论文标题

手性对称QCD中的狄拉克特征值和轴向异常

Correlated Dirac Eigenvalues and Axial Anomaly in Chiral Symmetric QCD

论文作者

Ding, H. -T., Li, S. -T., Mukherjee, Swagato, Tomiya, A., Wang, X. -D., Zhang, Y.

论文摘要

我们介绍了衍生物[$ \ partial^{n}ρ(λ,m_ {l})/\ dirac特征频谱的dirac eigenvalue spectrum [$λ,m_ {l})$的dirac eigenvalue spectrum [$ m_ {l})$($ m_ quark quark y+l} $($ m__} $(l} $ l}的dirac eigenvalue spectrum [$ρ(λ,m_ {l})$(无质量狄拉克操作员的特征值($λ$)。使用这些关系,我们提出了$ \ partial^{n}ρ(λ,m_ {l})/\ partial m_ {l}^n $($ n = 1,2,3 $)的晶格QCD结果。使用(2+1)高度改进的交错夸克的口味进行计算,具有奇怪的夸克质量的物理价值,三个晶格间距$ a = 0.12、0.08、0.06 $ fm,并且长宽比$ 4-9 $进行。我们发现$ρ(λ\ to0,m_ {l})$开发了峰值结构。由于dirac特征值频谱的红外部分中的非稀释剂相关性而产生的峰值结构变得更加敏锐,并且其幅度与$ m_ {l}^2 $成正比。我们证明,此$ρ(λ\ to0,m_l)$是轴向异常在光标量和伪cal的两点相关函数中的表现。连续和手性外推后,我们发现轴向异常表现为标量和伪级介子的两点相关函数,在手性极限下。

We introduce novel relations between the derivatives [$\partial^{n}ρ(λ, m_{l})/\partial m_{l}^n$] of the Dirac eigenvalue spectrum [$ρ(λ, m_{l})$] with respect to the light sea quark mass ($m_{l}$) and the $(n+1)$-point correlations among the eigenvalues ($λ$) of the massless Dirac operator. Using these relations we present lattice QCD results for $\partial^{n}ρ(λ, m_{l})/\partial m_{l}^n$ ($n=1, 2, 3$) for $m_{l}$ corresponding to pion masses $m_π=160-55$ MeV, and at a temperature of about 1.6 times the chiral phase transition temperature. Calculations were carried out using (2+1) flavors of highly improved staggered quarks with the physical value of strange quark mass, three lattice spacings $a=0.12, 0.08, 0.06$ fm, and lattices having aspect ratios $4-9$. We find that $ρ(λ\to0, m_{l})$ develops a peaked structure. This peaked structure arises due to non-Poisson correlations within the infrared part of the Dirac eigenvalue spectrum, becomes sharper as $a\to0$, and its amplitude is proportional to $m_{l}^2$. We demonstrate that this $ρ(λ\to0,m_l)$ is responsible for the manifestations of axial anomaly in two-point correlation functions of light scalar and pseudoscalar mesons. After continuum and chiral extrapolations we find that axial anomaly remains manifested in two-point correlation functions of scalar and pseudoscalar mesons in the chiral limit.

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