Determination of U (1) A restoration from pion and a0 -meson screening masses: Toward the chiral regime

Masahiro Ishii, Koji Yonemura, Junichi Takahashi, Hiroaki Kouno, Masanobu Yahiro

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We incorporate the effective restoration of U(1)A symmetry in the 2+1-flavor entanglement Polyakov-loop extended Nambu-Jona-Lasinio (EPNJL) model by introducing a temperature-dependent strength K(T) to the Kobayashi-Maskawa-'t Hooft determinant interaction. T dependence of K(T) is well determined from pion and a0-meson screening masses obtained by lattice QCD (LQCD) simulations with improved p4 staggered fermions. The strength is strongly suppressed in the vicinity of the pseudocritical temperature of chiral transition. The EPNJL model with the K(T) well reproduces meson susceptibilities calculated by LQCD with domain-wall fermions. The model shows that the chiral transition is second order at the "light-quark chiral-limit" point where the light quark mass is zero and the strange quark mass is fixed at the physical value. This indicates that there exists a tricritical point. Hence, the location is estimated.

Original languageEnglish
Article number016002
JournalPhysical Review D
Volume93
Issue number1
DOIs
Publication statusPublished - Jan 7 2016

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restoration
pions
screening
mesons
quarks
quantum chromodynamics
fermions
determinants
domain wall
magnetic permeability
temperature
symmetry
simulation
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Determination of U (1) A restoration from pion and a0 -meson screening masses : Toward the chiral regime. / Ishii, Masahiro; Yonemura, Koji; Takahashi, Junichi; Kouno, Hiroaki; Yahiro, Masanobu.

In: Physical Review D, Vol. 93, No. 1, 016002, 07.01.2016.

Research output: Contribution to journalArticle

Ishii, Masahiro ; Yonemura, Koji ; Takahashi, Junichi ; Kouno, Hiroaki ; Yahiro, Masanobu. / Determination of U (1) A restoration from pion and a0 -meson screening masses : Toward the chiral regime. In: Physical Review D. 2016 ; Vol. 93, No. 1.
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