Hidden Local Field Theory and Dileptons in Relativistic Heavy Ion Collisions(Nuclear Physics)

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概要

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• The notion of "hadronic freedom" is introduced based on the vector manifestation of hidden local symmetry and is used to suggest that the dileptons measured in relativistic heavy-ion collisions do not provide direct information on the spontaneous breaking of chiral symmetry and hence on the mechanism for mass generation of light-quark hadrons. We give arguments how the dileptons emitted from those vector mesons whose masses are shifted a la Brown-Rho (BR) scaling by the vacuum change in temperature- as in heavy-ion collisions- and/or density- as in cold compressed matter-could be strongly suppressed in the hadronic free region between the chiral restoration point and the "flash point" at which the vector mesons recover ≳90% of their free-space on-shell masses and the full strong coupling strength. It may seem ironical that the very mechanism i.e., the vector manifestation in hidden local symmetry, that is to make the mass drop and modify the spectral function is in turn responsible for the dilepton suppression. A possible falsification of this drastic prediction will be indicated. We also briefly discuss the potential role played by the holographic dimension intrinsic in gravity-gauge duality that provides a unified field theory description of hadrons- both mesons and baryons- under extreme conditions. Baryons arise as coherent states of pions and vector mesons of holographic QCD which define the ground state or the "vacuum" on which mesonic excitations could undergo BR scaling.

• 理論物理学刊行会の論文
• 2009-06-25

著者

• Harada Masayasu

  Department of Physics, Nagoya University

• Sasaki Chihiro

  Physik-Department, Technische Universitat Munchen

• Holt Jeremy

  Physik Department Technische Universitat Munchen

• Sasaki Chihiro

  Technische Univ. Muenchen Garching Deu

• Harada Masayasu

  Nagoya Univ. Nagoya Jpn

• Harada Masayasu

  Department Of Physics Kyoto University

• Sasaki Chihiro

  Physik Department Technische Universitat Munchen

• Rho Mannque

  Institut De Physique Theorique Cea:department Of Physics Hanyang University

• BROWN Gerald

  Department of Physics and Astronomy, State University of New York

• Brown Gerald

  Department Of Physics And Astronomy State University Of New York

• SASAKI Chihiro

  Physik Department, Technische Universitat Munchen

• RHO Mannque

  Institut de Physique Theorique, CEA:Department of Physics, Hanyang University

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