Gluonic Pole Matrix Elements and Universality
arXiv:0812.4412 · doi:10.1063/1.3122209
Abstract
We investigate the spectral properties of quark-quark-gluon correlators and use this to study gluonic pole matrix elements. Such matrix elements appear in principle both for distribution functions such as the Sivers function and fragmentation functions such as the Collins function. We find that for a large class of spectator models, the contribution of the gluonic pole matrix element for fragmentation functions vanishes. This result is important in the study of universality for fragmentation functions.
6pages, 2 figures: To appear in the Proceedings of DIFFRACTION 2008, International Workshop on Diffraction in High-Energy Physics, La Londe-les-Maures, France, 9-14 Sept 2008