Speaker
Description
Two gluon TMDs with different Wilson line configurations have been studied intensively at small-x: the Weizsacker-Williams type and the dipole type. They have different transverse momentum dependences and thus they will correspond to two different integrated gluon distributions. However, these two distributions have exactly the same expressions in light-cone gauge. In this talk, I will discuss the subtlety when using axial gauge (light-cone gauge is one kind of axial gauge) to study correlation functions of non-Abelian field strengths dressed with Wilson lines of infinite extent. I will explain the breakdown of naive axial gauge by showing an explicit example of perturbative calculations and discussing the issue from a path integral perspective. I will also illuminate under what conditions naive application of axial gauge will lead to unreliable results.
