Measurement of Ab and Ac at the Z0 pole using a lepton tag

The parity violation parameters of Zb{bar b} and Zc{bar c} couplings have been measured using the polar angle dependency of the Z{sup 0}-pole polarized cross section and tagging the bottom and charmed hadrons in the semileptonic decay channel. Both the muon and electron identification algorithms take advantage of multivariate techniques, incorporating information from the SLD Cerenkov Ring Imaging Detector. Based on the 1993-95 SLD samples of 50,000 Z{sup 0} decays with a mean electron beam polarization of = 63%, and 100,000 Z{sup 0} decays with a mean electron beam polarization of = 77%, this yields the following measurements of A{sub b} and A{sub c}: A{sub b} = 0.877 {+-} 0.068(stat) {+-} 0.047 (syst), A{sub c} = 0.614 {+-} 0.104(stat) {+-} 0.074(syst).