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Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance

2006; American Physical Society; Volume: 97; Issue: 17 Linguagem: Inglês

10.1103/physrevlett.97.171801

1092-0145

K. Abe, Y. Hayato, T. Iida, K. Ishihara, J. Kameda, Y. Koshio, A. Minamino, C. Mitsuda, M. Miura, S. Moriyama, M. Nakahata, Y. Obayashi, Hiroshi Ogawa, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takeuchi, K. Ueshima, I. Higuchi, C. Ishihara, M. Ishitsuka, T. Kajita, K. Kaneyuki, G. Mitsuka, S. Nakayama, H. Nishino, K. Okumura, C. Saji, Y. Takenaga, Y. Totsuka, Steven Vincent Clark, S. Desai, Frédéric Dufour, E. Kearns, S. Likhoded, M. Litos, J. L. Raaf, J. L. Stone, Lawrence Sulak, W. Wang, M. Goldhaber, D. Casper, J. P. Cravens, W. R. Kropp, D. W. Liu, S. Mine, C. Regis, M. Smy, H. W. Sobel, M. R. Vagins, K. S. Ganezer, James E. Hill, W. E. Keig, J. S. Jang, J. Y. Kim, I. T. Lim, K. Scholberg, N. Tanimoto, C. W. Walter, R. Wendell, R. W. Ellsworth, S. Tasaka, E. Guillian, J. G. Learned, S. Matsuno, M. D. Messier, A. K. Ichikawa, Toru Ishida, T. Ishii, T. Iwashita, T. Kobayashi, T. Nakadaira, K. Nakamura, Koh‐hei Nitta, Y. Oyama, Y. Suzuki, M. Hasegawa, I. Kato, H. Maesaka, T. Nakaya, K. Nishikawa, T. Sasaki, H. Sato, S. Yamamoto, M. Yokoyama, T. J. Haines, S. Dazeley, S. Hatakeyama, R. Svoboda, G. W. Sullivan, A. Habig, R. Gran, Y. Fukuda, Takuro Sato, Y. Itow, T. Koike, C. K. Jung, T. Kato, Kazuyoshi Kobayashi, M. Malek, C. McGrew, A. Sarrat, R. Terri, C. Yanagisawa, N. Tamura, M. Sakuda, M. Sugihara, Y. Kuno, M. Yoshida, S. B. Kim, J. Yoo, T. Ishizuka, H. Okazawa, Y. Choi, H. K. Seo, Y. Gando, T. Hasegawa, K. Inoue, H. Ishii, K. Nishijima, H. Ishino, Y. Watanabe, M. Koshiba, D. Kiełczewska, J. Zalipska, H. Berns, Kiyoshi Shiraishi, K. Washburn, R. J. Wilkes,

Particle physics theoretical and experimental studies

A search for the appearance of tau neutrinos from nu(mu) nu(tau) 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.