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Evidence for oscillation of atmospheric neutrinos

  • Y. Fukuda
  • , T. Hayakawa
  • , E. Ichihara
  • , K. Inoue
  • , K. Ishihara
  • , H. Ishino
  • , Y. Itow
  • , T. Kajita
  • , J. Kameda
  • , S. Kasuga
  • , K. Kobayashi
  • , Y. Kobayashi
  • , Y. Koshio
  • , M. Miura
  • , M. Nakahata
  • , S. Nakayama
  • , A. Okada
  • , K. Okumura
  • , N. Sakurai
  • , M. Shiozawa
  • Y. Suzuki, Y. Takeuchi, Y. Totsuka, S. Yamada, M. Earl, A. Habig, E. Kearns, M. D. Messier, K. Scholberg, J. L. Stone, L. R. Sulak, C. W. Walter, M. Goldhaber, T. Barszczxak, D. Casper, W. Gajewski, P. G. Halverson, J. Hsu, W. R. Kropp, L. R. Price, F. Reines, M. Smy, H. W. Sobel, M. R. Vagins, K. S. Ganezer, W. E. Keig, R. W. Ellsworth, S. Tasaka, J. W. Flanagan, A. Kibayashi, J. G. Learned, S. Matsuno, V. J. Stenger, D. Takemori, T. Ishii, J. Kanzaki, T. Kobayashi, S. Mine, K. Nakamura, K. Nishikawa, Y. Oyama, A. Sakai, M. Sakuda, O. Sasaki, S. Echigo, M. Kohama, A. T. Suzuki, T. J. Haines, E. Blaufuss, B. K. Kim, R. Sanford, R. Svoboda, M. L. Chen, Z. Conner, J. A. Goodman, G. W. Sullivan, J. Hill, C. K. Jung, K. Martens, C. Mauger, C. Mc Grew, E. Sharkey, B. Viren, C. Yanagisawa, W. Doki, K. Miyano, H. Okazawa, C. Saji, M. Takahata, Y. Nagashima, M. Takita, T. Yamaguchi, M. Yoshida, S. B. Kim, M. Etoh, K. Fujita, A. Hasegawa, T. Hasegawa, S. Hatakeyama, T. Iwamoto, M. Koga, T. Maruyama, H. Ogawa, J. Shirai, A. Suzuki, F. Tsushima, M. Koshiba, M. Nemoto, K. Nishijima, T. Futagami, Y. Hayato, Y. Kanaya, K. Kaneyuki, Y. Watanabe, D. Kielczewska, R. A. Doyle, J. S. George, A. L. Stachyra, L. L. Wai, R. J. Wilkes, K. K. Young
  • The University of Tokyo
  • Boston University
  • Brookhaven National Laboratory
  • University of California at Irvine
  • National Aeronautics and Space Administration
  • California State University Dominguez Hills
  • George Mason University
  • Gifu University
  • University of Hawai'i at Mānoa
  • High Energy Accelerator Research Organization, Tsukuba
  • High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
  • Kobe University
  • Los Alamos National Laboratory
  • Louisiana State University
  • University of Maryland, College Park
  • The University of Chicago
  • Stony Brook University
  • Niigata University
  • The University of Osaka
  • Seoul National University
  • Tohoku University
  • Tokai University
  • Institute of Science Tokyo
  • University of Warsaw
  • University of Washington
  • Stanford University

Research output: Contribution to journalArticlepeer-review

4937 Scopus citations

Abstract

We present an analysis of atmospheric neutrino data from a 33.0 kton yr (535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith angle dependent deficit of muon neutrinos which is inconsistent with expectations based on calculations of the atmospheric neutrino flux. Experimental biases and uncertainties in the prediction of neutrino fluxes and cross sections are unable to explain our observation. The data are consistent, however, with two-flavor νμ↔ντ oscillations with sin22θ>0.82 and 5×10−4<Δm2<6×10−3eV2 at 90% confidence level.

Original languageEnglish
Pages (from-to)1562-1567
Number of pages6
JournalPhysical Review Letters
Volume81
Issue number8
DOIs
StatePublished - 1998

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