Gauge-Invariant Gluon TMD and Evolution in the Coordinate Space

Abstract

Maximally path-dependent gauge-invariant operator definition of the gluon transverse-momentum dependent pdf (gTMD) is discussed. It is argued that the evolution equations for the gTMD in the coordinate representation can be derived from the equations of motion in the generalised loop space, whose elements are the hadronic averages of the Wilson loops of entirely arbitrary shape.

Comments: 7 pages. Presented at the QCD Evolution Workshop, 26 - 30 May 2015, Jefferson Lab, Newport News (VA), USA