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Physics Letters B | 1988

Cross-sections for Neutrino Production of Charmed Particles

N. Ushida; T. Kondo; S. Tasaka; I.G. Park; J.S. Song; T. Hara; Y. Homma; Y. Tsuzuki; G. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; K. Fujiwara; K. Taruma; S. Bahk; C. Kim; J. Park; D. C. Bailey; S. Conetti; P. Mercure; J. Trischuk; M. Turcotte; S. Aoki; K. Chiba; H. Fuchi; K. Hoshino; K. Kodama; R. Matsui; M. Miyanishi

Abstract We have found 122 charmed-particle decays among 3855 neutrino interactions located in the fiducial volume of a hybrid emulsion spectrometer installed in the Fermilab wide-band neutrino beam. We obtain an average relative charmed-particle production cross section of σ(ν μ → c μ − ) σ(ν μ →μ − ) =4.9 −0.6 +0.7 % , at an average neutrino energy of 22 GeV. We also obtain a production rate of σ(ν μ → c c ν μ ) σ(ν μ →ν μ ) =0.13 −0.11 +0.31 % , if we assume that there was an undetected muon, a limit of σ(ν μ → c c μ − ) σ(ν μ → c μ − ) CL ) can be obtained. Other cross section ratios and limits are also presented.


Nuclear Instruments and Methods in Physics Research | 1984

EXPERIMENTAL DETAILS ON LIFETIME MEASUREMENTS OF NEUTRINO PRODUCED CHARMED PARTICLES IN A TAGGED EMULSION SPECTROMETER

N. Ushida; T. Kondo; G. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; Y. Homma; Y. Tsuzuki; S. Bahk; C. Kim; J. Park; J. Song; D. C. Bailey; S. Conetti; J. Fisher; J. Trischuk; H. Fuchi; K. Noshino; M. Miyanishi; K. Niu; K. Niwa; H. Shibuya; Y. Yanagisawa; S. Errede; M. Gutzwiller; S. Kuramata; N.W. Reay; K. Reibel; T. A. Romanowski

Abstract A new type of hybrid appaatus, which consisted of an emulsion target and a magnet spectrometer, was successfully used in an experiment to measure lifetimes of charmed particles produced by the wide-band neutrino beam from 350 GeV protons at Fermilab. The emulsion target was essential to find short distance decay vertices andthe counter spectrometer was used both to localize the neutrino events in the emulsion and also to identify the particles from weak decays and those produced in the neutrino interactions. Newly introduced emulsion techniques such as the changeable sheet as a low background interface to couple the emulsion target with the counter spectrometer, and the single track followback method to locate interaction and decay vertices in the emulsion, were proved to be very powerful. Details of the experimental apparatus and of the method of analysis employed are described.


Physics Letters B | 1983

Charmed hadron production by neutrinos

N. Ushida; T. Kondo; F. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokohama; Y. Homma; Y. Tsuzuki; S. Bahk; C. Kim; J. Park; J. Song; D. C. Bailey; S. Conetti; J. Fischer; J. Trischuk; H. Fuchi; K. Hoshino; M. Miyanashi; K. Niu; K. Niwa; H. Shibuya; Y. Yanagisawa; S. Errede; M. Gutzwiller; S. Kuramata; N.W. Reay; K. Reibel; T. A. Romanowski

Abstract Charmed hadron production has been studied using a hybrid emulsion spectrometer in the Fermilab wide-band neutrino beam. The relative rates of D0, D+, F+, and Λ+c production have been measured - the fraction of D mesons is 69 ± 8 10 % . Momentum, transverse momentum, Feynman X, and fragmentation (Z) distributions are presented. The mean Z for charmed hadrons is 0.59 ± 0.03 (±0.03). Charmed target fragments have been observed.


Physics Letters B | 1988

Production characteristics of charmed particles in neutrino interactions

N. Ushida; T. Kondo; S. Tasaka; I.G. Park; J.S. Song; T. Hara; Y. Homma; Y. Tsuzuki; G. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; K. Fujiwara; K. Taruma; S. Bahk; C. Kim; J. Park; D. C. Bailey; S. Conetti; P. Mercure; J. Trischuk; M. Turcotte; S. Aoki; K. Chiba; H. Fuchi; K. Hoshino; K. Kodama; R. Matsui; M. Miyanishi

Abstract Using a hybrid emulsion spectrometer installed in the Fermilab wide-band neutrino beam, we located a total of 3855 neutrino interactions in the fiducial volume of our target. For 122 charmed-particle decays found in these interactions, we present distributions of x , y , charm-muon angular projection, Feynman- X , and the fragmentation Z . We find that the number of strange quarks in the nucleon sea is 4.2±2.1±2.6% of the number of down quarks.


Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 1994

New techniques for emulsion analysis in a hybrid experiment

K. 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; Richard Lipton; W.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. Baller; R. Stefanski; K. Nakazawa; K.S. Chung; S.H. Chung; D.C. Kim; I.G. Park; M.S. Park; J.S. Song

Abstract A new method, called graphic scanning, was developed by the Nagoya University Group for emulsion analysis in a hybrid experiment. This method enhances both speed and reliability of emulsion analysis. Details of the application of this technique to the analysis of Fermilab experiment E653 are described.


Physics Letters B | 1983

Cross sections for charm production by neutrinos

N. Ushida; T. Kondo; G. Fujioka; J. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; Y. Homma; Y. Tsuzuki; S. Bahk; C. Kim; J. Park; J. Song; D. C. Bailey; S. Conetti; J. Fischer; J. Trischuk; H. Fuchi; K. Hoshino; M. Miyanishi; K. Niu; K. Niwa; H. Shibuya; Y. Yanagisawa; S. Errede; M. Gutzwiller; S. Kuramata; N.W. Reay; K. Reibel; T. A. Romanowski

The production of charmed particles has been measured using a hybrid emulsion spectrometer in the Fermilab wide-band neutrino beam. The relative cross section for charged current charmed particle production is σ(v → μ−c)/σ(v → μ−) = 6.5 ±1.91.8%, and the energy dependence of the cross section is presented. One event with charm pair production was observed. A limit of σ(v → μcc)/σ(v → μc) < 6% (90% CL) is found for the ratio of charged current pair and single charm production.


Physical Review Letters | 1986

Lifetimes of the charmed particles D+/-, F+/-, and Lambda c+ produced by neutrinos.

N. Ushida; T. Kondo; S. Tasaka; I.G. Park; J. S. Song; T. Hara; Y. Homma; Y. Tsuzuki; G. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; K. Fujiwara; K. Taruma; S. Bahk; C. Kim; J. Park; D. C. Bailey; S. Conetti; P. Mercure; J. Trischuk; M. Turcotte; S. Aoki; K. Chiba; H. Fuchi; K. Hoshino; K. Kodama; R. Matsui; M. Miyanishi


Physical Review Letters | 1986

Lifetime of D0 charmed mesons produced in neutrino interactions

N. Ushida; T. Kondo; S. Tasaka; I.G. Park; J. S. Song; T. Hara; Y. Homma; Y. Tsuzuki; G. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; K. Fujiwara; K. Taruma; S. Bahk; C. Kim; J. Park; D. C. Bailey; S. Conetti; P. Mercure; J. Trischuk; M. Turcotte; S. Aoki; K. Chiba; H. Fuchi; K. Hoshino; K. Kodama; R. Matsui; M. Miyanishi


Physical Review Letters | 1986

Limits to, oscillations and, - direct coupling

N. Ushida; T. Kondo; S. Tasaka; I.G. Park; J. S. Song; T. Hara; Y. Homma; Y. Tsuzuki; G. Fujioka; H. Fukushima; Y. Takahashi; S. Tatsumi; C. Yokoyama; K. Fujiwara; K. Taruma; S. Bahk; C. Kim; J. Park; D. C. Bailey; S. Conetti; P. Mercure; J. Trischuk; M. Turcotte; S. Aoki; K. Chiba; H. Fuchi; K. Hoshino; K. Kodama; R. Matsui; M. Miyanishi

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N. Ushida

Aichi University of Education

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