Two-photon exchange in dispersion approach

Details Two-photon exchange in dispersion approach Two-photon exchange in dispersion approach

2008-04-25

arxiv.org/abs/0804.4128v1

Phys.Rev.C78:025208,2008

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1103/PhysRevC.78.025208

We calculate two-photon exchange amplitude for the elastic electron-proton scattering in the framework of dispersion relations. The imaginary part of the amplitude is determined by unitarity. Since in the unitarity relation intermediate states are on shell, off-shell form factors are not needed for the calculation. The real part is then evaluated using analytical properties of the amplitude. The expression for the elastic contribution to the amplitude, obtained in our approach, differs from the results of traditional calculations with on-shell form factors. Nevertheless, numerically the difference is minor for Q^2 up to 6 GeV^2.

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