6533b830fe1ef96bd1297c38

RESEARCH PRODUCT

Two-photon exchange corrections in elastic electron-proton scattering

Oleksandr Tomalak

subject

PhysicsElastic scatteringPhotonNuclear TheoryProtonScatteringMomentum transferCompton scatteringFOS: Physical sciencesElectronNuclear Theory (nucl-th)Nuclear physicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Charge radiusNuclear Experiment

description

We apply a subtracted dispersion relation (DR) formalism with the aim to improve predictions for the two-photon exchange (TPE) corrections to elastic electron-proton scattering observables at small momentum transfers. We study the formalism on the elastic TPE contribution in comparison with existing data for unpolarized cross sections. We extend the general formalism of TPE to elastic scattering with massive lepton and perform a numerical estimate of the muon-proton scattering at low momentum transfer in view of the upcoming muon-proton scattering experiment (MUSE). We study the influence of the double-virtual Compton scattering (VVCS) subtraction function on the unpolarized lepton-proton scattering cross-section. We show that the resulting TPE correction is negligible in the electron-proton scattering and smaller than planned uncertainties of the MUSE experiment for the subtraction functions evaluated in chiral perturbation theory.

yearjournalcountryeditionlanguage
2015-09-17Proceedings of 53rd International Winter Meeting on Nuclear Physics — PoS(Bormio2015)
https://doi.org/10.22323/1.238.0015