H
H. Murata
Researcher at Tokyo Institute of Technology
Publications - 5
Citations - 99
H. Murata is an academic researcher from Tokyo Institute of Technology. The author has contributed to research in topics: Annihilation & Lepton. The author has an hindex of 5, co-authored 5 publications receiving 99 citations.
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Journal ArticleDOI
Measurements of R and a search for heavy-quark production in e+e- annihilation at sqrt s =50 and 52 GeV.
Hiroyuki Sagawa,T. Mori,Kazuo Abe,S. Chakrabarti,Y. Fujii,Yusuke Higashi,S. Ishimoto,Yoshimasa Kurihara,A. Maki,P. Mani,T. Nozaki,Tsunehiko Omori,P. Perez,Y. Sakai,Y. Sugimoto,Y. Takaiwa,Susumu Terada,Kiyosumi Tsuchiya,A. Bacala,R. Imlay,P. N. Kirk,W. Marterer,Rr Mcneil,W. Metcalf,C. P. Cheng,Z. P. Mao,Y. Yan,Y. T. Xu,H. S. Zhou,Y. C. Zhu,A. Abashian,K. Gotow,F. Kajino,F. Naito,F. T. Avignone,R. Childers,C. Darden,J. Edwards,S. Lusin,C. Rosenfeld,S. Wilson,D. R. Johnson,M. Frautschi,H. Kagan,R. D. Kass,C. G. Trahern,Hoyun Lee,Winston Ko,R. L. Lander,Kaori Maeshima,R. L. Malchow,D. Saroff,K. Sparks,M. C.S. Williams,A. Aldritch,James C. Green,I. H. Park,S. Sakamoto,F. Sannes,Steve Schnetzer,Robert Stone,S. Trentalange,D. Zimmerman,K. Miyano,H. Miyata,M. Ogawa,Y. Yamashita,D. Blanis,A. Bodek,H. S. Budd,R. Coombes,Sarah Catherine Eno,C. A. Fry,H. Harada,Y. H. Ho,Yongsun Kim,T. Kumita,S. L. Olsen,Ron Poling,N. M. Shaw,A. Sill,E. H. Thorndike,K. Ueno,H. W. Zheng,H. Asakura,K. Eguchi,H. Itoh,S. Kobayashi,A. Murakami,K. Toyoshima,J. S. Kang,Hyunyong Kim,S. K. Kim,S. S. Myung,E. J. Kim,G. N. Kim,Dong-Chul Son,H. Kozuka,S. Matsumoto,H. Otsuki,T. Sasaki,T. Takeda,R. Tanaka,R. Chiba,K. Hanaoka,S. Igarashi,M. Miyashita,H. Murata,H. Yokota,Y. Ishi,T. Ishizuka,T. Maruta,K. Ohta +112 more
TL;DR: A 95%-confidence-level upper limit is deduced for the production rate of new heavy charge +(2/3e or -(1/ 3e quarks to be 0.19 units of R) for hadronic final states.
Journal ArticleDOI
Search for isolated leptons in low-thrust e+e- annihilation events at square-root-s=50 and 52 gev
S. Igarashi,S. S. Myung,R. Chiba,K. Hanaoka,M. Miyashita,H. Murata,H. Yokota,A. Bacala,R. L. Imlay,P. N. Kirk,R. R. McNeil,W. Metcalf,C. P. Cheng,Z. P. Mao,Y. Yan,Y. T. Xu,H. S. Zhou,Y. C. Zhu,A. Abashian,K. Gotow,F. Kajino,F. Naito,R. Childers,C. W. Darden,J. Edwards,S. Lusin,C. Rosenfeld,S. Wilson,D. R. Johnson,M. Frautschi,H. Kagan,R. D. Kass,C. G. Trahern,Hoyun Lee,Winston Ko,R. L. Lander,Kaori Maeshima,R. L. Malchow,K. Sparks,M. C.S. Williams,Kazuo Abe,S. Chakrabarti,Y. Fujii,Yusuke Higashi,S. Ishimoto,Yoshimasa Kurihara,A. Maki,T. Nozaki,Tsunehiko Omori,P. Perez,Hiroyuki Sagawa,Y. Sakai,Yasuhiro Sugimoto,Y. Takaiwa,Susumu Terada,Kiyosumi Tsuchiya,R. Poling,A. Aldritch,James C. Green,I. H. Park,S. Sakamoto,F. Sannes,Steve Schnetzer,Robert Stone,S. Trentalange,D. Zimmerman,Kazumasa Miyano,H. Miyata,M. Ogawa,Y. Yamashita,D. Blanis,A. Bodek,H. S. Budd,R. Coombes,Sarah Catherine Eno,C. A. Fry,H. Harada,Y. H. Ho,Yongsun Kim,T. Kumita,T. Mori,S. L. Olsen,S. L. Olsen,N. M. Shaw,A. Sill,E. H. Thorndike,K. Ueno,H. W. Zheng,H. Asakura,K. Eguchi,H. Itoh,S. Kobayashi,A. Murakami,K. Toyoshima,J. S. Kang,Hyunyong Kim,S. K. Kim,M. H. Lee,E. J. Kim,G. N. Kim,Dong-Chul Son,H. Kozuka,S. Matsumoto,Takashi Sasaki,T. Takeda,Ryuki Tanaka,Y. Ishi,T. Ishizuka,T. Maruta,K. Ohta +109 more
TL;DR: The number of low-thrust events with isolated leptons is consistent with the expectation of the standard model with five quark flavors as discussed by the authors, and limits on the production of new quarks and leptonons are reported.
Journal ArticleDOI
Measurements of cross sections and charge asymmetries for e+e−→τ+τ−and e+e−→μ+μ−for s from 52 to 57 GeV
A. Bacala,R. L. Malchow,K. Sparks,R. Imlay,P. N. Kirk,Rr Mcneil,W. Metcalf,Winston Ko,R. L. Lander,Kaori Maeshima,J. R. Smith,M. C.S. Williams,C. P. Cheng,J. Li,Y. K. Li,Z. P. Mao,Y. Yan,Y. T. Xu,Y. C. Zhu,A. Abashian,K. Gotow,F. Kajino,E. H. Low,F. Naito,L. E. Piilonen,R. Childers,C. W. Darden,S. Lusin,C. Rosenfeld,A. T.M. Wang,S. Wilson,M. Frautschi,H. Kagan,R. D. Kass,C. G. Trahern,Kazuo Abe,S. Chakrabarti,Y. Fujii,Yusuke Higashi,Yoshimasa Kurihara,A. Maki,T. Nozaki,Tsunehiko Omori,P. Perez,Hiroyuki Sagawa,Y. Sakai,Y. Sugimoto,Y. Takaiwa,Susumu Terada,Kiyosumi Tsuchiya,R. Poling,James C. Green,I. H. Park,S. Sakamoto,F. Sannes,Steve Schnetzer,Robert Stone,S. Trentalange,D. Zimmerman,Kazumasa Miyano,H. Miyata,M. Ogawa,Y. Yamashita,D. Blanis,A. Bodek,H. S. Budd,R. Coombes,Sarah Catherine Eno,C. A. Fry,H. Harada,Y. H. Ho,Yongsun Kim,T. Kumita,T. Mori,S. L. Olsen,S. L. Olsen,N. M. Shaw,A. Sill,E. H. Thorndike,K. Ueno,H. W. Zheng,H. Asakura,K. Eguchi,H. Itoh,S. Kobayashi,A. Murakami,K. Toyoshima,J. S. Kang,Hyunyong Kim,S. K. Kim,M. H. Lee,S. S. Myung,E. J. Kim,G. N. Kim,Dong-Chul Son,H. Kozuka,S. Matsumoto,T. Sasaki,T. Takeda,R. Tanaka,R. Chiba,K. Hanaoka,S. Igarashi,H. Murata,H. Yokota,Y. Ishi,T. Ishizuka,K. Ohta +107 more
TL;DR: In this paper, the forward-backward asymmetries and total cross sections for these reactions are found to be in agreement with predictions of the standard model of the electro-weak interactions.
Journal ArticleDOI
Search for unstable heavy neutral leptons in e + e- annihilations at square-root-s from 50 to 60.8 gev
N. M. Shaw,D. Blanis,A. Bodek,H. S. Budd,R. Coombes,Sarah Catherine Eno,C. A. Fry,H. Harada,Y. H. Ho,Yongsun Kim,T. Kumita,T. Mori,S. L. Olsen,Alan Sill,E. H. Thorndike,K. Ueno,H. W. Zheng,R. L. Imlay,P. N. Kirk,J. Lim,R. R. McNeil,W. Metcalf,S. S. Myung,C. P. Cheng,P. Gu,J. Li,Y. K. Li,Z. P. Mao,Y. T. Xu,Y. C. Zhu,A. Abashian,K. Gotow,K. P. Hu,E. H. Low,M. E. Mattson,F. Naito,L. E. Piilonen,K. L. Sterner,S. Lusin,C. Rosenfeld,A. T.M. Wang,S. Wilson,M. Frautschi,H. Kagan,R. D. Kass,C. G. Trahern,Richard Breedon,G. N. Kim,Winston Ko,R. L. Lander,Kaori Maeshima,R. L. Malchow,J. R. Smith,K. Sparks,M. C.S. Williams,Kazuo Abe,Y. Fujii,Yusuke Higashi,S. K. Kim,Yoshimasa Kurihara,A. Maki,T. Nozaki,Tsunehiko Omori,Hiroyuki Sagawa,Y. Sakai,Yasuhiro Sugimoto,Y. Takaiwa,Susumu Terada,Kiyosumi Tsuchiya,R. C. Walker,F. Kajino,D. Perticone,R. Poling,T. L.T. Thomas,Y. Ishi,Kazumasa Miyano,H. Miyata,M. Ogawa,Takashi Sasaki,Y. Yamashita,A. Bacala,James C. Green,I. H. Park,S. Sakamoto,F. Sannes,Steve Schnetzer,Robert Stone,S. Trentalange,J. Vinson,H. Asakura,K. Eguchi,H. Ichinose,H. Itoh,S. Kobayashi,A. Murakami,K. Toyoshima,J. S. Kang,Hyunyong Kim,M. H. Lee,D. H. Han,E. J. Kim,Dong-Chul Son,T. Kojima,S. Matsumoto,Ryuki Tanaka,Y. Yamagishi,T. Yasuda,R. Chiba,K. Hanaoka,S. Igarashi,H. Murata,Hideo Yokota,T. Ishizuka,K. Ohta +113 more
TL;DR: A search for unstable heavy neutral leptons has been made at center-of-mass energies from 50 to 60.8 GeV with the AMY detector at the KEK Storage ring TRISTAN.
Journal ArticleDOI
Experimental mass limit for a fourth-generation sequential lepton from e+e- annihilations at s=56 GeV
G. N. Kim,E. J. Kim,Dong-Chul Son,A. Bacala,R. Imlay,P. N. Kirk,Rr Mcneil,W. Metcalf,C. P. Cheng,Z. P. Mao,Y. Yan,Y. T. Xu,Y. C. Zhu,A. Abashian,K. Gotow,F. Kajino,E. H. Low,F. Naito,L. E. Piilonen,R. Childers,C. Darden,S. Lusin,C. Rosenfeld,S. Wilson,M. Frautschi,H. Kagan,R. D. Kass,C. G. Trahern,Winston Ko,R. L. Lander,Kaori Maeshima,R. L. Malchow,Smith,K. Sparks,M. C.S. Williams,Kazuo Abe,S. Chakrabarti,Y. Fujii,Yasuo Higashi,Yoshimasa Kurihara,A. Maki,T. Nozaki,Tsunehiko Omori,P. Perez,Hiroyuki Sagawa,Y. Sakai,Y. Sugimoto,Y. Takaiwa,Susumu Terada,Kiyosumi Tsuchiya,R. Poling,James C. Green,I. H. Park,S. Sakamoto,F. Sannes,Steve Schnetzer,Robert Stone,S. Trentalange,D. Zimmerman,K. Miyano,H. Miyata,M. Ogawa,Y. Yamashita,D. Blanis,A. Bodek,H. S. Budd,R. Coombes,Sarah Catherine Eno,C. A. Fry,H. Harada,Y. H. Ho,Yk Kim,T. Kumita,T. Mori,S. L. Olsen,S. L. Olsen,N. M. Shaw,A. Sill,E. H. Thorndike,K. Ueno,H. W. Zheng,H. Asakura,K. Eguchi,H. Itoh,S. Kobayashi,A. Murakami,K. Toyoshima,J. S. Kang,Hj Kim,S. K. Kim,M. H. Lee,S. S. Myung,H. Kozuka,S. Matsumoto,T. Sasaki,T. Takeda,R. Tanaka,R. Chiba,K. Hanaoka,S. Igarashi,H. Murata,H. Yokota,Y. Ishi,T. Ishizuka,K. Ohta +104 more
TL;DR: In this article, a search for pair production for fourth-generation sequential leptons in e/sup +/e/sup -/ annihilation at a center-of-mass energy = 56 GeV is reported.