arXiv 1606.070752016-06hep-phhep-latnucl-th

核子在物理点处的奇异夸克磁矩

Strange Quark Magnetic Moment of the Nucleon at Physical Point

Raza Sabbir Sufian, Yi-Bo Yang, Andrei Alexandru, Terrence Draper, Keh-Fei Liu, Jian Liang

备注：: Published version in Physical Review Letters
发表信息：: Phys. Rev. Lett. 118, 042001 (2017)
DOI：: 10.1103/PhysRevLett.118.042001

摘要：

本文用格点量子色动力学方法计算了奇异夸克对核子磁矩和电荷半径的贡献。这个分析提出了第一个直接确定奇怪的电磁形状因子，包括在物理π介子质量。我们执行一个独立于模型的提取奇怪的磁矩和奇怪的电荷半径从电磁形状因子的动量转移范围内的$0.051 \,\text{GeV}^2 \lesssim Q^2 \lesssim 1.31 \,\text{GeV}^2 $。有限的晶格间距和有限的体积修正包括在一个全球性的适合与$24$价夸克质量的四个晶格具有不同的晶格间距，不同的体积，和四个海夸克质量，包括一个在物理π质量。我们得到了奇异的磁矩$G^s_M(0) = - 0.064(14)(09)\, μ_N$。四西格玛的统计精度的实现部分是由于夸克环的低模平均和低模替代，以改善核子传播子的统计。我们还得到了奇异电荷半径$\langle r_s^2\rangle_E = -0.0043 (16)(14)\,$ $\text{fm}^2$ .

英文摘要：

We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of $0.051 \,\text{GeV}^2 \lesssim Q^2 \lesssim 1.31 \,\text{GeV}^2 $. The finite lattice spacing and finite volume corrections are included in a global fit with $24$ valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment $G^s_M(0) = - 0.064(14)(09)\, μ_N$. The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius $\langle r_s^2\rangle_E = -0.0043 (16)(14)\,$ $\text{fm}^2$.

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