Two-photon exchange amplitudes for the elastic ep scattering at Q2=2.5 GeV2 from the experimental data
Abstract
We extract two-photon exchange amplitudes for the elastic electron-proton scattering at Q2=2.5 GeV2 from the unpolarized cross-section and recent polarization transfer measurements. There are three independent amplitudes, but only one of them, δ GM, 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.
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