T
T. Koya
Researcher at Toho University
Publications - 6
Citations - 95
T. Koya is an academic researcher from Toho University. The author has contributed to research in topics: Nuclear emulsion & Semileptonic decay. The author has an hindex of 5, co-authored 6 publications receiving 91 citations.
Papers
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Journal ArticleDOI
Upper limits for charm hadron decays to two muons plus hadrons
Koichi Kodama,N. Ushida,A. Mokhtarani,V. S. Paolone,J. T. Volk,J. O. Wilcox,P. M. Yager,R. M. Edelstein,A. P. Freyberger,D. B. Gibaut,R. J. Lipton,William R. Nichols,D. M. Potter,James Russ,C. Zhang,Y. Zhang,H. I. Jang,J. Y. Kim,T. I. Kim,I. T. Lim,M. Y. Pac,B. R. Baller,R. J. Stefanski,Kazuma Nakazawa,K. S. Chung,S. H. Chung,D. C. Kim,I. G. Park,M. S. Park,J. S. Song,C. S. Yoon,M. Aryal,N. W. Reay,R. A. Sidwell,N. R. Stanton,Michiyuki Chikawa,T. Abe,Terushige Fujii,G. Fujioka,K. Fujiwara,H. Fukushima,T. Hara,Y. Takahashi,K. Taruma,Y. Tsuzuki,C. Yokoyama,S. D. Chang,Byung Gu Cheon,J. H. Cho,J. S. Kang,C. O. Kim,K. Y. Kim,T. Y. Kim,J. C. Lee,S. B. Lee,G. Y. Lim,S. W. Nam,T. S. Shin,Kwang Souk Sim,J. K. Woo,Y. Isokane,Y. Tsuneoka,Shigeki Aoki,A. Gauthier,K. Hoshino,H. Kitamura,Makoto Kobayashi,Masahiro Komatsu,Motoaki Miyanishi,Kouji Nakamura,M. Nakamura,Y. Nakamura,S. Nakanishi,K. Niu,Kimio Niwa,M. Nomura,K. Okada,H. Tajima,T. Toshitou,S. Yoshida,J. M. Dunlea,S. G. Frederiksen,S. Kuramata,B. G. Lundberg,G. A. Oleynik,K. Reibel,K. Moriyama,H. Shibata,George R. Kalbfleisch,P. Skubic,J. Snow,S. E. Willis,O. Kusumoto,T. Okusawa,M. Teranaka,T. Tominaga,Tomoko Yoshida,H. Yuuki,H. Okabe,J. Yokota,M. Kazuno,T. Koya,E. Niu,S. Ogawa,H. Shibuya,S. Watanabe,N. Yasuda,M. Kamiya,Yoshihiro Sato,I. Tezuka,M. Yamaki,Saewoong Bahk,S. K. Kim +112 more
TL;DR: In this paper, a search for charm hadron decays into two muons plus one or more hadrons has been carried out using a hybrid emulsion spectrometer, which is sensitive to modes with missing neutrals, e.g. π0μ+μ− and ϱ±μ+m−, as well as to constrained modes having visible invariant masses equal to those of charm states.
Journal ArticleDOI
Measurement of B(Ds+ → μ+νμ)B(Ds+ → φμ+νμ) and determination of the decay constant fDs
K. Kodama,S Torikai,N. Ushida,A. Mokhtarani,V. Paolone,J. T. Volk,J. O. Wilcox,P. M. Yager,R. M. Edelstein,A. P. Freyberger,D. B. Gibaut,Ron Lipton,William R. Nichols,D. M. Potter,James Russ,C. Zhang,Y. Zhang,H. I. Jang,J. Y. Kim,B. Baller,R. J. Stefanski,Kazuma Nakazawa,S. H. Chung,M. S. Park,I. G. Park,J. S. Song,C. S. Yoon,M. Aryal,N. W. Reay,R. A. Sidwell,N. R. Stanton,S. Yoshida,Michiyuki Chikawa,T. Hara,Shigeki Aoki,K. Hoshino,Makoto Kobayashi,Masahiro Komatsu,Motoaki Miyanishi,M. Nakamura,S. Nakanishi,Kimio Niwa,M. Nomura,K. Okada,H. Tajima,K Teraoka,J. M. Dunlea,S. G. Frederiksen,S. Kuramata,B. G. Lundberg,G. A. Oleynik,K. Reibel,George R. Kalbfleisch,P. Skubic,J. Snow,S. E. Willis,K. Nakamura,T. Okusawa,Tomoko Yoshida,H. Okabe,J. Yokota,N Ihara,M. Kazuno,T. Koya,E. Niu,S. Ogawa,H. Shibuya,S. Watanabe,N. Yasuda,K Ehara,K Horie,Yoshihiro Sato,K Suzuki,I. Tezuka +73 more
TL;DR: In this article, the decays of Ds+ → μ+νμ from a sample of muonic one prong decay events detected in the emulsion target of Fermilab experiment E653 were observed.
Journal ArticleDOI
Measurement of B(D_s+ -> mu+ nu_mu)/B(D_s+ -> phi mu+ nu_mu) and Determination of the Decay Constant f_{D_s}
K. Kodama,S Torikai,N. Ushida,A. Mokhtarani,V. Paolone,J. T. Volk,J. O. Wilcox,P. M. Yager,R. M. Edelstein,A. P. Freyberger,D. B. Gibaut,Ron Lipton,William R. Nichols,D. M. Potter,James Russ,C. Zhang,Y. Zhang,H. I. Jang,J. Y. Kim,B. Baller,R. J. Stefanski,Kazuma Nakazawa,S. H. Chung,M. S. Park,I. G. Park,J. S. Song,C. S. Yoon,M. Aryal,N. W. Reay,R. A. Sidwell,N. R. Stanton,S. Yoshida,Michiyuki Chikawa,T. Hara,Shigeki Aoki,K. Hoshino,Makoto Kobayashi,Masahiro Komatsu,Motoaki Miyanishi,M. Nakamura,S. Nakanishi,Kimio Niwa,M. Nomura,K. Okada,H. Tajima,K Teraoka,J. M. Dunlea,S. G. Frederiksen,S. Kuramata,B. G. Lundberg,G. A. Oleynik,K. Reibel,George R. Kalbfleisch,P. Skubic,J. Snow,S. E. Willis,Kouji Nakamura,T. Okusawa,Tomoko Yoshida,H. Okabe,J. Yokota,N Ihara,M. Kazuno,T. Koya,E. Niu,S. Ogawa,H. Shibuya,S. Watanabe,N. Yasuda,K Ehara,K Horie,Yoshihiro Sato,K Suzuki,I.Tezuka +73 more
TL;DR: In this article, the decays of a sample of muonic one prong decay events detected in the emulsion target of Fermilab experiment E653 have been observed.
Journal ArticleDOI
Observation of D+ → ρ(770)0μ+v
Koichi Kodama,N. Ushida,A. Mokhtarani,V. S. Paolone,J. T. Volk,J. O. Wilcox,P. M. Yager,R. M. Edelstein,A. P. Freyberger,D. B. Gibaut,R. J. Lipton,William R. Nichols,D. M. Potter,J. Russ,C. Zhang,Y. Zhang,H. I. Jang,J. Y. Kim,T. I. Kim,I. T. Lim,M. Y. Pac,B. R. Baller,R. J. Stefanski,Kazuma Nakazawa,K. S. Chung,S. H. Chung,D. C. Kim,I. G. Park,M. S. Park,J. S. Song,C. S. Yoon,Michiyuki Chikawa,T. Abe,Shigeki Aoki,Terushige Fujii,G. Fujioka,K. Fujiwara,H. Fukushima,T. Hara,Y. Takahashi,K. Taruma,Y. Tsuzuki,C. Yokoyama,S. D. Chang,Byung Gu Cheon,J. H. Cho,J. S. Kang,C. O. Kim,K. Y. Kim,T. Y. Kim,J. C. Lee,S. B. Lee,G. Y. Lim,S. W. Nam,T. S. Shin,Kwang Souk Sim,J. K. Woo,Y. Isokane,Y. Tsuneoka,A. Gauthier,K. Hoshino,H. Kitamura,M. Kobayashi,M. Komatsu,M. Miyanishi,K. Nakamura,M. Nakamura,Y. Nakamura,S. Nakanishi,K. Niu,K. Niwa,M. Nomura,K. Okada,H. Tajima,T. Toshitou,S. Yoshida,M. Aryal,J. M. Dunlea,S. G. Frederiksen,S. Kuramata,B. G. Lundberg,G. A. Oleynik,N. W. Reay,K. Reibel,R. A. Sidwell,N. R. Stanton,K. Moriyama,H. Shibata,George R. Kalbfleisch,P. Skubic,J. M. Smow,S. E. Willis,O. Kusumoto,S. Ohashi,T. Okusawa,M. Teranaka,T. Tominaga,T. Yoshida,H. Yuuki,H. Okabe,J. Yokota,S. Ikegami,M. Kazuno,T. Koya,E. Niu,S. Ogawa,H. Shibuya,S. Watanabe,N. Yasuda,Yoshihiro Sato,M. Seshimo,I. Tezuka,Saewoong Bahk,S. K. Kim +113 more
TL;DR: In this article, the first observation of the Cabibo disfavored semileptonic decay mode D+ → ρ(770)0 μ+v and measure its decay rate relative to the Cabibbo favored mode D + → K ∗ (892) 0 μ + v was reported.
Journal ArticleDOI
New techniques for emulsion analysis in a hybrid experiment
Koichi Kodama,N. Ushida,A. Mokhtarani,V. S. Paolone,J. T. Volk,J. O. Wilcox,P. M. Yager,R. M. Edelstein,A. P. Freyberger,D. B. Gibaut,R. J. Lipton,William R. Nichols,D. M. Potter,James Russ,C. Zhang,Y. Zhang,H. I. Jang,J. Y. Kim,T. I. Kim,I. T. Lim,M. Y. Pac,B. R. Baller,R. J. Stefanski,Kazuma Nakazawa,K. S. Chung,S. H. Chung,D. C. Kim,I. G. Park,M. S. Park,J. S. Song,C. S. Yoon,S. Kuramata,Michiyuki Chikawa,Shigeki Aoki,T. Hara,Y. Takahashi,K. Taruma,S. D. Chang,D.G. Cheon,J. H. Cho,J. S. Kang,C. O. Kim,K. Y. Kim,T. Y. Kim,J. C. Lee,S. B. Lee,G. Y. Lim,S. W. Nam,T. S. Shin,Kwang Souk Sim,J. K. Woo,A. Gauthier,K. Hoshino,S. Ishikawa,Takayoshi Kawai,H. Kitamura,Koichi Kobayashi,Motoaki Miyanishi,Kouji Nakamura,M. Nakamura,Y. Nakamura,S. Nakanishi,Kimio Niwa,M. Nomura,H. Sasaki,H. Tajima,Yasuhiro Tomita,S. Yoshida,M. Aryal,J. M. Dunlea,S. G. Frederiksen,B. G. Lundberg,G. A. Oleynik,N. W. Reay,K. Reibel,R. A. Sidwell,N. R. Stanton,George R. Kalbfleisch,P. Skubic,J. Snow,S. E. Willis,S. Ohashi,T. Okusawa,M. Teranaka,T. Tominaga,Tomoko Yoshida,H. Okabe,J. Yokota,M. Adachi,S. Ikegami,M. Kazuno,T. Koya,E. Niu,H. Shibuya,S. Watanabe,Yoshihiro Sato,I. Tezuka,Saewoong Bahk,S. K. Kim +98 more
TL;DR: In this paper, a new method, called graphic scanning, was developed by the Nagoya University Group for emulsion analysis in a hybrid experiment, which enhances both speed and reliability of emulsion analyses.