Peter Blunden

Univ. of Manitoba, Canada

Two-photon exchange of electron-proton scattering

Two photon exchange contributions to elastic electron-proton scattering are small in magnitude, but have a strong angular dependence at fixed Q2. This is significant for the Rosenbluth technique for determining the ratio of electric and magnetic form factors of the proton at high Q2. In this talk I will discuss recent estimates of two-photon exchange effects on both Rosenbluth and polarization transfer experiments.

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