Some general properties of theO(α)corrections to parity violation in atoms

The model-dependent contributions to the parity-violating electron-nucleon interaction arising from $\gamma Z$ box diagrams are discussed on the basis of a formulation in which the hadronic parts of the amplitude are treated exactly ab initio. This leads to a derivation of general properties and more refined estimates of these effects. A method to take into account the large-distance part of the hadronic contributions to the $\gamma Z$ mixing diagrams using experimental information on $e^{+}+e^{-}$→hadrons is briefly discussed. Predictions for the $C_{\mathrm{iN}} (i=1,2, N=p,n)$ are updated taking into account the more detailed estimates of this paper.