Description: We present a new preliminary combination of measurements of the parity-violation parameter A<sub>b</sub> made by the SLD collaboration using various experimental techniques. The techniques differ in detail, but in general a sample of b anti-b events is selected or enhanced by using the topologically reconstructed mass of the separated vertices formed by decaying B hadrons. The direction of the b(anti-b) quark is signed by one of four final state tags: jet charge, vertex charge, leptons, or identified K<sup>=</sup> from the b vertex. We account for statistical and systematic correlations between the four analyses to arrive at our combined result: A<sub>b</sub> = 0.905 ± 0.017(stat) ± 0.020(syst).
Date: July 27, 1999
Creator: Crawford, Glen D
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