[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-8689
Final Results on Electroweak Asymmetries from SLD

Abstract

\begin{abstract} \noindent I present the final measurements of the $Z$ boson-lepton coupling asymmetry parameters $A_e$, $A_{\mu}$, and $A_{\tau}$, obtained from the complete sample of polarized $Z$ bosons collected by the SLD detector at the SLAC Linear Collider. The measurements use leptonic $Z$ decays and the results are $A_e = 0.1544 \pm 0.0060$, $A_{\mu} = 0.142 \pm 0.015 $, and $A_{\tau} = 0.136 \pm 0.015 $. The $A_e$ result is combined with the left-right asymmetry using $Z$ decays to hadrons, $A^0_{LR}(\equiv A_e)$, and is found to be $A_e = 0.1516 \pm 0.0021 $. Assuming lepton universality, a combined effective weak mixing angle of $\sin^2\theta^{eff}_W = 0.23098 \pm 0.00026$ is obtained. Using additional Standard-Model parameters an upper limit on the Higgs mass is given. \end{abstract}

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