Towards a global analysis of generalized parton distributions

Abstract

We discuss the complexity of GPD phenomenology, comment on the technological needs for a global analysis, and report on model and neural network fits to the photon electroproduction off unpolarized proton. We also point out that Radyushkin's double distribution ansatz is a `holographic' GPD model.

Comments: LaTeX, 12 pages, 3 figures, proceedings of the "4th Workshop on Exclusive Reactions at High Momentum Transfer", TJNAF, May 18-21, 2010, plus additional references and footnotes