标题： 构成夸克在QCD中如何出现？ 微扰理论和红外线 显示英文标题

标题： How do constituent quarks arise in QCD? Perturbation theory and the infra-red

摘要： 我们通过论证说明使用裸电荷的必要性，例如，这些对象用于描述构成夸克以及规范理论中的物理带电态。 我们对QED和QCD中的修饰进行了简要介绍。 我们特别强调了运动修饰电荷的红外性质。 更准确地说，我们证明了相对论修饰电荷的一环传播子可以在质量壳方案中进行重整化，不会出现红外发散。 显示英文摘要

摘要： We motivate the use of dressed charges by arguing that such objects are needed to describe, e.g., constituent quarks and, in general, physical charged states in gauge theories. We give a short introduction to dressings in both QED and QCD. We put special emphasis on the infra-red properties of a moving dressed charge. To be more precise, we demonstrate that the one loop propagator of a relativistic dressed charge can be renormalized in the mass shell scheme with no infra-red divergence showing up.