# 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

10 被引用数 (Scopus)

## 抄録

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.

本文言語 英語 016002 Physical Review D 93 1 https://doi.org/10.1103/PhysRevD.93.016002 出版済み - 1 7 2016

## All Science Journal Classification (ASJC) codes

• 物理学および天文学（その他）

## フィンガープリント

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