Two-photon exchange amplitudes for the elastic $ep$ scattering at Q^2=2.5 GeV^2 from the experimental data

Abstract

We extract two-photon exchange amplitudes for the elastic electron-proton scattering at Q^2=2.5 GeV^2 from the unpolarized cross-section and recent polarization transfer measurements. There are three independent amplitudes, but only one of them, δG_M, can be determined with a reasonable accuracy(about 10%). The result is in good agreement with theoretical predictions. Rough estimates for two other amplitudes are obtained.

3 pages, 3 figures

References in corpus (3)

• Global analysis of proton elastic form factor data with two-photon exchange corrections
• Two-photon exchange in dispersion approach
• Phenomenological analysis of two-photon exchange effects in proton form factor measurements

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• Super-Rosenbluth Measurements with Electrons and Positrons