Target-normal single-spin asymmetry in elastic electron-nucleon scattering

Abstract

We estimate the target-normal single-spin asymmetry at nearly forward angles in elastic electron-nucleon scattering. In the leading-order approximation, this asymmetry is proportional to the imaginary part of the two-photon exchange (TPE) amplitude, which can be expressed as an integral over the doubly virtual Compton scattering (VVCS) tensor. We develop a model that parametrizes the VVCS tensor for the case of nearly forward scattering angles. Our parametrization ensures a proper normalization of the imaginary part of the TPE amplitude on the well-known forward limit expression, which is given in terms of nucleon structure functions measurable in inelastic electron-nucleon scattering experiments. We discuss applicability limits of our theory and provide target-normal single-spin asymmetry predictions for both elastic electron-proton and electron-neutron scattering.

arXiv comment14 pages, 6 figures; v2: contains extended discussions, results are unchanged; v3: minor changes, matches published version; v4: corrected Fig. 5

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Cited by in corpus (4)

• Beam-normal single-spin asymmetry in elastic scattering of electrons from a spin-0 nucleus
• Lepton mass effects for beam-normal single-spin asymmetry in elastic muon-proton scattering
• Parity-Violating Inelastic Electron-Proton Scattering at Low $Q^2$ Above the Resonance Region
• Target normal single-spin asymmetry in inclusive electron-nucleon scattering in the 1/Nc expansion