R. Tanaka
Chuo University
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Publication
Featured researches published by R. Tanaka.
Physics Letters B | 1992
R. Tanaka; T. Kojima; T. Sasaki; K. Tomioka; S. Matsumoto; Y. Oshi; K. Miyano; H. Miyata; P. Kirk; J. Lim; R.R. McNeil; S. S. Myung; C.P. Cheng; W.X. Gao; P. Gu; W.G. Yan; M.H. Ye; A. Abashian; K. Gotow; K.P. Hu; A.Z. Lai; E.H. Low; M. E. Mattson; L. E. Piilonen; K.L. Sterner; S. Lusin; C. Rosenfeld; A.T.M. Wang; S. Wilson; M. Frautschi
Abstract We present results of an experimental study of e + e − + hadrons in the kinematic regime for which the process is interpreted as hadron production in collisions of almost-real photons. The data sample corresponds to an integrated luminosity of 27.5 pb − and covers center-of-mass energies from 55 to 61.4 GeV. We observe more events than expected from the incoherent sum of quark-parton and vector-meson-dominance models, and we give a quantitative explanation of the excess by including the hard scattering of the hadronic constituents of the photons calculated with QCD.
Physics Letters B | 1990
Takashi Sasaki; Y. Yamagishi; R. Tanaka; T. Kojima; S. Matsumoto; T. Yasuda; Y. Ishi; K. Miyano; H. Miyata; P. Kirk; J. Lim; R.R. McNeil; W. Metcalf; S. S. Myung; C.P. Cheng; P. Gu; M.H. Ye; Y.C. Zhu; A. Abashian; K. Gotow; K.P. Hu; A.Z. Lai; E.H. Low; M. E. Mattson; L. E. Piilonen; K.L. Sterner; Y.K. Li; S. Lusin; C. Rosenfeld; A.T.M. Wang
Abstract The photon structure function F2 has been measured at average Q2 values of 73,160 and 390 ( GeV c ) 2 . We compare the x dependence of the Q2 = 73 ( GeV c ) 2 data with theoretical expectations based on QCD. In addition we present results on the Q2 evolution of the structure function for the intermediate x range (0.3⩽ x ⩽0.8). The results are consistent with QCD.
Physics Letters B | 1990
Gui Nyun Kim; R. Breedon; Winston Ko; R. Lander; K. Maeshima; R. Malchow; J. Smith; D. Stuart; R. Imlay; P. Kirk; J. Lim; R. R. McNeill; W. Metcalf; S. S. Myung; C.P. Cheng; P. Gu; J. Li; Y.K. Li; M.H. Ye; Y.C. Zhu; A. Abashian; K. Gotow; K.P. Hu; E.H. Low; M. E. Mattson; L. E. Piilonen; K.L. Sterner; S. Lusin; C. Rosenfeld; A.T.M. Wang
Abstract We report on a search for the pair production of leptoquarks and colored leptons in e + e − annihilations t center-of-mass energies from 50 to 60.8 GeV, using the AMY detector at TRISTAN. No evidence for such particles is found and 95% CL mass limits are given.
IEEE Transactions on Nuclear Science | 1989
Y. Fukushima; J. Shirai; Yoshinobu Unno; R. Tanaka; H. Murakami
New readout electronics for the Venus end-cap liquid argon calorimeter was developed and has been operating for over a year at TRISTAN. The entire system was designed in such a way that the gain of each readout channel could be calibrated to better than 1%. The system consists of 3840 channels of readout electronics. It uses hybrid charge-sensitive amplifiers located in the 7.5-kG magnetic field and TKO-bus-based electronics which consists of CR-(RC)/sup 4/ filters, sample-and-hold circuits and 14-bit ADCs (analog digital converters). The energy resolution sigma /sub E//E for an electromagnetic shower has been found to be 3.5% at 28 GeV without any channel-by-channel gain calibration. The resolution was also determined to be sigma E/E=1.4%+11.3%/ square root E(GeV) from a large sample of 28-GeV Bhabha events and a small sample of e/sup +/e/sup -/ to e/sup +/e/sup -/ gamma events. >
Physical Review D | 1990
Y.K. Li; J. Li; C.P. Cheng; P. Gu; M.H. Ye; Y.C. Zhu; R. Imlay; P. Kirk; J. Lim; R.R. McNeil; W. Metcalf; S. S. Myung; A. Abashian; K. Gotow; K.P. Hu; E.H. Low; M. E. Mattson; L. E. Piilonen; K.L. Sterner; S. Lusin; C. Rosenfeld; A.T.M. Wang; S. Wilson; M. Frautschi; H. Kagan; R. Kass; C.G. Trahern; R. Breedon; Gn Kim; Winston Ko
Physical Review D | 1990
H.W. Zheng; P. Perez; P. Auchincloss; D. Blanis; A. Bodek; H. S. Budd; Sarah Catherine Eno; C.A. Fry; H. Harada; Y.H. Ho; Yk Kim; T. Kumita; T. Mori; S. L. Olsen; N. M. Shaw; A. Sill; E. H. Thorndike; K. Ueno; R. Imlay; P. Kirk; J. Lim; R.R. McNeil; W. Metcalf; S. S. Myung; C.P. Cheng; P. Gu; J. Li; Y.K. Li; M.H. Ye; Y.C. Zhu
Physical Review D | 1990
T. Kumita; H. Sagawa; P. Auchincloss; D. Blanis; A. Bodek; H. S. Budd; Sarah Catherine Eno; C.A. Fry; H. Harada; Y.H. Ho; Yk Kim; T. Mori; S. L. Olsen; N. M. Shaw; A. Sill; E. H. Thorndike; K. Ueno; H.W. Zheng; Kazuo Abe; Y. Fujii; Y. Higashi; Sk Kim; Y. Kurihara; A. Maki; T. Nozaki; T. Omori; Y. Sakai; Y. Sugimoto; Y. Takaiwa; S. Terada
Physical Review Letters | 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. Hojo; Y. Homma; Y. Hoshi; Y. Ikegami; N. Ishihara; T. Kamitani; Nobuyuki Kanematsu; J. Kanzaki; R. Kikuchi; T. Kondo; T. Koseki; H. Kurashige
Physical Review D | 1990
Smith; R.R. McNeil; Re Breedon; Gn Kim; W. Ko; R. Lander; K. Maeshima; R. Malchow; Jeff Rowe; D. Stuart; R. Imlay; P. Kirk; J. Lim; W. Metcalf; S. S. Myung; C.P. Cheng; P. Gu; J. Li; Y.K. Li; M.H. Ye; Y.C. Zhu; A. Abashian; K. Gotow; K.P. Hu; E.H. Low; M. E. Mattson; L. E. Piilonen; K.L. Sterner; S. Lusin; C. Rosenfeld
