6533b828fe1ef96bd1288632
RESEARCH PRODUCT
Two-photon exchange in elastic electron-proton scattering: a QCD factorization approach.
Marc VanderhaeghenNikolai Kivelsubject
Quantum chromodynamicsPhysicsParticle physicsPhotonScatteringMomentum transferFOS: Physical sciencesGeneral Physics and AstronomyElementary particleHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)FactorizationQuantum electrodynamicsPhoton polarizationNucleondescription
We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer $Q^2$. It is shown that the leading two-photon exchange amplitude behaves as $1/Q^4$ relative to the one-photon amplitude, and can be expressed in a model independent way in terms of the leading twist nucleon distribution amplitudes. Using several models for the nucleon distribution amplitudes, we provide estimates for existing data and for ongoing experiments.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-08-27 | Physical review letters |