Nondecoupling effects related to a large $m_t$ affecting nonoblique radiative corrections in vertices $\left(Z\overline{b}b\right)$ and boxes ( $B$- $\overline{B}$ mixing and ${\epsilon }_K$) are sensitive to the mechanism of spontaneous symmetry breaking. In the framework of the effective chiral electroweak standard model there is only one $O\left(p^4\right)$ operator which modifies the longitudinal part of the $W^{+}$ boson without touching the oblique corrections. This operator affects the $Z\overline{b}b$ vertex, the $B$- $\overline{B}$ mixing, and the $\mathrm{CP}$-violating parameter ${\epsilon }_K$, generating interesting correlations among the hard $m_t^4\ln m_t^2$ corrections to these observables.

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