Two-photon exchange in elastic electron-proton scattering : QCD factorization approach

Details Two-photon exchange in elastic electron-proton scattering : QCD factorization approach Two-photon exchange in elastic electron-proton scattering : QCD factorization approach

2009-05-03

arxiv.org/abs/0905.0282v1

Phys.Rev.Lett.103:092004,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.103.092004

We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer $Q^2$. It is shown that the leading two-photon exchange amplitude behaves as $1/Q^4$ relative to the one-photon amplitude, and can be expressed in a model independent way in terms of the leading twist nucleon distribution amplitudes. Using several models for the nucleon distribution amplitudes, we provide estimates for existing data and for ongoing experiments.

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