Y. Hayato
KEK
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Publication
Featured researches published by Y. Hayato.
Physical Review Letters | 2003
M. H. Ahn; S. Aoki; Hyoung Chan Bhang; S. Boyd; David William Casper; Jin-Oh Choi; Satoru Fukuda; Y. Fukuda; W. Gajewski; T. Hara; M. Hasegawa; T. Hasegawa; Y. Hayato; J. Hill; Atsushi Ichikawa; A. Ikeda; T. Inagaki; T. Ishida; T. Ishii; M. Ishitsuka; Y. Itow; T. Iwashita; H.I. Jang; J. S. Jang; E. J. Jeon; C. K. Jung; T. Kajita; J. Kameda; K. Kaneyuki; I. Kato
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%.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2004
K. Nitta; E. Aliu; S. Andringa; S. Aoki; Seonho Choi; U. Dore; X. Espinal; J.J. Gómez-Cadenas; R. Gran; M. Hasegawa; Kouichi Hayashi; Y. Hayato; K. Hiraide; A. Ichikawa; Masataka Iinuma; J. S. Jang; E.J. Jeon; K.K. Joo; C. K. Jung; I. Kato; D. Kerr; J.Y Kim; S. B. Kim; K. Kobayashi; Akitsugu Kohara; J. Kubota; Y. Kudenko; Y. Kuno; M.J. Lee; E. Lessac-Chenin
A new near detector, SciBar, for the K2K long-baseline neutrino oscillation expe riment was installed to improve the measurement of neutrino energy spectrum and to study neutrino interactions in the energy region around 1 GeV. SciBar is a fully active tracking detector with fine segmentation consisting of plastic scintillator bars. The detector was constructed in summer 2003 and is taking data since October 2003. The basic design and initial performance is presented.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2002
T. Ishii; T. Inagaki; J Breault; T Chikamatsu; Jin-Oh Choi; T. Hasegawa; Y. Hayato; T. Ishida; H.I. Jang; J. S. Jang; E.M Jeong; I. Kato; A Kibayashi; B.J Kim; Hyojoon Kim; J.Y Kim; S. B. Kim; T. Kobayashi; W. R. Kropp; H.K Lee; S.B Lee; I.T. Lim; K.J Ma; Tomoyuki Maruyama; S. Mine; K. Nakamura; M Nakamura; I. Nakano; K. Nishikawa; Y. Oyama
A muon range detector (MRD) has been constructed as a near detector for the KEK-to-Kamioka long-baseline neutrino experiment (K2K). It monitors the neutrino beam properties at the near site by measuring the energy, angle and production point of muons produced by charged-current neutrino interaction. The detector has been working stably since the start of the K2K experiment.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2002
T. Ishii; T. Inagaki; J Breault; T Chikamatsu; Jin-Oh Choi; T. Hasegawa; Y. Hayato; T. Ishida; H.I. Jang; J. S. Jang; E.M Jeong; I. Kato; A Kibayashi; B.J Kim; Hyun-Jeong Kim; J. Y. Kim; S. B. Kim; T. Kobayashi; W. R. Kropp; H.K Lee; S.B Lee; I. T. Lim; K.J Ma; Tomoyuki Maruyama; S. Mine; K. Nakamura; M Nakamura; I. Nakano; K. Nishikawa; Y. Oyama
