Two-photon exchange and elastic electron-proton scattering

Details Two-photon exchange and elastic electron-proton scattering Two-photon exchange and elastic electron-proton scattering

2003-06-25

arxiv.org/abs/nucl-th/0306076v2

Phys.Rev.Lett.91:142304,2003

Physics

Nuclear Physics

Nuclear Theory

4 pages, 4 figures, v2: additional references and minor clarifications in text, accepted in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.91.142304

Two-photon exchange contributions to elastic electron-proton scattering cross sections are evaluated in a simple hadronic model including the finite size of the proton. The corrections are found to be small in magnitude, but with a strong angular dependence at fixed $Q^2$. This is significant for the Rosenbluth technique for determining the ratio of the electric and magnetic form factors of the proton at high $Q^2$, and partly reconciles the apparent discrepancy with the results of the polarization transfer technique.

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