Abstract
Vector analyzing power ${A}_{n}$ is calculated for elastic electron scattering from a variety of spin-zero nuclei at energies from 14 MeV to 3 GeV. Time-reversal symmetry ensures that ${A}_{n}$ vanish in the first Born approximation. Therefore ${A}_{n}$ depends on Coulomb distortions and can be large for scattering from heavy nuclei. The vector analyzing power is a potential source of systematic error for parity-violation experiments. We find that ${A}_{n}=\ensuremath{-}0.361$ ppm for the kinematics of the parity radius experiment involving 850-MeV electrons scattering at ${6}^{\ifmmode^\circ\else\textdegree\fi{}}$ from $^{208}\mathrm{Pb}$. This is comparable with the parity-violating asymmetry. However, for HAPPEX He involving 3-GeV electrons scattering on $^{4}\mathrm{He}$ we find that ${A}_{n}$ is very small.
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