真空极化函数的晶格研究及强耦合常数的确定
Lattice study of vacuum polarization function and determination of strong coupling constant
摘要：
我们利用重叠费米子公式计算了晶格上的真空极化函数，通过匹配大动量尺度下的晶格数据和微扰展开（OPE），得到了双味QCD中的强耦合常数$α_s(μ)$：$Λ^{(2)}_{\overline{MS}}$ = $0.234(9)(^{+16}_{- 0})$ GeV，其中的误差分别是统计的和系统的.另外，通过分析矢量通道和轴矢量通道的不同，我们得到了一些四夸克凝聚。
英文摘要：
We calculate the vacuum polarization functions on the lattice using the overlap fermion formulation.By matching the lattice data at large momentum scales with the perturbative expansion supplemented by Operator Product Expansion (OPE), we extract the strong coupling constant $α_s(μ)$ in two-flavor QCD as $Λ^{(2)}_{\overline{MS}}$ = $0.234(9)(^{+16}_{- 0})$ GeV, where the errors are statistical and systematic, respectively. In addition, from the analysis of the difference between the vector and axial-vector channels, we obtain some of the four-quark condensates.
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