Search for evidence of two photon contribution in elastic electron proton data

Abstract

We reanalyze the most recent data on elastic electron proton scattering. We look for a deviation from linearity of the Rosenbluth fit to the differential cross section, which would be the signature of the presence of two photon exchange. The two photon contribution is parametrized by a one parameter formula, based on symmetry arguments. The present data do not show evidence for such deviation.

Comments: 15 pages 3 figures More details on the fitting procedure, more explicit explanations