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Estimates for the quantum electrodynamical (QED) and dispersion effects on the spin asymmetry of perpendicularly polarized electrons scattered from a ^208Pb nucleus are given. The QED effects are calculated nonperturbatively in terms of their respective potentials. For dispersion, the transient nuclear excitations of ^208Pb with low multipolarity and energy below 30 MeV are accounted for. Collision energies up to 1 GeV are considered. The results can help to explain the measured spin asymmetry near 1 GeV at forward angles.
D. H. Jakubaßa-Amundsen (Thu,) studied this question.
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