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Direct Measurement of Ab in Z0 Decays using Charged Kaon Tagging


We present a direct measurement of the parity-violating asymmetry Ab in the Z0 to b anti-b coupling using a new technique to distinguish the b and anti-b quarks using charged kaons from B decays. The Z0 bosons are produced in e+e- collisions at the SLC with longitudinally polarized electrons. b anti-b events are selected using a secondary vertex mass tag and Ab is determined from the left-right forward-backward asymmetry. From the 1994-1995 data sample, selected from 100,000 hadronic Z0 decays, we obtain Ab = 0.855 ± 0. 088stat ± 0.102sys.

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