Axial U(1) symmetry at finite temperature with M\"obius domain-wall fermions
Axial U(1) symmetry at finite temperature with M\"obius domain-wall fermions
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有限温度下M"obius域壁费米子的轴向U(1)对称性
DOI：
10.22323/1.214.0210
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Tomiya
中科院分区：
文献类型：
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作者：
Jlqcd collaboration Guido Cossu;H. Fukaya;S. Hashimoto;T. Kaneko;J. Noaki;A. Tomiya
研究了有限温度下双味QCD的轴向U(1)对称恢复。我们采用M\ ' obius域壁形式，旨在实现良好的手性对称性。我们展示了对U(1)_A对称破缺敏感的介子磁化率差异的测量。信号以零和近零模式为主。通过对重叠费米子的测量重新加权，我们发现在手性转变温度以上，U(1)_A断裂效应受到抑制。
We investigate the axial $U(1)$ symmetry restoration at finite temperature in two flavor QCD. We employ the M\"obius domain-wall formalism that is designed to achieve good chiral symmetry. We show the measurements of a difference of meson susceptibilities, sensitive to the $U(1)_A$ symmetry breaking. The signal is dominated by zero and near-zero modes. By reweighting the measure to that of overlap fermions we find a suppression of the $U(1)_A$ breaking effects above the chiral transition temperature.