Phys. Rev. D
74,
072003
(2006)
[39 pages]
Measurement of neutrino oscillation by the K2K experiment
M. H. Ahn et al. K2K Collaboration
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M. H. Ahn25, E. Aliu1, S. Andringa1, S. Aoki14, Y. Aoyama14, J. Argyriades5, K. Asakura14, R. Ashie30, F. Berghaus3, H. G. Berns34, H. Bhang25, A. Blondel9, S. Borghi9, J. Bouchez5, S. C. Boyd34, J. Burguet-Castell33, D. Casper4, J. Catala33, C. Cavata5, A. Cervera9, S. M. Chen32, K. O. Cho6, J. H. Choi6, U. Dore24, S. Echigo14, X. Espinal1, M. Fechner5, E. Fernandez1, K. Fujii14, Y. Fujii11, S. Fukuda30, Y. Fukuda19, J. Gomez-Cadenas33, R. Gran34, T. Hara14, M. Hasegawa16, T. Hasegawa27, K. Hayashi16, Y. Hayato30, R. L. Helmer32, I. Higuchi31, J. Hill28, K. Hiraide16, E. Hirose11, J. Hosaka30, A. K. Ichikawa11, M. Ieiri11, M. Iinuma12, A. Ikeda22, T. Inagaki16, T. Ishida11, K. Ishihara30, H. Ishii11, T. Ishii11, H. Ishino11, M. Ishitsuka31, Y. Itow20, T. Iwashita11, H. I. Jang6, J. S. Jang6, E. J. Jeon25, I. S. Jeong6, K. K. Joo25, G. Jover1, C. K. Jung28, T. Kajita31, J. Kameda30, K. Kaneyuki31, B. H. Kang25, I. Kato32, Y. Kato11, E. Kearns2, D. Kerr28, C. O. Kim15, M. Khabibullin13, A. Khotjantsev13, D. Kielczewska26,35, B. J. Kim25, H. I. Kim25, J. H. Kim25, J. Y. Kim6, S. B. Kim25, M. Kitamura14, P. Kitching32, K. Kobayashi28, T. Kobayashi11, M. Kohama14, A. Konaka32, Y. Koshio30, W. Kropp4, J. Kubota16, Yu. Kudenko13, G. Kume14, Y. Kuno23, Y. Kurimoto16, T. Kutter3,17, J. Learned10, S. Likhoded2, I. T. Lim6, S. H. Lim6, P. F. Loverre24, L. Ludovici24, H. Maesaka16, J. Mallet5, C. Mariani24, K. Martens28, T. Maruyama11, S. Matsuno10, V. Matveev13, C. Mauger28, K. B. McConnel Mahn18, C. McGrew28, S. Mikheyev13, M. Minakawa11, A. Minamino30, S. Mine4, O. Mineev13, C. Mitsuda30, G. Mitsuka31, M. Miura30, Y. Moriguchi14, T. Morita16, S. Moriyama30, T. Nakadaira11, M. Nakahata30, K. Nakamura11, I. Nakano22, F. Nakata14, T. Nakaya16, S. Nakayama31, T. Namba30, R. Nambu30, S. Nawang12, K. Nishikawa11, H. Nishino31, S. Nishiyama14, K. Nitta11, S. Noda14, H. Noumi11, F. Nova1, P. Novella33, Y. Obayashi30, A. Okada31, K. Okumura31, M. Okumura31, M. Onchi14, Ooyabu T.31, S. M. Oser3, T. Otaki14, Y. Oyama11, M. Y. Pac7, H. Park25, F. Pierre5, A. Rodriguez1, C. Saji31, A. Sakai11, M. Sakuda22, N. Sakurai30, F. Sanchez1, A. Sarrat28, T. Sasaki16, H. Sato16, K. Sato14, K. Scholberg8,18, R. Schroeter9, M. Sekiguchi14, E. Seo25, E. Sharkey28, A. Shima16, M. Shiozawa30, K. Shiraishi34, G. Sitjes33, M. Smy4, H. So25, H. Sobel4, M. Sorel33, J. Stone2, L. Sulak2, Y. Suga14, A. Suzuki14, Y. Suzuki30, Y. Suzuki11, M. Tada11, T. Takahashi12, M. Takasaki11, M. Takatsuki14, Y. Takenaga31, K. Takenaka14, H. Takeuchi30, Y. Takeuchi30, K. Taki30, Y. Takubo23, N. Tamura21, H. Tanaka16, K. Tanaka11, M. Tanaka11, Y. Tanaka14, K. Tashiro14, R. Terri28, S. T’Jampens5, A. Tornero-Lopez33, T. Toshito30, Y. Totsuka11, S. Ueda16, M. Vagins4, L. Whitehead28, C. W. Walter8, W. Wang2, R. J. Wilkes34, S. Yamada30, Y. Yamada11, S. Yamamoto16, Y. Yamanoi11, C. Yanagisawa28, N. Yershov13, H. Yokoyama29, M. Yokoyama16, J. Yoo25, M. Yoshida23, and J. Zalipska26 (K2K Collaboration)
1Institut de Fisica d’Altes Energies, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
2Department of Physics, Boston University, Boston, Massachusetts 02215, USA
3Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
4Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA
5DAPNIA, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
6Department of Physics, Chonnam National University, Kwangju 500-757, Korea
7Department of Physics, Dongshin University, Naju 520-714, Korea
8Department of Physics, Duke University, Durham, North Carolina 27708, USA
9DPNC, Section de Physique, University of Geneva, CH1211, Geneva 4, Switzerland
10Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
11High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
12Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8530, Japan
13Institute for Nuclear Research, Moscow 117312, Russia
14Kobe University, Kobe, Hyogo 657-8501, Japan
15Department of Physics, Korea University, Seoul 136-701, Korea
16Department of Physics, Kyoto University, Kyoto 606-8502, Japan
17Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA
18Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
19Department of Physics, Miyagi University of Education, Sendai 980-0845, Japan
20Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan
21Department of Physics, Niigata University, Niigata, Niigata 950-2181, Japan
22Department of Physics, Okayama University, Okayama, Okayama 700-8530, Japan
23Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
24University of Rome La Sapienza and INFN, I-000185 Rome, Italy
25Department of Physics, Seoul National University, Seoul 151-747, Korea
26A. Soltan Institute for Nuclear Studies, 00-681 Warsaw, Poland
27Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
28Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA
29Department of Physics, Tokyo University of Science, Noda, Chiba 278-0022, Japan
30Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan
31Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
32TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
33Instituto de Física Corpuscular, E-46071 Valencia, Spain
34Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
35Institute of Experimental Physics, Warsaw University, 00-681 Warsaw, Poland
Received 17 June 2006; published 12 October 2006
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 sin22θ=1 is between 1.9 and 3.5×10-3 eV2 at the 90% C.L. with a best-fit value of 2.8×10-3 eV2.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.74.072003
DOI:
10.1103/PhysRevD.74.072003
PACS:
14.60.Pq, 13.15.+g, 25.30.Pt, 95.55.Vj
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