The average phase factor e2iθ of the QCD determinant is evaluated at the finite quark chemical potential (μq) with the two-flavor version of the Polyakov-loop extended Nambu-Jona-Lasinio model with the scalar-type eight-quark interaction. For μq larger than half the pion mass mπ at vacuum, e2iθ is finite only when the Polyakov loop is larger than ∼0.5, indicating that lattice QCD is feasible only in the deconfinement phase. A critical end point lies in the region of e2iθ=0. The scalar-type eight-quark interaction makes it shorter a relative distance of the critical end point to the boundary of the region. For μq<mπ/2, the Polyakov-loop extended Nambu-Jona-Lasinio model with dynamical mesonic fluctuations can reproduce lattice QCD data below the critical temperature.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - Nov 10 2010|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)