Phys. Rev. Lett.
97,
171801
(2006)
[6 pages]
Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance
K. Abe et al. Super-Kamiokande Collaboration
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K. Abe1, Y. Hayato1, T. Iida1, K. Ishihara1, J. Kameda1, Y. Koshio1, A. Minamino1, C. Mitsuda1, M. Miura1, S. Moriyama1, M. Nakahata1, Y. Obayashi1, H. Ogawa1, M. Shiozawa1, Y. Suzuki1, A. Takeda1, Y. Takeuchi1, K. Ueshima1, I. Higuchi2, C. Ishihara2, M. Ishitsuka2, T. Kajita2, K. Kaneyuki2, G. Mitsuka2, S. Nakayama2, H. Nishino2, K. Okumura2, C. Saji2, Y. Takenaga2, Y. Totsuka2, S. Clark3, S. Desai3, F. Dufour3, E. Kearns3, S. Likhoded3, M. Litos3, J. L. Raaf3, J. L. Stone3, L. R. Sulak3, W. Wang3, M. Goldhaber4, D. Casper5, J. P. Cravens5, W. R. Kropp5, D. W. Liu5, S. Mine5, C. Regis5, M. B. Smy5, H. W. Sobel5, M. R. Vagins5, K. S. Ganezer6, J. E. Hill6, W. E. Keig6, J. S. Jang7, J. Y. Kim7, I. T. Lim7, K. Scholberg8, N. Tanimoto8, C. W. Walter8, R. Wendell8, R. W. Ellsworth9, S. Tasaka10, E. Guillian11, J. G. Learned11, S. Matsuno11, M. D. Messier12, A. K. Ichikawa13, T. Ishida13, T. Ishii13, T. Iwashita13, T. Kobayashi13, T. Nakadaira13, K. Nakamura13, K. Nitta13, Y. Oyama13, A. T. Suzuki14, M. Hasegawa15, I. Kato15, H. Maesaka15, T. Nakaya15, K. Nishikawa15, T. Sasaki15, H. Sato15, S. Yamamoto15, M. Yokoyama15, T. J. Haines16, S. Dazeley17, S. Hatakeyama17, R. Svoboda17, G. W. Sullivan18, A. Habig19, R. Gran19, Y. Fukuda20, T. Sato20, Y. Itow21, T. Koike21, C. K. Jung22, T. Kato22, K. Kobayashi22, M. Malek22, C. McGrew22, A. Sarrat1,22, R. Terri22, C. Yanagisawa22, N. Tamura23, M. Sakuda24, M. Sugihara24, Y. Kuno25, M. Yoshida25, S. B. Kim26, J. Yoo26, T. Ishizuka27, H. Okazawa28, Y. Choi29, H. K. Seo29, Y. Gando30, T. Hasegawa30, K. Inoue30, H. Ishii31, K. Nishijima31, H. Ishino32, Y. Watanabe32, M. Koshiba33, D. Kielczewska34,5, J. Zalipska34, H. G. Berns35, K. K. Shiraishi35, K. Washburn35, and R. J. Wilkes35 (Super-Kamiokande Collaboration)
1Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan
2Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
3Department of Physics, Boston University, Boston, Massachusetts 02215, USA
4Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
5Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA
6Department of Physics, California State University, Dominguez Hills, Carson, California 90747, USA
7Department of Physics, Chonnam National University, Kwangju 500-757, Korea
8Department of Physics, Duke University, Durham, North Carolina 27708, USA
9Department of Physics, George Mason University, Fairfax, Virginia 22030, USA
10Department of Physics, Gifu University, Gifu, Gifu 501-1193, Japan
11Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
12Department of Physics, Indiana University, Bloomington, Indiana 47405-7105, USA
13High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
14Department of Physics, Kobe University, Kobe, Hyogo 657-8501, Japan
15Department of Physics, Kyoto University, Kyoto 606-8502, Japan
16Physics Division, P-23, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
17Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
18Department of Physics, University of Maryland, College Park, Maryland 20742, USA
19Department of Physics, University of Minnesota, Duluth, Minnesota 55812-2496, USA
20Department of Physics, Miyagi University of Education, Sendai, Miyagi 980-0845, Japan
21Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan
22Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA
23Department of Physics, Niigata University, Niigata, Niigata 950-2181, Japan
24Department of Physics, Okayama University, Okayama, Okayama 700-8530, Japan
25Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
26Department of Physics, Seoul National University, Seoul 151-742, Korea
27Department of Systems Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8561, Japan
28Department of Informatics in Social Welfare, Shizuoka University of Welfare, Yaizu, Shizuoka 425-8611, Japan
29Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
30Research Center for Neutrino Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
31Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
32Department of Physics, Tokyo Institute for Technology, Meguro, Tokyo 152-8551, Japan
33University of Tokyo, Tokyo 113-0033, Japan
34Institute of Experimental Physics, Warsaw University, 00-681 Warsaw, Poland
35Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
Received 25 July 2006; published 23 October 2006
A search for the appearance of tau neutrinos from νμ↔ντ oscillations in the atmospheric neutrinos has been performed using 1489.2 days of atmospheric neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino appearance signal of 138±48(stat)-32+15(syst) events is obtained with an expectation of 78±26(syst). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.171801
DOI:
10.1103/PhysRevLett.97.171801
PACS:
14.60.Pq, 95.55.Vj, 95.85.Ry
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