Indications of neutrino oscillation in a 250 km long-baseline experiment.

Published

Journal Article

The K2K experiment observes indications of neutrino oscillation: a reduction of nu(mu) 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 80.1(+6.2)(-5.4). Twenty-nine one ring mu-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%.

Full Text

Duke Authors

Cited Authors

  • Ahn, MH; Aoki, S; Bhang, H; Boyd, S; Casper, D; Choi, JH; Fukuda, S; Fukuda, Y; Gajewski, W; Hara, T; Hasegawa, M; Hasegawa, T; Hayato, Y; Hill, J; Ichikawa, AK; Ikeda, A; Inagaki, T; Ishida, T; Ishii, T; Ishitsuka, M; Itow, Y; Iwashita, T; Jang, HI; Jang, JS; Jeon, EJ; Jung, CK; Kajita, T; Kameda, J; Kaneyuki, K; Kato, I; Kearns, E; Kibayashi, A; Kielczewska, D; Kobayashi, K; Kim, BJ; Kim, CO; Kim, JY; Kim, SB; Kobayashi, T; Kohama, M; Koshio, Y; Kropp, WR; Learned, JG; Lim, SH; Lim, IT; Maesaka, H; Martens, K; Maruyama, T; Matsuno, S; Mauger, C; McGrew, C; Mine, S; Miura, M; Miyano, K; Moriyama, S; Nakahata, M; Nakamura, K; Nakano, I; Nakata, F; Nakaya, T; Nakayama, S; Namba, T; Nishikawa, K; Nishiyama, S; Noda, S; Obayashi, A; Okada, A; Ooyabu, T; Oyama, Y; Pac, MY; Park, H; Sakuda, M; Sakurai, N; Sasao, N; Scholberg, K; Sharkey, E; Shiozawa, M; So, H; Sobel, HW; Stachyra, A; Stone, JL; Suga, Y; Sulak, LR; Suzuki, A; Suzuki, Y; Takeuchi, Y; Tamura, N; Toshito, T; Totsuka, Y; Vagins, MR; Walter, CW; Wilkes, RJ; Yamada, S; Yamamoto, S; Yanagisawa, C; Yokoyama, H; Yoo, J; Yoshida, M; Zalipska, J

Published Date

  • January 30, 2003

Published In

Volume / Issue

  • 90 / 4

Start / End Page

  • 041801 -

PubMed ID

  • 12570410

Pubmed Central ID

  • 12570410

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.90.041801

Language

  • eng