Global analysis of proton elastic form factor data with two-photon exchange corrections

Abstract

We use the world's data on elastic electron-proton scattering and calculations of two-photon exchange effects to extract corrected values of the proton's electric and magnetic form factors over the full ${Q}^{2}$ range of the existing data. Our analysis combines the corrected Rosenbluth cross section and polarization transfer data, and is the first extraction of ${G}_{E}$ and ${G}_{M}$ including explicit two-photon exchange corrections and their associated uncertainties. In addition, we examine the angular dependence of the corrected cross sections to examine the possible nonlinearities of the cross section as a function of \ensuremath{\varepsilon}.