Nucleon scalar and tensor couplings from lattice QCD at the physical points
Nucleon scalar and tensor couplings from lattice QCD at the physical points
复制标题
物理点处晶格 QCD 的核子标量和张量耦合
DOI：
10.1051/epjconf/202227406009
复制
发表时间：
2022
影响因子：
--
通讯作者：
Yamazaki Takeshi
中科院分区：
文献类型：
--
作者：
Tsuji Ryutaro;Aoki Yasumichi;Ishikawa Ken-Ichi;Kuramashi Yoshinobu;Sasaki Shoichi;Shintani Eigo;Yamazaki Takeshi
本文给出了由2+ 1味QCD得到的核子与物理轻夸克质量（M π= 135 MeV）的轴向、标量和张量等矢耦合（g A，g S和g T）的结果.我们的计算是在一个单一的晶格间距为0.085 fm，但有两个大的体积（10.9 fm）4和（5.5 fm）4。这些组态是由PACS协作组用非微扰O（a）改进的Wilson夸克作用量和Iwasaki规范作用量产生的。g A的结果是测定g S和gT的准确度和精密度的良好指标。我们的g A的结果很好地再现了实验值的统计误差小于2%。对于g S和g T，我们通过RI/S（γμ）中间方案计算了MS方案中2GeV尺度下的重整化常数，得到g S= 0.927（83）stat（22）syst和g T= 1.036（6）stat（20）syst
We present results for the axial, scalar and tensor isovector-couplings (g A, g S and g T) of the nucleon obtained from 2+ 1 flavor QCD with the physical light quark masses (M π= 135 MeV). Our calculations are performed at a single lattice spacing of 0.085 fm, but with two large volumes of (10.9 fm) 4 and (5.5 fm) 4. The configurations are generated by the PACS Collaboration with nonperturbatively O (a) improved Wilson quark action and Iwasaki gauge action. The result of g A is a good indicator for determination of g S and gT with respect to accuracy and precision. Our result of g A well reproduces the experimental value within a statistical error of less than 2%. As for g S and g T, we compute the renormalization constants at the scale of 2 GeV in the MS scheme through the RI/SMOM (γµ) intermediate scheme, and then obtain g S= 0.927 (83) stat (22) syst and g T= 1.036 (6) stat (20) syst