Reexamination of phenomenological two-photon exchange corrections to the proton form factors and e+-p scattering

Abstract

We extract the two-photon exchange (TPE) contributions to electron--proton elastic scattering using two parametrizations and compare the results to different phenomenological extractions and direct calculations of the TPE effects. We find that many of the extractions give similar results, and highlight the common assumptions and the impact of not including such assumptions. We provide a simple parametrization of the TPE contribution to the unpolarized cross section, along with an estimate of the fit uncertainties and the uncertainties associated with the assumptions made in the extraction. We look at the contributions as extracted from various e--p elastic scattering observables, and make predictions for ratio $R^{e^{+}{e}^{-}}$ of positron-proton to electron-proton elastic scattering cross sections.

11 pages, 7 figures

References in corpus (15)

• High-precision determination of the electric and magnetic form factors of the proton
• Nucleon Electromagnetic Form Factors
• Global analysis of proton elastic form factor data with two-photon exchange corrections
• Nucleon electromagnetic form factors
• Review of two-photon exchange in electron scattering
• Two-Photon Physics in Hadronic Processes
• Search for effects beyond the Born approximation in polarization transfer observables in $\vec{e}p$ elastic scattering
• Electromagnetic form factors of the nucleon: new fit and analysis of uncertainties
• Two-photon exchange in dispersion approach
• Box diagram in the elastic electron-proton scattering
• Is there model-independent evidence of the two-photon-exchange effect in the electron-proton elastic scattering cross section?
• Perturbative QCD predictions for two-photon exchange
• Two-photon exchange at low Q^2
• Phenomenological analysis of two-photon exchange effects in proton form factor measurements
• Comment on "High-Precision Determination of the Electric and Magnetic Form Factors of the Proton"

Cited by in corpus (17)

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• Nucleon form factors, generalized parton distributions and quark angular momentum
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• Flavor decomposition of the nucleon electromagnetic form factors
• Subtracted dispersion relation formalism for the two-photon exchange correction to elastic electron-proton scattering: comparison with data
• Measurement of two-photon exchange effect by comparing elastic $e^{\pm }p$ cross sections
• Two-photon exchange corrections to elastic electron-proton scattering at large momentum transfer within the SCET approach
• Comparison of Neural Network and Hadronic Model Predictions of Two-Photon Exchange Effect
• Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering
• Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^{\pm }p$ scattering
• Phenomenological extraction of two-photon exchange amplitudes from elastic electron-proton scattering cross section data
• How much two-photon exchange is needed to resolve the proton form factor discrepancy?
• Up- and Down-Quark Contributions to the Nucleon Form Factors
• Two-photon exchange in electron-trinucleon elastic scattering
• Gauge Invariant Two-Photon-Exchange Contributions in $e^{-}{\pi }^{+}\to e^{-}{\pi }^{+}$
• Super-Rosenbluth Measurements with Electrons and Positrons