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Description:
We address the discrepancy between the Rosenbluth and polarization transfer data for the electromagnetic form factors of the nucleon. Assuming that the effect of two-photon corrections on the polarization transfer data is negligible, we obtain a model-independent estimate of the two-photon correction Delta(2 gamma). We analyze the polarization transfer data and the cross section data separately using dispersion relations. A central value as well as an error estimate for Delta(2 gamma) is then obtained from a comparison of the two analyses. The resulting values for Delta(2 gamma) are in good agreement with direct calculations available in the literature. (c) 2007 Elsevier B.V. All rights reserved.