We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer through the scattering off a parton in the proton. We relate the two-photon exchange amplitude to the generalized parton distributions which appear in hard exclusive processes. We find that when taking the polarization transfer determinations of the form factors as input, adding in the 2-photon correction does reproduce the Rosenbluth cross sections.
No takes yet. Share an insight, caveat, or question.
Chen et al. (2004) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: