Effective models of two-flavor QCD: From small towards large m{sub q}

Journal Article · Tue Dec 01 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.114022· OSTI ID:21313477

Kaehaerae, T; Tuominen, K ^[1]

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1. Department of Physics, University of Jyvaeskylae, P.O. Box 35, FIN-40014 Jyvaeskylae (Finland) and Helsinki Institute of Physics, P.O. Box 64, FIN-00014 University of Helsinki (Finland)

We study effective models of chiral fields and Polyakov loop expected to describe the dynamics responsible for the phase structure of two-flavor QCD. We consider the chiral sector described either using a linear sigma model or a Nambu-Jona-Lasinio model and study how these models, on the mean-field level when coupled with the Polyakov loop, behave as a function of increasing bare quark (or pion) mass. We find qualitatively similar behaviors for the cases of the linear sigma model and the Nambu-Jona-Lasinio model and, by comparing with existing lattice data, show that one cannot conclusively decide which of the two approximate symmetries drives the phase transitions at the physical point.

• OSTI ID: 21313477
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
APPROXIMATIONS
CHIRALITY
FLAVOR MODEL
MASS
MEAN-FIELD THEORY
PHASE TRANSFORMATIONS
PIONS
QUANTUM CHROMODYNAMICS
QUARKS
SIGMA MODEL
SYMMETRY