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

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

2010-12-16

arxiv.org/abs/1012.3746v1

Phys.Rev.D83:057501,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 3 figures

Scientific paper

10.1103/PhysRevD.83.057501

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, \delta G_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.

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