https://doi.org/10.1140/epja/i2002-10309-0
On the chiral phase transition in the linear sigma model
1
Vietnam Atomic Energy Commission, 59 Ly Thuong Kiet, Hanoi, Vietnam
2
Institute for Nuclear Science and Technique, P.O. Box 5T-160, Hoang Quoc Viet, Hanoi
3
Department of Physics, Hanoi University of Education II, Hanoi, Vietnam
* e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
The Cornwall-Jackiw-Tomboulis (CJT) effective action for composite operators at finite temperature is used to investigate the chiral phase transition within the framework of the linear sigma model as the low-energy effective model of quantum chromodynamics (QCD). A new renormalization prescription for the CJT effective action in the Hartree-Fock (HF) approximation is proposed. A numerical study, which incorporates both thermal and quantum effect, shows that in this approximation the phase transition is of first order. However, taking into account the higher-loop diagrams contribution the order of phase transition is unchanged.
© Società Italiana di Fisica and Springer-Verlag, 2004
