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The two-photon exchange contribution to elastic electron-nucleon scattering at large momentum transfer

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arxiv hep-ph/0502013 v1 pith:VW6BEZ3E submitted 2005-02-01 hep-ph nucl-th

Andrei V. Afanasev , Stanley J. Brodsky , Carl E. Carlson , Yu-Chun Chen , Marc Vanderhaeghen This is my paper · ORCID
classification hep-phnucl-th
keywords exchangescatteringtwo-photoncontributionlargetransferangleelastic
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We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer by using a quark-parton representation of virtual Compton scattering. We thus can relate the two-photon exchange amplitude to the generalized parton distributions which also enter in other wide angle scattering processes. We find that the interference of one- and two-photon exchange contribution is able to substantially resolve the difference between electric form factor measurements from Rosenbluth and polarization transfer experiments. Two-photon exchange has additional consequences which could be experimentally observed, including nonzero polarization effects and a positron-proton/electron-proton scattering asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it acquires a measurable curvature, particularly at large laboratory angle.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Manifest Gauge Invariance for Structure Dependent Radiative Corrections to Processes Involving Atoms and Nuclei

    nucl-th 2025-05 accept novelty 6.0 of 10

    The paper derives a manifestly gauge-invariant decomposition of the two-photon-exchange hadronic tensor in the zero-recoil limit, enabling gauge-invariant closure and density-only approximations.

  2. Radiative Corrections to Elastic Lepton-Proton Scattering with Focus on Two-Photon-Exchange Diagrams

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    Complete NLO QED radiative corrections to elastic lepton-proton scattering including TPE contributions with momentum-dependent form factors and numerical impact assessment.

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