Two-Photon Exchange in Electron-Proton Elastic Scattering: Theory Update
classification
✦ hep-ph
keywords
exchangetwo-photoneffectselasticelectron-protonmechanismscatteringconsidered
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Recent theoretical developments in the studies of two-photon exchange effects in elastic electron-proton scattering are reviewed. Two-photon exchange mechanism is considered a likely source of discrepancy between polarized and unpolarized experimental measurements of the proton electric form factor at momentum transfers of several GeV$^2$. This mechanism predicts measurable effects that are currently studied experimentally.
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