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

Ahn, Myunggeun; Aoki, S.; Bhang, H.; Boyd, S.; Casper, D.; Choi, J. H.; Fukuda, Satoshi; Fukuda, Y.; Gajewski, W.; Hara, T.; Hasegawa, M.; Hasegawa, T.; Hayato, Y.; Hill, J.; Ichikawa, A. K.; Ikeda, Akihiro; Inagaki, T.; Ishida, Toru; Ishii, T.; Ishitsuka, M.; Itow, Y.; Iwashita, T.; Jang, H. I.; Jang, J. S.; Jeon, E. J.; Jung, C. K.; Kajita, T.; Kameda, J.; Kaneyuki, K.; Kato, I.; Kearns, E.; Kibayashi, A.; Kiełczewska, D.; Kobayashi, Kazuyoshi; Kim, Beom Joon; Kim, C. O.; Kim, J. Y.; Kim, S. B.; Kobayashi, T.; Kohama, M.; Koshio, Y.; Kropp, W. R.; Learned, J. G.; Lim, S. H.; Lim, I. T.; 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, Shuichi; Obayashi, Y.; Okada, Atsushi; Ooyabu, T.; Oyama, Y.; Pac, M. Y.; Park, H.; Sakuda, M.; Sakurai, N.; Sasao, N.; Scholberg, K.; Sharkey, E.; Shiozawa, M.; So, Hyoungmin; Sobel, H. W.; Stachyra, A. L.; Stone, J. L.; Suga, Yuki; Sulak, Lawrence; Suzuki, Y.; Suzuki, Y.; Takeuchi, Y.; Tamura, N.; Toshito, T.; Totsuka, Y.; Vagins, M. R.; Walter, C. W.; Wilkes, R. J.; Yamada, S.; Yamamoto, S.; Yanagisawa, C.; Yokoyama, H.; Yoo, J.; Yoshida, M.; Zalipska, J.

doi:10.1103/physrevlett.90.041801

articlePhysical Review LettersJan 30, 2003GREEN OA

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

MAMyunggeun Ahn SAS. Aoki HBH. Bhang SBS. Boyd DCD. Casper

Seoul National University · Kobe University · +19 more institutions

PubMed

Indexed inarxivcrossrefpubmed

Abstract

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%.

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Topics & keywords

Topics

Keywords

Physics
Neutrino oscillation
Neutrino
Oscillation (cell signaling)
Particle physics
Solar neutrino problem
Flux (metallurgy)
Measurements of neutrino speed

UN Sustainable Development Goals

Affordable and clean energy

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