Scalar-pseudoscalar meson behavior and restoration of symmetries in SU(3) Polyakov–Nambu–Jona-Lasinio model

P. Costa, M. C. Ruivo, C. A. de Sousa, H. Hansen, and W. M. Alberico
Phys. Rev. D 79, 116003 – Published 12 June 2009

Abstract

The modification of mesonic observables in a hot medium is analyzed as a tool to investigate the restoration of chiral and axial symmetries in the context of the Polyakov-loop extended Nambu–Jona-Lasinio model. The results of the extended model lead to the conclusion that the effects of the Polyakov loop are fundamental for reproducing lattice findings. In particular, the partial restoration of the chiral symmetry is faster in the Polyakov–Nambu–Jona-Lasinio model than in the Nambu–Jona-Lasinio one, and it is responsible for several effects: the meson-quark coupling constants show a remarkable difference in both models, there is a faster tendency to recover the Okubo-Zweig-Iizuka rule, and finally the topological susceptibility nicely reproduces the lattice results around T/Tc1.0.

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  • Received 16 July 2008

DOI:https://doi.org/10.1103/PhysRevD.79.116003

©2009 American Physical Society

Authors & Affiliations

P. Costa

  • Departamento de Física, Universidade de Coimbra, P-3004-516 Coimbra and E.S.T.G., Instituto Politécnico de Leiria, Morro do Lena-Alto do Vieiro, 2411-901 Leiria, Portugal

M. C. Ruivo and C. A. de Sousa

  • Departamento de Física, Universidade de Coimbra, P-3004-516 Coimbra, Portugal

H. Hansen

  • Univ. Lyon/UCBL, CNRS/IN2P3, IPNL “Labo en lutte,” 69622 Villeurbanne Cedex, France

W. M. Alberico

  • Dipartimento di Fisica Teorica, University of Torino and INFN, Sezione di Torino, via P. Giuria 1, I-10125 Torino, Italy

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Issue

Vol. 79, Iss. 11 — 1 June 2009

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