Two-photon exchange at low Q^2

Details Two-photon exchange at low Q^2 Two-photon exchange at low Q^2

2006-12-26

arxiv.org/abs/nucl-th/0612104v1

Phys.Rev.C75:038202,2007

Physics

Nuclear Physics

Nuclear Theory

5 pages, 4 figures

Scientific paper

10.1103/PhysRevC.75.038202

We study two-photon exchange for elastic electron-proton scattering at low Q^2. Compact approximate formulae for the amplitudes are obtained. Numerical calculations are done for Q^2 < 0.1 GeV^2 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-Q^2 electron-neutron scattering two-photon exchange corrections are shown to be negligibly small.

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