Final state interactions and gauge invariant parton distributions
Abstract
Parton distributions contain factorizable final state interaction effects originating from the fast-moving struck quark interacting with the target spectators in deeply inelastic scattering. We show that these interactions give rise to gauge invariance of the transverse momentum-dependent parton distributions. As compared to previous analyses, our study demonstrates the existence of extra scaling contributions from transverse components of the gauge potential at the light-cone infinity. They form a transverse gauge link which is indispensable for restoration of the gauge invariance of parton distributions in the light-cone gauge where the gauge potential does not vanish asymptotically. Our finding helps to explain a number of features observed in a model calculation of structure functions in the light-cone gauge.
Cite
@article{arxiv.hep-ph/0208038,
title = {Final state interactions and gauge invariant parton distributions},
author = {A. V. Belitsky and X. Ji and F. Yuan},
journal= {arXiv preprint arXiv:hep-ph/0208038},
year = {2010}
}
Comments
34 pages, LaTeX, 10 figures