arXiv:hep-ph/0507281·v1·High Energy Physics — Phenomenology
A toy model for generalised parton distributions
J.R. Cudell🇧🇪 · F. Bissey🇳🇿 · J. Cugnon🇧🇪 · M. Jaminon🇧🇪 · J.P. Lansberg🇧🇪 · P. Stassart🇧🇪
Abstract
We give the results of a simple model for the diagonal and off-diagonal valence quark distributions of a pion. We show that structure can be implemented in a gauge-invariant manner. This explicit model questions the validityof the momentum sum rule, and gives an explicit counter-example to the Wandzura-Wilczek ansatz for twist-3 GPD's.
Comments: 11 pages, presented at HADRONIC PHYSICS (HLPR 2004): Joint Meeting-Heidelberg-Liege-Paris-Rostock, Spa, Belgium, 16-18 December 2004, 11 pages, 11 figures, LaTeX