Resonance estimates for single spin asymmetries in elastic electron-nucleon scattering

Abstract

We discuss the target and beam normal spin asymmetries in elastic electron-nucleon scattering which depend on the imaginary part of two-photon exchange processes between electron and nucleon. We express this imaginary part as a phase space integral over the doubly virtual Compton scattering tensor on the nucleon. We use unitarity to model the doubly virtual Compton scattering tensor in the resonance region in terms of ${\gamma }^{\ast }N\to \pi N$ electroabsorption amplitudes. Taking those amplitudes from a phenomenological analysis of pion electroproduction observables, we present results for beam and target normal single spin asymmetries for elastic electron-nucleon scattering for beam energies below 1 GeV and in the 1-3 GeV region, where several experiments are performed or are in progress.

36 pages, 16 figures

References in corpus (17)

• 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
• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Two-photon exchange and elastic electron-proton scattering
• How to reconcile the Rosenbluth and the polarization transfer method in the measurement of the proton form factors
• Dispersion relations in real and virtual Compton scattering
• Partonic calculation of the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer
• Measurements of electron-proton elastic cross sections for $0.4<Q^2<5.5(GeV/c{)}^2$
• Precise Neutron Magnetic Form Factors
• Measurement of the Electric Form Factor of the Neutron at Q^2=0.5 and 1.0 (GeV/c)^2
• Virtual Compton Scattering off the nucleon
• New empirical fits to the proton electromagnetic form factors
• Measurement of the vector analyzing power in elastic electron-proton scattering as a probe of double photon exchange amplitudes
• The GDH Sum Rule and Related Integrals
• Beam normal spin asymmetry in elastic lepton-nucleon scattering
• The E2/M1 and C2/M1 ratios and form factors in N -> Delta transitions
• Type II Duality Symmetries in Six Dimensions

Cited by in corpus (38)

• The two-photon exchange contribution to elastic electron-nucleon scattering at large momentum transfer
• Two-Photon Physics in Hadronic Processes
• The proton charge radius
• Two-photon exchange in elastic electron-proton scattering
• Measurement of the Transverse Beam Spin Asymmetry in Elastic Electron Proton Scattering and the Inelastic Contribution to the Imaginary Part of the Two-Photon Exchange Amplitude
• Subtracted dispersion relation formalism for the two-photon exchange correction to elastic electron-proton scattering: comparison with data
• New Measurements of the Transverse Beam Asymmetry for Elastic Electron Scattering from Selected Nuclei
• The P2 Experiment - A future high-precision measurement of the electroweak mixing angle at low momentum transfer
• Two-photon exchange contribution to elastic $e^{-}$-proton scattering: Full dispersive treatment of $\pi N$ states and comparison with data
• Transverse Beam Spin Asymmetries in Forward-Angle Elastic Electron-Proton Scattering
• Analyzing power in elastic scattering of the electrons off a spin-0 target
• Dispersive contributions to $e^{+}p/e^{-}p$ cross section ratio in forward regime
• $\Delta (1232)$ Resonance Contribution to Two-Photon Exchange in Electron-Proton Scattering Revisited
• Dispersion relation formalism for the two-photon exchange correction to elastic muon-proton scattering: elastic intermediate state
• Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasi-elastic Electron-Deuteron Scattering
• Measurement of the Target-Normal Single-Spin Asymmetry in Quasi-Elastic Scattering from the Reaction ${}^3$He${}^{\uparrow }(e,e^{\prime })$
• Two-photon exchange corrections to elastic $e^{-}$-proton scattering: Full dispersive treatment of $\pi N$ states at low momentum transfers
• Transverse single spin asymmetries in inclusive deep-inelastic scattering
• New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering Over a Range of Spin-0 Nuclei
• The Vector Analyzing Power in Elastic Electron-Proton Scattering
• Beam normal spin asymmetry for the $ep\to e\Delta (1232)$ process
• Beam normal spin asymmetry in the quasi-RCS approximation
• Doubly virtual Compton scattering and the beam normal spin asymmetry
• Target-normal single-spin asymmetry in elastic electron-nucleon scattering
• Beam normal spin asymmetry of elastic $eN$ scattering in the leading logarithm approximation
• Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering off ${}^{28}$Si and ${}^{90}$Zr
• Beam-normal single-spin asymmetry in elastic scattering of electrons from a spin-0 nucleus
• Precision Measurement of the Beam-Normal Single-Spin Asymmetry in Forward-Angle Elastic Electron-Proton Scattering
• Measurement of the Beam-Normal Single-Spin Asymmetry for Elastic Electron Scattering from ${}^{12}$C and ${}^{27}$Al
• Study of Two-Photon Exchange via the Beam Transverse Single Spin Asymmetry in Electron-Proton Elastic Scattering at Forward Angles over a Wide Energy Range
• Target Normal Spin Asymmetry of the Elastic ep-Scattering at Resonance Energy
• The two photon exchange amplitude in $ep$ and $e\mu$ elastic scattering: a comparison
• Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering
• Two photon exchange in elastic electron scattering off hadronic systems
• Extraction of proton form factors in the timelike region from unpolarized e+e- --> p pbar events
• Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion
• Electron Beam Single-Spin Asymmetries in the Resonance Region with Final Hadrons Observed
• Charge and spin asymmetries in elastic lepton-nucleon scattering