Two-photon exchange at low Q2
Dmitry Borisyuk, Alexander Kobushkin
Abstract
We study two-photon exchange for elastic electron-proton scattering at low Q2. Compact approximate formulae for the amplitudes are obtained. Numerical calculations are done for Q2 < 0.1 GeV2 with several realistic form factor parameterizations, yielding similar results. They indicate that the corrections to magnetic form factor can visibly affect cross-section and proton radii. For low-Q2 electron-neutron scattering two-photon exchange corrections are shown to be negligibly small.
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