Abstract
The apparent discrepancy between the Rosenbluth and the polarization transfer method for the ratio of the electric to magnetic proton form factors can be explained by a two-photon exchange correction which does not destroy the linearity of the Rosenbluth plot. Though intrinsically small, of the order of a few percent of the cross section, this correction is kinematically enhanced in the Rosenbluth method while it is small for the polarization transfer method, at least in the range of Q 2 where it has been used until now.
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Guichon, P. (2005). Two photon effects in electron scattering. In: Kox, S., Lhuillier, D., Maas, F., van de Wiele, J. (eds) From Parity Violation to Hadronic Structure and more. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26345-4_4
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DOI: https://doi.org/10.1007/3-540-26345-4_4
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