Nucleon mass and isovector couplings in 2+1-flavor dynamical domain-wall lattice QCD near physical mass
Nucleon mass and isovector couplings in 2+1-flavor dynamical domain-wall lattice QCD near physical mass
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物理质量附近 2 1-味动力学域壁晶格 QCD 中的核子质量和等矢量耦合
DOI：
10.1103/physrevd.101.034510
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发表时间：
2020
影响因子：
5
通讯作者：
Eigo Shintani
中科院分区：
文献类型：
--
作者：
Michael Abramczyk;Thomas Blum;Taku Izubuchi;Chulwoo Jung;Meifeng Lin;Andrew Lytle;Shigemi Ohta;Eigo Shintani
我们报告核子质量，矢量和轴向矢量电荷，张量和标量耦合，计算使用两个最近的味道动力学畴壁费米子晶格QCD合奏联合产生的RIKEN-BNL-哥伦比亚和UKQCD合作。这些系综是用Iwasakawa位置抑制行列式比规范作用在1.378（7）GeV的反晶格间距和249.4（3）和172.3（3）MeV的π介子质量值下产生的。核子质量外推到物理点上的一个值。等矢量矢量电荷重整为统一的手征极限，严格限制激发态污染的计算。等矢量轴向矢量与矢量电荷之比显示出约10%的赤字。张量耦合不再依赖于质量，并外推到1.04（5）在物理点的非重整化，与我们之前的计算和随后的其他计算中在最轻质量处获得的值非常一致。标量电荷，虽然噪音，不显示质量依赖性，并与其他计算一致。
We report nucleon mass, isovector vector and axial-vector charges, and tensor and scalar couplings, calculated using two recent-flavor dynamical domain-wall fermion lattice-QCD ensembles generated jointly by the RIKEN-BNL-Columbia and UKQCD Collaborations. These ensembles were generated with Iwasakidislocation-suppressing-determinant-ratio gauge action at an inverse lattice spacing of 1.378(7) GeV and pion mass values of 249.4(3) and 172.3(3) MeV. The nucleon mass extrapolates to a valueat the physical point. The isovector vector charge renormalizes to unity in the chiral limit, narrowly constraining excited-state contamination in the calculation. The ratio of the isovector axial-vector to the vector charges shows a deficit of about 10%. The tensor coupling no longer depends on mass and extrapolates to 1.04(5) inrenormalization at the physical point, in a good agreement with the value obtained at the lightest mass in our previous calculations and other calculations that followed. The scalar charge, though noisier, does not show mass dependence and is in agreement with other calculations.