Abstract
Three recent experiments have used the ratio of e+ p to e− p elastic scattering to directly determine the two-photon exchange (TPE) contribution to the elastic-scattering process. These experiments by CLAS, VEPP-3 and OLYMPUS were motivated by the discrepancy between Rosenbluth separation and polarization transfer measurements of the electromagnetic form factors of the proton. The results of these experiments cover Q2 < 2 GeV2 and collectively agree well with TPE model predictions that largely explain the form factor discrepancy.
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