Axial U(1) symmetry and mesonic correlators at high temperature in $N_f=2$ lattice QCD

Kei Suzuki, S. Aoki, Y. Aoki, G. Cossu, H. Fukaya, S. Hashimoto, C. Rohrhofer
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引用次数: 8

Abstract

We investigate the high-temperature phase of QCD using lattice QCD simulations with $N_f = 2$ dynamical Mobius domain-wall fermions. On generated configurations, we study the axial $U(1)$ symmetry, overlap-Dirac spectra, screening masses from mesonic correlators, and topological susceptibility. We find that some of the observables are quite sensitive to lattice artifacts due to a small violation of the chiral symmetry. For those observables, we reweight the Mobius domain-wall fermion determinant by that of the overlap fermion. We also check the volume dependence of observables. Our data near the chiral limit indicates a strong suppression of the axial $U(1)$ anomaly at temperatures $\geq$ 220 MeV.
N_f=2晶格QCD高温下的轴向U(1)对称性和介子相关子
我们利用$N_f = 2$动态莫比乌斯畴壁费米子进行晶格QCD模拟,研究了QCD的高温相。在生成的构型上,我们研究了轴向$U(1)$对称性、重叠狄拉克谱、从介子相关器筛选质量和拓扑磁化率。我们发现,由于手性对称性的轻微破坏,一些可观测值对晶格伪影非常敏感。对于这些可观测值,我们将莫比乌斯畴壁费米子的行列式重新加权为重叠费米子的行列式。我们还检查了可观测值的体积依赖性。我们在接近手性极限的数据表明,在$\geq$ 220 MeV温度下,轴向$U(1)$异常受到强烈抑制。
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