Two-Photon-Exchange Correction to Parity-Violating Elastic Electron-Proton Scattering

Details Two-Photon-Exchange Correction to Parity-Violating Elastic Electron-Proton Scattering Two-Photon-Exchange Correction to Parity-Violating Elastic Electron-Proton Scattering

2005-02-14

arxiv.org/abs/hep-ph/0502128v1

Phys.Rev.Lett.94:212301,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.212301

Higher-order QED effects play an important role in precision measurements of nucleon elastic form factors in electron scattering. Here we introduce a two-photon exchange QED correction to the parity-violating polarization asymmetry of elastic electron-proton scattering. We calculate this correction in the parton model using the formalism of generalized parton distributions, and demonstrate that it can reach several per cent in certain kinematics, becoming comparable in size with existing experimental measurements of strange-quark effects in the proton neutral weak current.

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