. Kohama, A. Konaka, Y. Koshio, W. Kropp, J. Kubota, Yu Kudenko, G. Kume, Y. Kuno, Y. Kurimoto, T. Kutter, J. Learned, S. Likhoded, I. T. Lim, S. H. Lim, P. F. Loverre, L. Ludovici, H. Maesaka, J. Mallet, C. Mariani, K. Martens, T. Maruyama, S. Matsuno, V. Matveev, C. Mauger, K. B. McConnel Mahn, C. McGrew, S. Mikheyev, M. Minakawa, A. Minamino, S. Mine, O. Mineev, C. Mitsuda, G. Mitsuka, M. Miura, Y. Moriguchi, T. Morita, S. Moriyama, T. Nakadaira, M. Nakahata, K. Nakamura, I. Nakano, F. Nakata, T. Nakaya, S. Nakayama, T. Namba, R. Nambu, S. Nawang, K. Nishikawa, H. Nishino, S. Nishiyama, K. Nitta, S. Noda, H. Noumi, F. Nova, P. Novella, Y. Obayashi, A. Okada, K. Okumura, M. Okumura, M. Onchi, Ooyabu T, S. M. Oser, T. Otaki, Y. Oyama, M. Y. Pac, H. Park, F. Pierre, A. Rodriguez, C. Saji, A. Sakai, M. Sakuda, N. Sakurai, F. Sanchez, A. Sarrat, T. Sasaki, H. Sato, K. Sato, K. Scholberg, R. Schroeter, M. Sekiguchi, E. Seo, E. Sharkey, A. Shima, M. Shiozawa, K. Shiraishi, G. Sitjes, M. Smy, H. So, H. Sobel, M. Sorel, J. Stone, L. Sulak, Y. Suga, A. Suzuki, Y. Suzuki, Y. Suzuki, M. Tada, T. Takahashi, M. Takasaki, M. Takatsuki, Y. Takenaga, K. Takenaka, H. Takeuchi, Y. Takeuchi, K. Taki, Y. Takubo, N. Tamura, H. Tanaka, K. Tanaka, M. Tanaka, Y. Tanaka, K. Tashiro, R. Terri, S. T'Jampens, A. Tornero-Lopez, T. Toshito, Y. Totsuka, S. Ueda, M. Vagins, L. Whitehead, C. W. Walter, W. Wang, R. J. Wilkes, S. Yamada, Y. Yamada, S. Yamamoto, Y. Yamanoi, C. Yanagisawa, N. Yershov, H. Yokoyama, M. Yokoyama, J. Yoo, M. Yoshida, J. Zalipska
  • Seoul National University
  • Autonomous University of Barcelona
  • Kobe University
  • CEA Saclay
  • The University of Tokyo
  • University of British Columbia
  • University of Washington
  • University of Geneva
  • Dept. Física At. Mol. y Nuclear
  • University of California at Irvine
  • TRIUMF
  • Chonnam National University
  • University of Rome La Sapienza
  • High Energy Accelerator Research Organization, Tsukuba
  • Miyagi University of Education
  • Kyoto University
  • Tohoku University
  • Stony Brook University
  • Hiroshima University
  • Okayama University
  • Nagoya University
  • Boston University
  • Korea University
  • Institute for Nuclear Research of the Russian Academy of Sciences
  • Andrzej Soltan Institute for Nuclear Studies
  • University of Warsaw
  • The University of Osaka
  • Louisiana State University
  • University of Hawai'i at Mānoa
  • Massachusetts Institute of Technology
  • Dongshin University
  • Duke University
  • Niigata University
  • Tokyo University of Science

Research output: Contribution to journalArticlepeer-review

757 Scopus citations

Abstract

We present measurements of νμ 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 158.1-8.6+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% (4.3σ). In a two-flavor oscillation scenario, the allowed Δm2 region at sin 22θ=1 is between 1.9 and 3.5×10-3eV2 at the 90% C.L. with a best-fit value of 2.8×10-3eV2.

Original languageEnglish
Article number072003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume74
Issue number7
DOIs
StatePublished - 2006

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