TY - JOUR

T1 - Average phase factor in the Polyakov-loop extended Nambu-Jona-Lasinio model

AU - Sakai, Yuji

AU - Sasaki, Takahiro

AU - Kouno, Hiroaki

AU - Yahiro, Masanobu

N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2010/11/10

Y1 - 2010/11/10

N2 - 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 μqπ/2, the Polyakov-loop extended Nambu-Jona-Lasinio model with dynamical mesonic fluctuations can reproduce lattice QCD data below the critical temperature.

AB - 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 μqπ/2, the Polyakov-loop extended Nambu-Jona-Lasinio model with dynamical mesonic fluctuations can reproduce lattice QCD data below the critical temperature.

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U2 - 10.1103/PhysRevD.82.096007

DO - 10.1103/PhysRevD.82.096007

M3 - Article

AN - SCOPUS:78651076132

SN - 1550-7998

VL - 82

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 9

M1 - 096007

ER -