6533b853fe1ef96bd12ad3ca
RESEARCH PRODUCT
Two-photon exchange contribution to elastic e− -proton scattering: Full dispersive treatment of πN states and comparison with data
Oleksandr TomalakBarbara PasquiniMarc Vanderhaeghensubject
PhysicsScattering cross-sectionAmplitude010308 nuclear & particles physicsDispersion relationProton scattering0103 physical sciencesMomentum transferIntermediate stateAtomic physics010306 general physics01 natural sciencesNuclear theorydescription
We evaluate the two-photon exchange correction to the elastic electron-proton scattering cross section within a dispersive framework. Besides the elastic contribution, we account for all $\ensuremath{\pi}N$ intermediate state contributions using the phenomenological MAID fit as an input. We develop a novel method for the analytical continuation of the two-photon exchange amplitudes into the unphysical region and generalize our previous work to the momentum transfer region $0.064\text{ }\text{ }{\mathrm{GeV}}^{2}\ensuremath{\lesssim}{Q}^{2}\ensuremath{\lesssim}1\text{ }\text{ }{\mathrm{GeV}}^{2}$. We compare our results with recent OLYMPUS, CLAS and VEPP-3 data as well as with empirical fits and estimates in the forward angular region.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-11-08 | Physical Review D |