F. Minakawa
Toho University
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Featured researches published by F. Minakawa.
Physics Letters B | 1987
S. Aoki; R. Arnold; G. Baroni; M. Barth; J.H. Bartley; G. Bertrand-Coremans; V. Bisi; A.C. Breslin; G. Carboni; E. Chesi; K. Chiba; M. Coupland; G. Crosetti; D.H. Davis; S. Dell'Uomo; S. Di Liberto; W. Donnelly; M. J. Esten; D. Gamba; C. Gerke; P. Giubellino; M. Hazama; F.F. Heymann; K. Hoshino; D.C. Imrie; Y. Isokane; M. Kazuno; M. Kobayashi; K. Kodama; G.J. Lush
Abstract Evidence is reported for the simultaneous production of four charmed particles in interactions induced by 350 GeV/ c π − mesons in stacks of nuclear emulsions. The events were found during a search for beauty particles among a sample of about 200 interactions with candidates for charmed particles. The events selected required the presence of at least one muon with a high component of momentum transverse to the beam direction.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1989
S. Aoki; R. Arnold; G. Baroni; M. Barth; J.H. Bartley; Daniel Bertrand; G. Bertrand-Coremans; V. Bisi; A.C. Breslin; G. Carboni; M.G. Catanesi; A.M. Cecchetti; E. Chesi; K. Chiba; M. Coupland; D.H. Davis; S. Dell'Uomo; M. De Vincenzi; S. Di Liberto; W. Donnelly; B.G. Duff; M.J. Esten; A. Frenkel; D. Gamba; C. Gerke; P. Giubellino; M. Hazama; F.F. Heymann; K. Hoshino; D.C. Imrie
We give here a detailed description of experiment WA75, which was performed at CERN to search for beauty particles. Events containing at least one muon with a high momentum transverse to the beam direction were selected; then the primary interactions and decay vertices, located in stacks of nuclear research emulsions, were examined and analysed. The various parts of the apparatus are described and the off-line analysis and search in emulsion are discussed. An estimate is made of the sensitivity of the experiment to beauty- and charmed-particle production.
Physics Letters B | 1988
S. Aoki; R. Arnold; G. Baroni; M. Barth; G. Bertrand-Coremans; V. Bisi; A.C. Breslin; G. Carboni; E. Chesi; K. Chiba; D. Creanza; D.H. Davis; S. Dell'Uomo; M. De Vincenzi; S. Diliberto; M.J. Esten; D. Gamba; C. Gerke; P. Giubellino; M. Hazama; K. Hoshino; Y. Isokane; M. Kazuno; M. Kobayashi; K. Kodama; Y. Maeda; A. Manfredini; G. Martellotti; A. Marzari-Chiesa; M. A. Mazzoni
Abstract The azimuthal correlation distribution of 102 charmed-particle pairs observed in the hybrid emulsion experiment WA75 is compared with theoretical predictions. The various pairs - (D − D 0 ), (D − D + ), (D 0 D 0 ) and (D + D 0 )-all s how, within statistical error, the same azimuthal correlation distribution, demonstrating its independence from the specific nature of the production channel. Among the decays of 150 charged charmed particles and 138 neutral ones seen, higher multiplicities are favoured for hadronic as opposed to semileptonic decays. The data are consistent with the muonic decays of charged D mesons proceeding through the channels (μ ± , v, K 0 ) and [μ ± , v, K ∗0 (892)] , the fraction through K 0 being 0.76±0.06.
Physics Letters B | 1989
S. Aoki; A.C. Breslin; D.H. Davis; K. Hoshino; R. Ihara; M. Imada; T. Ishigami; M. Kazuno; H. Kitamura; M. Kobayashi; K. Kodama; Y. Maeda; A. Marzari-Chiesa; M. Masera; M. A. Mazzoni; F. Meddi; F. Minakawa; M. Miyanishi; M.T. Muciaccia; K. Nakamura; M. Nakamura; S. Nakanishi; Kazuma Nakazawa; K. Niu; K. Niwa; M. Nomura; H. Okabe; G. Poulard; G. Romano; G. Rosa
Abstract The production of charmed particles has been detected in 200 GeV per nucleon 16 O-emulsion central interactions. Their production cross section in elementary nucleon-nucleon processes has been estimated to be charm = [14.1±9.3(stat.) −8.4 +5.6 (syst.)] μ b.
Review of Scientific Instruments | 1994
S. Aoki; C. Kim; S. Hirata; M. Miyanishi; I. Tezuka; M. Ieiri; Y. Maeda; J. Yokota; Park; K. Hoshino; H. Shibuya; F. Minakawa; S.Y. Bahk; S.H. Chung; J. Y. Kim; Hirohiko M. Shimizu; R. Takashima; M. Teranaka; Y. Ueda; C. Nagoshi; K. Niu; K. Imai; C.H. Hahn; Y. Matsuda; M. Nakamura; J.S. Song; T.C. Kim; K. Niwa; H. Okabe; K.S. Chung
年会講演予稿集 | 1989
正治 家入; K.H. Tanaka; M. Takasaki; M. Minakawa; Y. Yamanoi; Y. Kato; H. Ishii; Y. Suzuki; T. Iijima; Hirohiko M. Shimizu; Takafumi Nakano; S. Hirata; H. Togawa; K. Imai; A. Masaike; Hideo Kitamura; S. Nakanishi; M. Kobayashi; Hiroyasu Tajima; K. Kodama; S. Aoki; M. Nakamura; M. Miyanishi; K. Niwa; K. Hoshino; K. Niu; M. Kazuno; H. Shibuya; F. Minakawa; S. Watanabe
