The Two-Photon-Exchange and γZ-Exchange Corrections to parity-Violating Elastic Electron-Proton Scattering

Abstract

Leading electroweak corrections play an important role in precision measurements of the strange form factors. We calculate the two-photon-exchange (TPE) and $\gamma Z$-exchange corrections to the parity-violating asymmetry of the elastic electron-proton scattering in a simple hadronic model including the finite size of the proton. We find both can reach a few percent and are comparable in size with the current experimental measurements of strange-quark effects in the proton neutral weak current. The effect of $\gamma Z$-exchange is in general larger than that of TPE, especially at low momentum transfer $Q^2\le 1Ge{V}^2$. Their combined effects on the values of $G_E^s+\beta G_M^s$ extracted in recent experiments can be as large as -40% in certain kinematics.

4 pages, 3 Figs

References in corpus (24)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Automatized One-Loop Calculations in 4 and D dimensions
• The ratio of proton's electric to magnetic form factors measured by polarization transfer
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• Two-photon exchange and elastic electron-proton scattering
• Intermediate-Energy Semileptonic Probes of the Hadronic Neutral Current
• Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment
• Partonic calculation of the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer
• Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q^2=0.230 (GeV/c)^2
• The Strange Quark Contribution to the Proton's Magnetic Moment
• Precision Measurements of the Nucleon Strange Form Factors at Q^2 ~0.1 GeV^2
• Parity-violating electroweak asymmetry in $\vec{e}p$ scattering
• Evidence for Strange Quark Contributions to the Nucleon's Form Factors at $Q^2$ = 0.108 (GeV/c)${}^2$
• Measurement of the Proton's Neutral Weak Magnetic Form Factor
• Proton-Antiproton Annihilation and Meson Spectroscopy with the Crystal Barrel
• Constraints on the Nucleon Strange Form Factors at Q^2 ~ 0.1 GeV^2
• The SAMPLE Experiment and Weak Nucleon Structure
• Low-Energy Parity-Violation and New Physics
• Parity-Violating Electron Scattering and Neucleon Structure
• Polarization Observables in Phi Meson Photoproduction and the Strangeness Content of the Proton
• Two-Photon-Exchange Correction to Parity-Violating Elastic Electron-Proton Scattering
• Electroproduction of phi meson from proton and the strangeness in the nucleon
• Strangeness and Hadron Structure

Cited by in corpus (22)

• Review of two-photon exchange in electron scattering
• Model-dependence of the $\gamma Z$ dispersion correction to the parity-violating asymmetry in elastic $ep$ scattering
• gamma-Z corrections to forward-angle parity-violating e-p scattering
• New formulation of gamma-Z box corrections to the weak charge of the proton
• Gamma-Z box contributions to parity violating elastic e-p scattering
• Constrained gamma-Z interference corrections to parity-violating electron scattering
• Detailed analysis of two-boson exchange in parity-violating e-p scattering
• $\Delta (1232)$ Resonance Contribution to Two-Photon Exchange in Electron-Proton Scattering Revisited
• Nuclear isospin mixing and elastic parity-violating electron scattering
• Two-photon exchange effect on deuteron electromagnetic form factors
• Effect of two-boson exchange on parity-violating e-p scattering
• On the two-boson exchange corrections to parity-violating elastic electron-proton scattering
• Form factors and other measures of strangeness in the nucleon
• Phenomenological extraction of two-photon exchange amplitudes from elastic electron-proton scattering cross section data
• Contribution of Two-Boson-Exchange with $\Delta (1232)$ Excitation to Parity-Violating Elastic Electron-Proton Scattering
• Two-photon exchange corrections to ${\gamma }^{\ast }N\Delta$ form factors for $Q^2\le 4$ (Gev/$c$)${}^2$
• Estiamte of the two-photon exchange effect on deuteron electromagnetic form factors
• Two-Photon-Exchange Effects and $\Delta (1232)$ Deformation
• Relevance of Two Boson Exchange Effect in Quasi-Elastic Charged Current Neutrino-Nucleon Interaction
• The strangeness form factors of the proton within nonrelativistic constituent quark model revisited
• The loop corrections to the parity-violating electron-proton elastic scattering
• Proton strangeness form factors in (4,1) clustering configurations