The Schwinger–Dyson quark equation (SDE) combined with results from lattice simulation for the propagators are used to obtain information on the quark-gluon vertex, taking into account the recent full QCD lattice results for the soft-gluon limit. Its inclusion leads to a clear enhancement of the infrared quark-gluon vertex. We also find that the relative contribution of the quark-ghost kernel to the quark-gluon vertex in the infrared region does not follow the rules from the perturbative analysis of the ultraviolet region. This shows that for QCD the intuition based on perturbation theory does not apply to the full momentum range. The framework developed in the current work provides analytical expressions for all the longitudinal components of vertex taken into account.

中文翻译：

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夸克-胶子顶点的软胶子极限和红外增强

考虑到最近对于软胶子极限的完整QCD晶格结果，使用Schwinger-Dyson夸克方程（SDE）与晶格模拟结果对传播子的组合来获得有关夸克-胶子顶点的信息。它的包含导致红外夸克-胶子顶点的明显增强。我们还发现，夸克-鬼核对红外区域中的夸克-胶子顶点的相对贡献不遵循紫外区域的扰动分析法则。这表明对于QCD，基于扰动理论的直觉不适用于整个动量范围。当前工作中开发的框架提供了考虑到的所有顶点纵向分量的解析表达式。