HardmtCorrections as a Probe of the Symmetry Breaking Sector

Abstract

Nondecoupling effects related to a large ${m}_{t}$ affecting nonoblique radiative corrections in vertices $(Z\overline{b}b)$ and boxes ( $B$- $\overline{B}$ mixing and ${\ensuremath{\epsilon}}_{K}$) are sensitive to the mechanism of spontaneous symmetry breaking. In the framework of the effective chiral electroweak standard model there is only one $O({p}^{4})$ 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 ${\ensuremath{\epsilon}}_{K}$, generating interesting correlations among the hard ${m}_{t}^{4}\mathrm{ln}{m}_{t}^{2}$ corrections to these observables.