Two-photon exchange and elastic electron-proton scattering

Abstract

Two-photon exchange contributions to elastic electron-proton scattering cross sections are evaluated in a simple hadronic model including the finite size of the proton. The corrections are found to be small in magnitude, but with a strong angular dependence at fixed $Q^2$. This is significant for the Rosenbluth technique for determining the ratio of the electric and magnetic form factors of the proton at high $Q^2$, and partly reconciles the apparent discrepancy with the results of the polarization transfer technique.

4 pages, 4 figures, v2: additional references and minor clarifications in text, accepted in Physical Review Letters

References in corpus (6)

• Automatized One-Loop Calculations in 4 and D dimensions
• The ratio of proton's electric to magnetic form factors measured by polarization transfer
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• Radiative Corrections to Electron-Proton Scattering
• QED Radiative Corrections to Asymmetries of Elastic ep-scattering in Hadronic Variables
• Radiative Corrections to Elastic Electron-Proton Scattering for Polarized Electrons

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