Electron Beam Single-Spin Asymmetries in the Resonance Region with Final Hadrons Observed

Abstract

We study beam-transverse and normal single-spin asymmetry for electron-proton inelastic scattering in the resonance region for the case where a pion is observed in the final state. There is no beam single-spin asymmetry if the observed particle has single-photon exchange as its only interaction, but this is naturally circumvented when one observes a strongly interacting final state particle. The asymmetries are not large as there is an electron mass divided by momentum transfer suppression. We present results for the cases where the final electron and a pion are both observed, with asymmetries of order tens of ppm, and where only a final pion is observed, with asymmetries of order one ppm.

7 pages, 5 figures

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• Unitary Isobar Model - MAID2007
• Two-Photon Physics in Hadronic Processes
• Measurement of the two-photon exchange contribution to the elastic $e^{\pm }p$ scattering cross sections at the VEPP-3 storage ring
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• Measurement of the Target-Normal Single-Spin Asymmetry in Quasi-Elastic Scattering from the Reaction ${}^3$He${}^{\uparrow }(e,e^{\prime })$

Cited by in corpus (2)

• Beam normal spin asymmetry for the $ep\to e\Delta (1232)$ process
• Parity-Violating Inelastic Electron-Proton Scattering at Low $Q^2$ Above the Resonance Region