Generalized parton distributions, nucleon form factors, and large‐t processes*

Abstract

AbstractThe connection of generalized parton distributions (GPDs) to processes at large momentum transfer (high‐t), and the links between GPDs and elastic nucleon form factors are discussed here. These links, in the form of sum rules, represent powerful constraints on parametrizations of GPDs. A Regge parametrization for the GPDs at small‐t, which is surprisingly observed from the chiral quark soliton model results, is extended to the large‐t region and it is found to catch the basic features of proton and neutron electromagnetic form factor data. It is furthermore discussed how these GPDs at large‐t enter into two‐photon exchange processes and resolve the discrepancy between Rosenbluth and polarization experiments of elastic electron nucleon scattering.