论文标题
使用手性费米子从晶格QCD中的核子等异位张量电荷
The nucleon isovector tensor charge from lattice QCD using chiral fermions
论文作者
论文摘要
在这项工作中，我们介绍了使用$ n_f = 2+1 $ tomain-wall配置从晶格QCD模拟中提取的核子张量电荷的等异源味组合。使用六个价值夸克质量研究了pion质量依赖性，每个夸克质量在147至330 meV之间繁殖了价质量质量的值。我们通过使用几个值的源 - 链接分离值来调查并消除由于激发态污染而导致的系统不确定性，该值从1 FM到1.6 FM。我们使用二次和对数项在价部门中应用手性外推，以适合pion质量依赖性，这很好地描述了晶格数据。晶格矩阵元素是非扰动的重归于的，最终结果为$ g_t = 1.096（30）$在$ \ overline {\ rm MS} $方案中，以2 GEV的恢复量表为单位。
In this work we present the isovector flavor combination for the nucleon tensor charge extracted from lattice QCD simulations using overlap fermions on $N_f=2+1$ domain-wall configurations. The pion mass dependence is studied using six valence quark masses, each reproducing a value for the pion mass in the valence sector between 147 and 330 MeV. We investigate and eliminate systematic uncertainties due to contamination by excited states, by employing several values for the source-sink separation that span from 1 fm to 1.6 fm. We apply a chiral extrapolation in the valence sector using a quadratic and a logarithmic term to fit the pion mass dependence, which describes well the lattice data. The lattice matrix element is renormalized non-perturbatively, and the final result is $g_T=1.096(30)$ in the $\overline{\rm MS}$ scheme at a renormalization scale of 2 GeV.
