We analyze the bounds on the Higgs pseudo-observables following from electroweak constraints, under the assumption that the Higgs particle is the massive excitation of an $SU(2)_L$ doublet. Using such bounds, detailed predictions for $h\to 4\ell$ decay rates, dilepton spectra, and lepton-universality ratios are presented.

Anomalous couplings of the Z boson to top quarks are only marginally constrained by direct searches and are still sensitive to new particle dynamics at the TeV scale. Employing an effective field theory approach we consider the dimension-six operators which generate deviations from the standard-model vector and axial-vector interactions. We show that rare B and K meson decays together with electroweak precision observables provide strong constraints on these couplings. We also consider constraints from t-channel single-top production.

We analyze the bounds on the Higgs pseudo-ob-servables following from electroweak constraints, under the assumption that the Higgs particle is the massive excitation of an SU ( 2 ) L doublet. Using such bounds, detailed predictions for h → 4 (cid:96) decay rates, dilepton spectra, and lepton-universality ratios are presented.