N. Sasao
Kyoto University
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Publication
Featured researches published by N. Sasao.
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%.
Physical Review D | 2010
J. K. Ahn; Y. Akune; V. Baranov; K. F. Chen; J. Comfort; M. Doroshenko; Y. Fujioka; Y. Hsiung; T. Inagaki; S. Ishibashi; N. Ishihara; H. Ishii; E. Iwai; T. Iwata; I. Kato; S. Kobayashi; S. Komatsu; T. K. Komatsubara; A. S. Kurilin; E. Kuzmin; A. Lednev; H. S. Lee; S. Y. Lee; G. Y. Lim; J. Ma; T. Matsumura; A. Moisseenko; H. Morii; T. Morimoto; Y. Nakajima
The first dedicated search for the rare neutral-kaon decay
Physics Letters B | 1987
Hajime Yoshida; Y. Chiba; I. Endo; I. Hayashibara; T. Ohsugi; A. Taketani; R. Tanaka; K. Amako; Y. Arai; Herbert Friedrich Boerner; M. Fukawa; Y. Fukushima; N. Ishihara; J. Kanzaki; T. Kondo; Keisuke Maehata; T. Matsui; S. Odaka; K. Ogawa; T. Ohama; H. Sakamoto; M. Sakuda; J. Shirai; T. Sumiyoshi; F. Suekane; Y. Teramoto; F. Takasaki; T. Tsuboyama; S. Uehara; Yoshinobu Unno
K_L^0\to\pi^0\nu\bar{\nu}
Physics Letters B | 1990
K. Abe; K. Amako; Y. Arai; Y. Asano; M. Chiba; Y. Chiba; M. Daigo; T. Emura; M. Fukawa; T. Fukui; Y. Fukushima; J. Haba; D. Haidt; I. Hayashibara; Y. Hemmi; M. Higuchi; T. Hirose; Y. Hojo; Y. Homma; Y. Hoshi; Y. Ikegami; N. Ishihara; T. Kamitani; Nobuyuki Kanematsu; J. Kanzaki; R. Kikuchi; T. Kondo; T. Koseki; H. Kurashige; T. Matsui
has been carried out in the E391a experiment at the KEK 12-GeV proton synchrotron. The final upper limit of 2.6
European Physical Journal C | 1989
K. Abe; K. Amako; Y. Arai; M. Fukawa; Y. Fukushima; N. Ishihara; D. Haidt; J. Kanzaki; T. Kondo; T. Matsui; S. Odaka; K. Ogawa; T. Ohama; H. Sakamoto; J. Shirai; T. Sumiyoshi; F. Takasaki; T. Tsuboyama; S. Uehara; Yoshinobu Unno; Y. Watase; Y. Yamada; Y. Asano; T. Koseki; S. Mori; M. Sakano; Y. Takada; Y. Yonezawa; M. Chiba; T. Fukui
\times 10^{-8}
Physical Review Letters | 2009
Y. C. Tung; Y. Hsiung; M. L. Wu; K. F. Chen; J. K. Ahn; Y. Akune; Baranov; J. Comfort; Doroshenko M; Y. Fujioka; T. Inagaki; S. Ishibashi; N. Ishihara; H. Ishii; E. Iwai; T. Iwata; I. Kato; S. Kobayashi; T. K. Komatsubara; A. S. Kurilin; E. Kuzmin; A. Lednev; H. S. Lee; S. Y. Lee; G. Y. Lim; J. Ma; T. Matsumura; A. Moisseenko; H. Morii; T. Morimoto
at the 90% confidence level was set on the branching ratio for the decay.
European Physical Journal A | 1989
K. Abe; Y. Ikegami; J. Kanzaki; N. Terunuma; R. Kikuchi; T. Koseki; S. Odaka; Y. Fukushima; A. Taketani; Y. Takada; T. Ohsugi; Y. Yamada; M. Sakano; Y. Asano; M. Wakai; T. Yamashita; S. Uehara; T. Oyama; Takashi Nakamura; N. Sasao; Nobuyuki Kanematsu; Yoshishige Suzuki; M. Higuchi; T. Watanabe; M. Utsumi; N. Ishihara; R. Tanaka; T. Yamagata; T. Hirose; Y. Hojyo
Abstract The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3 e .
Physical Review Letters | 2007
J. K. Ahn; J. Comfort; S. Kobayashi; E. Iwai; H. Nanjo; V. Baranov; T. Sumida; A. Moisseenko; Y. Sugaya; M. Sekimoto; H. Okuno; M. Nomachi; Haruki Watanabe; T. Matsumura; Y. C. Tung; T. Nakano; T. Shinkawa; T. Iwata; Y. W. Wah; K. Omata; N. Ishihara; G. Y. Lim; M. Yamaga; A. Sugiyama; Y. Yoshimura; A. S. Kurilin; T. Yamanaka; T. Nomura; K. Sakashita; H. Y. Yoshida
Abstract The relative production ratio of 3-jet events to the total number of hadronic events was studied in e+e− annihilations at centre-of-mass energies between 54 and 61.4 GeV. The QCD scale parameter has been determined to be Λ MS =254 −47 +55 ±56 MeV on the basis of a QCD cascade with the next-to-leading logarithmic approximation.
Physics Letters B | 1989
K. Abe; K. Amako; Y. Arai; Y. Asano; M. Chiba; Y. Chiba; M. Daigo; T. Emura; I. Endo; M. Fukawa; T. Fukui; Y. Fukushima; J. Haba; D. Haidt; I. Hayashibara; Y. Hemmi; M. Higuchi; T. Hirose; Y. Hojyo; Y. Homma; Y. Hoshi; Y. Ikegami; N. Ishihara; T. Kamitani; Nobuyuki Kanematsu; J. Kanzaki; R. Kikuchi; T. Kondo; T. Koseki; H. Kurashige
AbstractDifferential cross sections fore+e−→γγ have been measured at center-of-mass energies of 55, 56, 56.5 and 57 GeV. The results are in good agreement with those predicted by QED. Possible deviations from QED are studied in terms of contact interactions, and the limits on compositeness scales are obtained. Using events with a gramma pair in the final state, a search is made for the pair production of unstable photons,
Physics Letters B | 1990
K. Abe; K. Amako; Y. Arai; Y. Asano; Masami Chiba; Y. Chiba; M. Daigo; T. Emura; I. Endo; M. Fukawa; T. Fukui; Y. Fukushima; J. Haba; I. Hayashibara; Y. Hemmi; M. Higuchi; T. Hirose; Y. Hojyo; Y. Homma; Y. Hoshi; Y. Ikegami; N. Ishihara; T. Kamitani; Nobuyuki Kanematsu; J. Kanzaki; R. Kikuchi; T. Kondo; T. Koseki; K. Kubo; H. Kurashige