Partonic Interpretation of Generalized Parton Distributions

Abstract

Generalized Parton Distributions describe, within QCD factorization, the non perturbative component in the amplitudes for deeply virtual exclusive processes. However, in order for a partonic interpretation to hold, semi-disconnected diagrams should not contribute. We show that this condition is not satisfied for non-forward kinematics at leading order, and that gluon mediated re-interactions are essential for a consistent description in terms of parton degrees of freedom.

4 pages, 3 figures, replaced figure 2, revised conclusions, added references

References in corpus (6)

• Fully Unintegrated Parton Correlation Functions and Factorization in Lowest Order Hard Scattering
• Flexible Parametrization of Generalized Parton Distributions from Deeply Virtual Compton Scattering Observables
• Dispersion representations for hard exclusive processes
• Nucleon Tensor Charge from Exclusive ${\pi }^o$ Electroproduction
• Dispersion relations and subtractions in hard exclusive processes
• The Use of Dispersion Relations in Hard Exclusive Processes and the Partonic Interpretation of Deeply Virtual Compton Scattering