Production of Charm and Beauty ine + e, with Polarized Electron Beam 1

The test of the Standard Model through the measurements of Z to fermion couplings can bene t from much enhanced sensitivity by using longitudinally polarized electron beams. This report reviews preliminary electroweak measurements from SLD on heavy quark production at the Z, using 150,000 hadronic Z decays accumulated during the 93-95 runs with high electron beam polarization. The parity violating parameters Ab and Ac of the Zbb and Zcc couplings are measured directly from the left-right forward-backward asymmetries. A measurement of Rb with a lifetime double tag and a summary of the preliminary measurement of ALR from the 93-95 SLD data are also included in this report. Presented at the 6th International Symposium on Heavy Flavor Physics June 6{10, 1995, Pisa, Italy. Work supported in part by Department of Energy contracts: DE{FG02{91ER40676 (BU), DE{FG03{92ER40701 (CIT), DE{FG03{91ER40618 (UCSB), DE{FG03{92ER40689 (UCSC), DE{FG03{93ER40788 (CSU), DE{FG02{91ER40672 (Colorado), DE{FG02{91ER40677 (Illinois), DE{AC03{76SF00098 (LBL), DE{FG02{92ER40715 (Massachusetts), DE{AC02{ 76ER03069 (MIT), DE{FG06{85ER40224 (Oregon), DE{AC03{76SF00515 (SLAC), DE{ FG05{91ER40627 (Tennessee), DE{AC02{76ER00881 (Wisconsin), DE{FG02{92ER40704 (Yale); National Science Foundation grants: PHY{91{13428 (UCSC), PHY{89{21320 (Columbia), PHY{92-04239 (Cincinnati), PHY{88{17930 (Rutgers), PHY{88{19316 (Vanderbilt), PHY{92{03212 (Washington); the UK Science and Engineering Research Council (Brunel and RAL); the Istituto Nazionale di Fisica Nucleare of Italy (Bologna, Ferrara, Frascati, Pisa, Padova, Perugia); and the Japan-US Cooperative Research Project on High Energy Physics (Nagoya, Tohoku). SLD Collboration members and institutions are listed after the references.