Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-02-01
Phys.Rev.D72:013008,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
38 pages, 22 figures
Scientific paper
10.1103/PhysRevD.72.013008
We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer by using a quark-parton representation of virtual Compton scattering. We thus can relate the two-photon exchange amplitude to the generalized parton distributions which also enter in other wide angle scattering processes. We find that the interference of one- and two-photon exchange contribution is able to substantially resolve the difference between electric form factor measurements from Rosenbluth and polarization transfer experiments. Two-photon exchange has additional consequences which could be experimentally observed, including nonzero polarization effects and a positron-proton/electron-proton scattering asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it acquires a measurable curvature, particularly at large laboratory angle.
Afanasev Andrei V.
Brodsky Stanley J.
Carlson Carl E.
Chen Yu-Chun
Vanderhaeghen Marc
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