INDIRECT CONSTRAINTS ON THE TRIPLE GAUGE BOSON COUPLINGS FROM $\bm{Z\to b{\bar b}}$ PARTIAL WIDTH: AN UPDATE

Abstract

We update the indirect bounds on anomalous triple gauge couplings coming from the non-universal one-loop contributions to the [Formula: see text] width. These bounds, which are independent of the Higgs boson mass, are in agreement with the standard model predictions for the gauge boson self-couplings since the present value of Rb agrees fairly well with the theoretical estimates. Moreover, these indirect constraints on [Formula: see text] and [Formula: see text] are most stringent than the present direct bounds on these quantities, while the indirect limit on λZ is weaker than the available experimental data.