Testing the strength of the UA(1) anomaly at the chiral phase transition in two-flavour QCD

B. Brandt, M. Cè, A. Francis, T. Harris, H. Meyer, O. Philipsen, H. Wittig
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引用次数: 11

Abstract

We study the thermal transition of QCD with two degenerate light flavours by lattice simulations using $\mathcal{O}(a)$-improved Wilson quarks. Particular emphasis lies on the pattern of chiral symmetry restoration, which we probe via the static screening correlators. On $32^3$ volumes we observe that the screening masses in transverse iso-vector vector and axial-vector channels become degenerate at the transition temperature. The splitting between the screening masses in iso-vector scalar and pseudoscalar channels is strongly reduced compared to the splitting at zero temperature and is actually consistent with zero within uncertainties. In this proceedings article we extend our studies to matrix elements and iso-singlet correlation functions. Furthermore, we present results on larger volumes, including first results at the physical pion mass.
测试双味QCD手性相变中UA(1)异常的强度
利用$\mathcal{O}(a)$改进的Wilson夸克,通过点阵模拟研究了具有两种简并光味的QCD的热跃迁。特别强调的是手性对称恢复的模式,我们通过静态筛选相关器来探测。在$32^3$的体积上,我们观察到横向等矢量和轴矢量通道中的筛分质量在转变温度下变得简并。等矢量标量通道和伪标量通道中筛分质量的分裂比零温度下的分裂明显减小,并且在不确定度范围内与零基本一致。在这篇论文中,我们扩展了对矩阵元素和等单重态相关函数的研究。此外,我们提出了更大体积的结果,包括物理介子质量的第一个结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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