Limits on nonstandard top quark couplings from electroweak measurements
Limits on nonstandard top quark couplings from electroweak measurements
We calculate the typical size of loop corrections to electroweak observables arising from nonstandard Zt\ifmmode\bar\else\textasciimacron\fi{}t and Wtb vertices. We use an effective Lagrangian formalism based on the electroweak gauge gorup SU(2${)}_{\mathit{L}}$\ifmmode\times\else\texttimes\fi{}U(1${)}_{\mathit{Y}}$\ensuremath{\rightarrow}U(1${)}_{\mathrm{EM}}$. Limits on the nonstandard model top quark couplings from electroweak observables are presented and compared with previously obtained limits. …