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A Direct Measurement of Parity Violation in the Coupling of Z0 Bosons to b Quarks Using a Mass Tag and Momentum-weighted Track Charge


We present a direct measurement of the parity-violation parameter Ab using a self-calibrating track-charge technique. In the SLD experiment we observe hadronic decays of Z0 bosons produced in collisions between longitudinally polarized electrons and unpolarized positrons at the SLAC Linear Collider. A sample of b anti-b events is selected using the topologically reconstructed mass of B hadrons. From our 1993-1995 sample of approximately 150 thousands hadronic Z0 decays, we obtain Ab = 0.911 +/- 0.045(stat) +/- 0.045(syst).

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