Precision electroweak experiments and heavy physics: An update

Abstract

We update our previous global analysis of weak neutral current and $Z$ and $W$ data in which the parameters ${h}_{V}$ and ${h}_{A}$ associated with new heavy physics were constrained, by incorporating recent results on $Z$ properties and ${M}_{W}$. We obtain $\ensuremath{-}0.93<{h}_{V}<0.33$, $\ensuremath{-}1.9<{h}_{\mathrm{AZ}}<0.27$, and $\ensuremath{-}2.5<{h}_{\mathrm{AW}}<1.5$ at 90% C.L., considerably better than the previous limits.