Model-independent extraction of two-photon effects in elastic electron-proton scattering

Abstract

We address the discrepancy between the Rosenbluth and polarization transfer data for the electromagnetic form factors of the nucleon. Assuming that the effect of two-photon corrections on the polarization transfer data is negligible, we obtain a model-independent estimate of the two-photon correction Delta^(2γ). We analyze the polarization transfer data and the cross section data separately using dispersion relations. A central value as well as an error estimate for Delta^(2γ) is then obtained from a comparison of the two analyses. The resulting values for Delta^(2γ) are in good agreement with direct calculations available in the literature.

7 pages, 2 figures

References in corpus (18)

• 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
• Nucleon Electromagnetic Form Factors
• Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer
• Two-photon exchange and elastic electron-proton scattering
• Dispersion analysis of the nucleon form factors including meson continua
• Partonic calculation of the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer
• Two-photon exchange in elastic electron-nucleon scattering
• Radiative Corrections to Electron-Proton Scattering
• The two-photon exchange contribution to elastic electron-nucleon scattering at large momentum transfer
• How well do we know the electromagnetic form factors of the proton?
• Electromagnetic Form Factors of the Nucleon and Compton Scattering
• $\Delta$ resonance contribution to two-photon exchange in electron-proton scattering
• Polarization transfer in the ${}^4$He$(\vec{e},e^{\prime }{\vec{p}}^3$H reaction
• Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
• Status on nucleon electromagnetic form factors
• A Comparison of Polarization Observables in Electron Scattering from the Proton and Deuteron
• Coulomb distortion in high-Q^2 elastic e-p scattering

Cited by in corpus (13)

• Review of two-photon exchange in electron scattering
• The size of the proton - closing in on the radius puzzle
• The electromagnetic form factors of the proton in the timelike region
• Subtracted dispersion relation formalism for the two-photon exchange correction to elastic electron-proton scattering: comparison with data
• Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future
• Determination of two-photon exchange amplitudes from elastic electron-proton scattering data
• Comparison of Neural Network and Hadronic Model Predictions of Two-Photon Exchange Effect
• Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^{\pm }p$ scattering
• Lepton-Proton Two-Photon Exchange in Chiral Perturbation Theory
• Electromagnetic Form Factors of Nucleons with QCD Constraints Sytematic Study of the Space and Time-like Regions
• Resonances contribution to two-photon exchange effects and possible large forward-backward asymmetry in $e^{+}{e}^{-}\to p\bar{p}$
• Two-Photon Exchange in Electron-Proton Elastic Scattering: Theory Update
• Exact Relations for Two-Photon-Exchange Effect in Elastic $ep$ Scattering by Dispersion Relation and Hadronic Model