Gluonic Pole Matrix Elements and Universality

Details Gluonic Pole Matrix Elements and Universality Gluonic Pole Matrix Elements and Universality

2008-12-23

arxiv.org/abs/0812.4412v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6pages, 2 figures: To appear in the Proceedings of DIFFRACTION 2008, International Workshop on Diffraction in High-Energy Phys

Scientific paper

10.1063/1.3122209

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.

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