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2005 Fiscal Year Final Research Report Summary

Study of chiral property of nuclear matter based on the dispersion of vector meson.

Research Project

Project/Area Number 15340089
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionRIKEN

Principal Investigator

EN'YO Hideto  RIKEN, Radiation Laboratory, Chief Scientist, 延與放射線研究室, 主任研究員 (30213606)

Co-Investigator(Kenkyū-buntansha) YOKKAICHI Satoshi  RIKEN, Radiation Laboratory, Contract Researcher, 延與放射線研究室, 協力研究員 (20360670)
MUTO Ryotaro  RIKEN, Radiation Laboratory, Special Postdoctoral Fellow, 延與放射線研究室, 基礎科学特別研究員 (50392147)
OHTANI Munehisa  RIKEN, Radiation Laboratory, Contract Researcher, 延與放射線研究室, 協力研究員 (70373280)
NARUKI Megumi  RIKEN, Radiation Laboratory, Special Postdoctoral Fellow, 延與放射線研究室, 基礎科学特別研究員 (00415259)
Project Period (FY) 2003 – 2005
Keywordsphi meson / chiral symmetry / nuclear matter / media effect / invariant mass / electron pair
Research Abstract

This research project is to complete the data analyses of the experiment KEK-PS-E325 which has been performed to search for the modification of spectral shape of vector mesons in nuclear matter, in 12 GeV proton-nuclear reactions. Such phenomena are theoretically predicted in term of partial restoration of chiral symmetry in nuclear media.
Through the present research project, we have completed the data analyses for all the data we have acquired, and have reported "Experimental signature of the medium modification for rho and omega mesons in 12-GeV p + A reactions" in Phys. Rev. Lett. with 100 times higher statistics and reconfirmed our previous publicafirst results.
We have also discovered the modification of phi meson for the first time, and the paper "First observation of in-medium modification of phi meson at normal nuclear density" was published in Phys. Rev. Lett.
We have also obtained the absolute production cross section for omega and phi mesons as functions of transverse momentum and rapidity, and the paper the paper "Nuclear mass number dependence of inclusive production of omega and phi mesons in 12-GeV p + A collisions" was published in Phys. Rev. C. This paper is not sensational, but very important to give the basis of our discoveries described above. We have also compared K+K-decays and e+e-decays of phi meson. This result reads to the discussion on the modification of decay branch in nuclear matter. The paper is was published in Phys. Rev. Lett.
All the goals of the present experiment have been reached, and we will summarize all our results in the full paper near future. We conclude that the present research project is successfully concluded with new and important discoveries.

  • Research Products

    (24 results)

All 2007 2006 2004 2003

All Journal Article (24 results)

  • [Journal Article] Nuclear-Matter Modification of Decay Widths in the φ^->e+e^-and φ^->K+K^- Channels2007

    • Author(s)
      F.Sakuma et al.
    • Journal Title

      Physical Review Letter 98

      Pages: 152302

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evidence for In-Medium Modification of the φ Meson at Normal Nuclear Density2007

    • Author(s)
      R.Muto et al.
    • Journal Title

      Physical Review Letter 98

      Pages: 042501

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Study of in-medium meson modification in 12-GeV p + A reactions2007

    • Author(s)
      S.Yokkaichi et al.
    • Journal Title

      Int. J. Mod. Physics A22

      Pages: 397

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Nuclear-Matter Modification of Decay Widths in the cp->e+e-and (p->K+K-Channels. F.2007

    • Author(s)
      F.Sakuma et al.
    • Journal Title

      Phys. Rev. Lett. 98

      Pages: 152302

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Evidence for In-Medium Modification of the cp Meson at Normal Nuclear Density.2007

    • Author(s)
      R.Muto et al.
    • Journal Title

      Phys. Rev. Lett. 98

      Pages: 042501

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Nuclear mass number dependence of inclusive production of omega and phi mesons in 12-GeV p + A collisions.2006

    • Author(s)
      T.Tabaru et al.
    • Journal Title

      Physical Review C74

      Pages: 025201

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Medium Modifcation on Vector Mesons Observed in 12 GeV p + A Reactions2006

    • Author(s)
      M.Naruki et al.
    • Journal Title

      AIP Conf. Proc. 870

      Pages: 503

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] First observation of phi-meson mass modification in nuclear medium2006

    • Author(s)
      R.Muto et al.
    • Journal Title

      Nuclear Physics A774

      Pages: 723

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Experimental signature of the medium modification for rho and omega mesons in 12-GeV p + A reactions.2006

    • Author(s)
      M.Naruki et al.
    • Journal Title

      Physical Review Letter 96

      Pages: 092301

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Nuclear mass number dependence of inclusive production of omega and phi mesons in 12-GeV p + A collisions2006

    • Author(s)
      T.Tabaru et al.
    • Journal Title

      Phys. Rev. C74

      Pages: 025201

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Experimental Signature of Medium Modifications for rho and omega Mesons in the 12 GeV p+A Reactions2006

    • Author(s)
      M.Naruki et al.
    • Journal Title

      Phys. Rev. Lett. 96

      Pages: 092301

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Study of in-medium meson modification in 12-GeV p + A reactions2006

    • Author(s)
      S.Yokkaichi et al.
    • Journal Title

      Proceedings of 9th International Workshop on Meson Production, Properties and Interaction, Int. J. Mod. Phys. (MESON 2006) Cracow, Poland A22.397(2007)

      Pages: 9-13

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Experimental Study of in-medium meson Experimental Study of in-medium meson modification at the KEK 12 GeV PS2006

    • Author(s)
      S.Yokkaichi et al.
    • Journal Title

      Proceedings of HFD06, YITP Workshop "Hadrons at finite density" Feb. 20-22, 2006, YITP, Kyoto University, Soryushiron Kenkyu (Kyoto), 114

      Pages: 7-12

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Medium Modification on Vector Mesons Observed in 12 GeV p + A Reactions2006

    • Author(s)
      M.Naruki et al.
    • Journal Title

      Proceedings of CIPANP2006, Conference on the Intersections of Particle and Nuclear Physics, AIP Conf. Proc. 870

      Pages: 503

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] First observation of phi-meson mass modification in nuclear medium.2006

    • Author(s)
      Muto et al.
    • Journal Title

      Proceedings of the QM 2005, 18th Int'l Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Nucl. Phys. A774

      Pages: 723

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Experimental signature of in-medium mass modification of vector mesons at normal nuclear density2004

    • Author(s)
      R.Muto et al.
    • Journal Title

      Journal of Physics G30

      Pages: S1023-1026

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of invariant mass spectra of vector meson decaying in nuclear matter at KEK-PS.2004

    • Author(s)
      R.Muto et al.
    • Journal Title

      AIP Conference Proceedings 698

      Pages: 138-141

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Spectrometer for measurements of Phi mesons in nuclear matter produced through 12-GeV p + A reactions.2004

    • Author(s)
      M.Sekimoto et al.
    • Journal Title

      Nuclear Instruments and Methods A516

      Pages: 390-405

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Spectrometer for measurements of phi mesons in nuclear matter produced through 12-gev p+a reactions2004

    • Author(s)
      M.Sekimoto et al.
    • Journal Title

      Nuclear Inst. and Methods A 516.2-3

      Pages: 390-405

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Experimental signature of in-medium mass modification of vector mesons at normal nuclear density2004

    • Author(s)
      R.Muto et al.
    • Journal Title

      Proceedings of the QM 2004, 17th Int'l Conference on Ultra-Relativistic Nucleus-Nucleus Collisions, Journal of Physics G 30

      Pages: 1023-1026

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Measurement of invariant mass spectra of vector meson decaying in nuclear matter.2003

    • Author(s)
      M.Naruki et al.
    • Journal Title

      Nuclear Physics A721

      Pages: 297-300

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Nuclear media effects on production and decay of vector meson studied in 12-GeV p + A interaction.2003

    • Author(s)
      H.Enyo et al.
    • Journal Title

      Progress of Theoretical Physics Supplements 149

      Pages: 49-55

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Measurement of Invariant Mass Spectra of Vector Meson Decaying in Nuclear Matter at KEK-PS2003

    • Author(s)
      R.Muto et al.
    • Journal Title

      Proceedings of the 8th Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2003), AIP Conf. Proc. 698

      Pages: 138-141

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Nuclear Media Effects on Production and Decay of Vector Meson Studied in 12 GeV p + A Interaction2003

    • Author(s)
      H.En'yo et al.
    • Journal Title

      proceedings of YITP-RCNP Workshop on "Chiral Restoration in Nuclear Medium" Prog. of Theo. Phys. Supp 149

      Pages: 49-55

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2008-05-27  

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