2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38345We present a new preliminary measurement of the parity-violation parameter Ab using a self-calibrating vertex-charge technique. In the SLD experiment we observe hadronic decays of polarized Z bosons produced in collisions between longitudinally polarized electrons and unpolarized positrons at the SLAC Linear Collider. A sample of bb events is selected using the topologically reconstructed mass of B hadrons. From out 1996-8 data sample of approximately 400,000 hadronic Z decays, we obtain Ab = 0.897 +/- 0.027 (stat) +0.036/-0.034 (syst).8 pages, 0 figures. Paper contributed to EPS-HEP 99 and Lepton-Photon Symposium 1999High Energy Physics - Experimenttext