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Research on the quark-gluon plasma and its probes

Research Project

Project/Area Number 09640350
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionThe University of Tokyo (1999)
Kyoto University (1997-1998)

Principal Investigator

MATSUI Tetsuo  The University of Tokyo, Graduate School of Arts and Sciences, Professor, 大学院・総合文化研究科, 教授 (00252528)

Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥1,100,000 (Direct Cost: ¥1,100,000)
Keywordsquark-gluon plasma / ultra-relativistic nucleus-nucleus / chiral phase transition / J / ψ suppression / カイラル相転移 / Ψ抑圧 / クォーク・グルオン・プラズマ / 相対論的重イオン反応
Research Abstract

Research was conducted on signals of the quark-gluon plasma formation in ultrarelativistic nucleus-nucleus collision, focusing on the dynamical process of the chiral phase transition and J/ ψ suppression by the onset of Debye screening in the plasma.
As a quark-gluon plasma cools down, a phase transition is expected to occur associated with spontaneous break-down of the (approximate) chiral symmetry. We studied the dynamics of the order parameter of this phase transition using the linear sigma model, an effective theory of QCD. We adopted the framework of the functional Schrodinger equation with variational ansatz for the wave-functional. We generalized the classical plane-wave solutions of the non-linear sigma model (the Anselm-Ryskin solutions) to include the effect of the quantum fluctuations by the method. We formulated a mean-field theory of the interacting quantum meson fields based on the Hatree-Bogoliubov method in the many-body problem and showed that our non-covariant functional Schrodinger equations can be transformed to a manifestly covariant form of Klein-Gordon type equations. Our solutions of collective isospin rotating modes of interacting meson fields was also extended to finite temperature using the Gaussian density matrices and the damping time of the modes was estimated by the linear response theory.
The problem of J/ ψ suppression as a signal of the quark-gluon plasma was studied focusing on the interplay of a coherent effect such as the plasma screening of the binding potential of heavy quark and its antiparticle and an incoherent effect such as the scattering with individual plasma

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] D. Vantherin, T. Matsui: "Quantum generalization of the classical rotating solution of the O(N) model"Physics Letters B. 437. 137-145 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Matsui: "Quark Matter '97: theoretical overview"Nuclear Physics A. 638. 19c-33c (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsue, D. Vantherin, T. Matsui: "Mean Field Theory for Collective Motion of Quantum Meson Fields"Progress of Theoretical Physics. 102. 313-332 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsue, D. Vantherin, T. Matsui: "Lifetime of Collective isospin rotation of a quantum meson field"Physical Review D. (in press). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] D. Vautherin, T. Matsui: "Quantum generalization of the classical rotating solution of the O(N) model"Phys. Letts. B. 437. 137-145 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Matsui: "Quark Matter '97 : theoretical overview"Nucl. Phys. A. 638. 19c-33c (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsue, D. Vautherin, T. Matsui: "Mean Field Theory for Collective Motion of Quantum Meson Fields"Prog. Theor. Phys.. 102. 313-332 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsue, D. Vautherin, T. Matsui: "Lifetime of collective isospin rotation of a quantum meson fields"Phys. Rey. D. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tsue, D. Vautherin and T. Matsui: "Mean Field Theory for Collective Motion of Quantum Meson Fields"Prog. Theor. Phys.. 102. 313-332 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y. Tsue, D. Vautherin and T. Matsui: "Lifetime of collective isospin rotations of a quantum meson field"Phys. Rev. D. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Matsui: "Quark Matter '97:theoretical overview" Nucl.Phys.A638. 19c-33c (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] D.Vautherin and T.Matsui: "Quantum generalization of the classical rotating solutions of the O(N)model" Phys.Lett.B437. 173-145 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] D.Vantherin and T.Matsui: "Boost-Invainant quantum eliolntion of a mison field at large prosen times" Physical Review D. 55. 4492- (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.S.Roh and T.Matsui: "Chiral Piase transition at Finite Temperature in the Cirear Sigma Model" Evropian Physies Journal A. 1. 205-220 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Matsui: "Quank Matter '97:theretical overview." Nuclean Pingsics A. (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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