Indications of Neutrino Oscillation in a 250 km Long-Baseline Experiment

M. H. Ahn, S. Aoki, H. Bhang, S. Boyd, D. Casper, J. H. Choi, S. Fukuda, Y. Fukuda, W. Gajewski, T. Hara, M. Hasegawa, T. Hasegawa, Y. Hayato, J. Hill, A. K. Ichikawa, A. Ikeda, T. Inagaki, T. Ishida, T. Ishii, M. IshitsukaY. Itow, T. Iwashita, H. I. Jang, J. S. Jang, E. J. Jeon, C. K. Jung, T. Kajita, J. Kameda, K. Kaneyuki, I. Kato, E. Kearns, A. Kibayashi, D. Kielczewska, K. Kobayashi, B. J. Kim, C. O. Kim, J. Y. Kim, S. B. Kim, T. Kobayashi, M. Kohama, Y. Koshio, W. R. Kropp, J. G. Learned, S. H. Lim, I. T. Lim, H. Maesaka, K. Martens, T. Maruyama, S. Matsuno, C. Mauger, C. McGrew, S. Mine, M. Miura, K. Miyano, S. Moriyama, M. Nakahata, K. Nakamura, I. Nakano, F. Nakata, T. Nakaya, S. Nakayama, T. Namba, K. Nishikawa, S. Nishiyama, S. Noda, A. Obayashi, A. Okada, T. Ooyabu, Y. Oyama, M. Y. Pac, H. Park, M. Sakuda, N. Sakurai, N. Sasao, K. Scholberg, E. Sharkey, M. Shiozawa, H. So, H. W. Sobel, A. Stachyra, J. L. Stone, Y. Suga, L. R. Sulak, A. Suzuki, Y. Suzuki, Y. Takeuchi, N. Tamura, T. Toshito, Y. Totsuka, M. R. Vagins, C. W. Walter, R. J. Wilkes, S. Yamada, S. Yamamoto, C. Yanagisawa, H. Yokoyama, J. Yoo, M. Yoshida, J. Zalipska

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The K2K experiment observes indications of neutrino oscillation: a reduction of [Formula presented] flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of [Formula presented]. Twenty-nine one ring [Formula presented]-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%.

Original languageEnglish
Pages (from-to)5
Number of pages1
JournalPhysical Review Letters
Volume90
Issue number4
DOIs
Publication statusPublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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