论文标题
轴向U（1）在高温下用晶格手性费米子进行研究
Study of the axial U(1) anomaly at high temperature with lattice chiral fermions
论文作者
论文摘要
我们研究温度190--330 MeV时两种培养物QCD的轴向U（1）异常。为了在晶格上保留精确的手性对称性，我们采用了Mobius域壁壁操作，以及通过随机重新加权技术实施的重叠费用动作。与以前的研究相比，我们将晶格间距降低到0.07 FM，模拟较大的多卷以估计有限尺寸效应，并采用四个以上的夸克质量点，其中包括一个低于物理点的一个以研究手性极限。我们测量了拓扑敏感性，轴向U（1）敏感性，并检查了介子和baryon相关因子中u（1）伴侣的退化性。临界温度上方的所有数据表明，轴向U（1）违规与统计误差内的零一致。夸克质量依赖性表明U（1）异常的消失，速率与SU（2）_l X SU（2）_R对称性破裂相当。
We investigate the axial U(1) anomaly of two-flavor QCD at temperatures 190--330 MeV. In order to preserve precise chiral symmetry on the lattice, we employ the Mobius domain-wall fermion action as well as overlap fermion action implemented with a stochastic reweighting technique. Compared to our previous studies, we reduce the lattice spacing to 0.07 fm, simulate larger multiple volumes to estimate finite size effect, and take more than four quark mass points, including one below physical point to investigate the chiral limit. We measure the topological susceptibility, axial U(1) susceptibility, and examine the degeneracy of U(1) partners in meson and baryon correlators. All the data above the critical temperature indicate that the axial U(1) violation is consistent with zero within statistical errors. The quark mass dependence suggests disappearance of the U(1) anomaly at a rate comparable to that of the SU(2)_L x SU(2)_R symmetry breaking.
