A Mean Field Approach To The Instanton-Induced Effect Close To The QCD Phase Transition

Details A Mean Field Approach To The Instanton-Induced Effect Close To The QCD Phase Transition A Mean Field Approach To The Instanton-Induced Effect Close To The QCD Phase Transition

1996-03-06

arxiv.org/abs/hep-ph/9603234v1

Phys.Rev. D56 (1997) 2766-2777

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, LaTeX, 6 postscript files of 6 figures in addition

Scientific paper

10.1103/PhysRevD.56.2766

In the instanton models the chiral phase transition is driven by a transition from random instanton-antiinstanton liquid and correlated instanton-antiinstanton molecules. So far this phenomenon was studied by numerical simulations, while we develop alternative semi-analytic approach. For two massless quark flavors, both instantons and ``molecules" generate specific 4-fermion effective interactions. After those are derived, we determine the temperature dependence of the thermodynamic quantities, the quark condensate and the fraction of molecules using standard mean field method. Using Bethe-Salpeter equation, we calculate T-dependence of mesonic correlation functions.

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