Measurements of $A_{LR}$, $A_{lepton}$ and $A_b$ from SLD

Abstract

We present the measurements of the leptonic asymmetries in $Z^0$ decays measured by the SLD experiment at SLAC. A data sample of approximately 550,000 $Z^0$ bosons are used for the preliminary measurement of $A_{LR}(A_e)$ and the leptonic final state measurements of $A_e$, $A_{\mu }$ and $A_{\tau }$, representing the entire set of 1992-1998 SLD runs. When combining all results, a preliminary value for the effective weak mixing angle is obtained: ${\sin }^2{\theta }_W^{eff}=0.23109\pm 0.00029$. We also present the direct measurements of $A_b$ from left-right forward-backward asymmetries, using partial data samples from 1993-1998 SLD runs. The preliminary value combines jet charge, cascade kaon and semileptonic decay analyses to obtain $A_b=0.866\pm 0.036$.

5 pages RevTex, 1 eps figure, Submitted to DPF99 Conference Proceedings, Parallel Sessions Talk 01-02