Color Gauge Invariance in Hard Processes
arXiv:hep-ph/0409332 · doi:10.1007/s00601-004-0105-8
Abstract
Within the theoretical framework we apply, a suggested origin for single spin asymmetries is the presence of gauge links in transverse momentum dependent distribution functions. Recently we found new gauge link structures in a number of hard processes. These structures need to be considered in the evolution of parton distribution functions and for establishing factorization.
One reference corrected, 4 pages and 2 figures. Presented at Light-Cone 2004