Guichon P A M, Vanderhaeghen M
SPhN/DAPNIA, CEA Saclay, F91191 Gif sur Yvette, France.
Phys Rev Lett. 2003 Oct 3;91(14):142303. doi: 10.1103/PhysRevLett.91.142303.
The apparent discrepancy between the Rosenbluth and the polarization transfer methods 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 accidentally amplified in the case of the Rosenbluth method.
