Spectral-function sum rules forWboson in the weak- and strong-coupling versions of the standard model

The QCD-like sum-rule method is applied to the W boson in the strong-coupling version of the standard model. For comparison the same methods are applied to the perturbative [Glashow-Salam-Weinberg (GSW)] version of the model. It is shown that the method works in the GSW model with good accuracy independent of the continuum threshold if the definition of the so-called sum-rule window is changed. In the strong-coupling model, one cannot ``predict'' the W-boson mass because the vacuum expectation values (VEV's) are unknown. Instead, a restriction on VEV's coming from the experimental data can be found when some additional assumptions about the W' contribution are made. These restrictions can be useful in the application of the sum-rule method to other channels (Higgs, isoscalar vector, excited fermions, leptoquarks, etc.). The vacuum structure in the strong-coupling model may differ considerably from the GSW model.