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We study the effects on the vector-boson parameters due to a heavy scalar singlet interacting strongly with the Higgs sector of the standard model. The one-loop-induced effects due to the additional scalar are not suppressed by inverse powers of its mass. In the limit that the singlet-Higgs coupling becomes much larger than the Higgs self-coupling, the 4W vertex differs from that in the standard model. In this limit the leading corrections are not related to the divergences of the gauged nonlinear {σ} model.
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Hill et al. (1987) studied this question.
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