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Study of high energy nuclear reactions based on quantum chromodynamics

Research Project

Project/Area Number 05640330
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 素粒子・核・宇宙線
Research InstitutionThe University of Tokyo

Principal Investigator

YAZAKI Koichi  The University of Tokyo, Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (60012382)

Co-Investigator(Kenkyū-buntansha) BENTZ Wolfgang  The University of Tokyo, Graduate School of Science, Research Associate, 大学院・理学系研究科, 助手 (20168769)
Project Period (FY) 1993 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1994: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1993: ¥800,000 (Direct Cost: ¥800,000)
KeywordsNJL model / mean field approach / Faddeev approach / pion exchange / nuclear transparency / color transparency / relativistic harmonic oscillator model / H-dibaryon / NJL模型 / 相対論的Faddeev方程式 / nuclear transparency / colar transparency / 核子の内部構造 / Faddeev方程式 / 核透明度 / グラウバー近似 / モンテ・カルロ法 / クォーク・クラスター模型 / 南部・ジョナラジニオ模型
Research Abstract

High energy nuclear reaction has two aspects, one related to perturbative QCD through elementary processes at large momentum transfers and the other related to non- perturbative QCD through the internal structure of participating hadrons and their initial and final state interactions. In this research project, the Nambu Jona- Lasino model has been studied as a relativistic model of the nucleon internal structure. The nuclear transparency which is a measure of initial and final state interactions and the H-dibaryon in nuclear matter have been also studied as means of observing the internal structure in high energy reactions.
In the study of the NJL model, we have calculated the quark scalar density, the axial vector coupling constant and the magnetic moment of the nucleon in order to examine the properties of the solution for th relativistic Faddeev equation and confirmed that the observed properties of the nucleon are globally reproduced. We have also made a comparison between the three … More -quark picture based on the Faddeev approach and the soliton picture based on the mean field approach. It has been found that the inclusion of the two-body correlation in the mean field approach may solve the long-standing problem about the stability of the solution and the pion exchange between the quarks gives an important contribution in the Faddeev approach.
As for the nuclear transparency, the relativistic effect has been found to suppress the expansion rate of the proton squeezed by the large momentum transfer and play an essential role in the color transparency. A relativistic harmonic oscillator quark model has been used to study the above suppression. The extension of the study to the cases of hadronic quasi-elastic processes such as (p, 2p) and (pi, pi'p) are under way.
H-dibaryon in nuclear matter has been studied by the Brueckner theory based on the H-nucleon interaction we obtained previously and the effective mass and the well depth have been calculated. The effects of H-LAMBDALAMBDA coupling have been also examined. Less

Report

(4 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • 1993 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] T.Sakai: "H-dibaryon in nuclear matter" Nucl. Phys. A. 594. 247-262 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] N. Ishii: "Baryons in the NJL model as solutions of the relativistic Faddeev equation" Nucl. Phys. A. 587. 617-656 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G. Hejc: "EOS of nuclear matter at finite temperature and density in the 1/N expansion of the relativistic-δ-ω model" Nucl. Phys. A. 582. 401-439 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Asami: "Static properties of the nucleon in the Faddeev approach based on the Namub-Jona-Lasinio model" Phys. Rev. C. 51. 3388-3392 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A. Kohama: "Anomalous mass number dependence of nuclear transparency" Phys. Lett. B. 344. 61-66 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J. Hartmann: "Elimination of the Landau ghost from chiral solutions" Phys. Rev. C. 50. 3088-3093 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Yazaki: "QCD, hadrons and nuclei" World Scientific, 32 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Yazaki: "Nuclear transparency in high energy reactions" World Scientific, 10 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Sakai: "H-dibaryon in nuclear matter" Nucl.Phys.A594. 247-262 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] N.Ishii: "Baryons in the NJL model as solutions of the relativistic Faddeev equation" Nucl.Phys.A587. 617-656 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.Hejc: "EOS of nuclear matter at finite temperature and density in the 1/N expansion of the relativistic delta-omega model" Nucl.Phys.A582. 401-439 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Asami: "Static properties of the nucleon in the Faddeev approach based on the Nambu-Jona-Lasinio model" Phys.Rev.C51. 3388-3392

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Kohama: "Anomalous mass number dependence of nuclear transparency" Phys.Lett.B344. 61-66 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.Hartmann: "Elimination of the Landau ghost from chiral solutions" Phys.Rev.C50. 3088-3093 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Yazaki: QCD,hadrons and nuclei. World Scientific, 87-119 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Yazaki: Nuclear transparency in high energy reactions. World Scientific, 32-42 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 石井理修: "Baryons in the NJL model as solutions of the relativistic Feedeev equation" Nuclear Physics A. 587. 617-656 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小浜洋央: "Aromalous mass number dependence of nuclear transparency" Progress of Theoretical Physics Supplement. 120. 277-282 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 浅海弘保: "Static properties of the nucleon in the Faddeev cpproach bwed on the NJL model" Phys.Rev.C. 51. 3388-3392 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 石井理修: "Three quark Faddeev equation in the Nambu Jone-Lasinio model" Progress of Theoretical Physics Supplement. 120. 323-328 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 坂井任: "H.dibaryon in nuclear matter" Nuclear Physics A. 594. 247-262 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小浜洋央: "Nuclear transparency in a relativistic quark model" Australian Journal of Physics. (掲載予定).

    • Related Report
      1995 Annual Research Report
  • [Publications] 矢崎紘一: "V.E.Herscovits,C,A,Z,Vassoncillos,E.Ferreiric編集、World Scinetitic" Hadron physics 94-Topics on the structure and interactions of hadronic systems. 386 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 矢崎紘一,小浜洋央: "A model for nuclear transparency in high energy quasi-elastic scatterings" Nuclear Physics A. 575. 645-672 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 森松治,矢崎紘一: "A Green's functoon method for hadrons in nuclei" Progress in Particle and Nuclear Physics. 33. 679-728 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 小浜洋央,矢崎紘一,関亮一: "Anomalous mass number dependence of nuclear transparency" Physics Letters B. 344. 61-66 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 石井理修,ベンツ・ ヴォフガング,矢崎紘一: "Baryons in the NJL model as solutions of the relativistic Faddeev equation" Nuclear Physics A. (掲載予定).

    • Related Report
      1994 Annual Research Report
  • [Publications] 矢崎紘一,小浜洋央: "Hadrans and Nuclei from QCD(Proc.Int.School Seminar '93)" 藤井,赤石,Reznik編集,World Scientific, 390 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Kohama,A: "Nuclear transparency electron nucleus scattering" Nucl.Phys.A. 551. 687-707 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Ishii,N: "Faddeev approach to the nucleon in the Nambu-Jona-Lasiaio(NJL)model" Phys.Letters B. 201. 165-169 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2021-04-07  

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