The Construction of Gauge-Links in Arbitrary Hard Processes
High Energy Physics - Phenomenology
2009-01-07 v1
Abstract
Transverse momentum dependent parton distribution and fragmentation functions are described by hadronic matrix elements of bilocal products of field operators off the light-cone. These bilocal products contain gauge-links, as required by gauge-invariance. The gauge-links are path-ordered exponentials connecting the field operators along a certain integration path. This integration path is process-dependent, depending specifically on the short-distance partonic subprocess. In this paper we present the technical details needed in the calculation of the gauge-links and a calculational scheme is provided to obtain the gauge-invariant distribution and fragmentation correlators corresponding to a given partonic subprocess.
Keywords
Cite
@article{arxiv.hep-ph/0601171,
title = {The Construction of Gauge-Links in Arbitrary Hard Processes},
author = {C. J. Bomhof and P. J. Mulders and F. Pijlman},
journal= {arXiv preprint arXiv:hep-ph/0601171},
year = {2009}
}