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Time Dependent B(0,s)-Anti-B(0,s) Mixing Using Inclusive and Semileptonic B Decays at SLD


We set a preliminary 95% C.L. exclusion on the oscillation frequency of B(0,s)-anti-B(0,s) mixing using a sample of 250,000 hadronic Z0 decays collected by the SLD experiment at the SLC between January 1996 and March 1998. The analyses determine the b-hadron flavor at production by exploiting the large forward-backward asymmetry of polarized Z0->b anti-b decays as well as information from the hemisphere opposite that of the reconstructed B decay. In one analysis, B decay vertices are reconstructed inclusively with the a topological technique, and separation between B(0,s)-anti-B(0,s) decays exploits the B(0,s)->D(-,s) cascade charge structure. The other analysis selects semileptonic decays reconstructed by intersecting a lepton with the trajectory of a topologically reconstructed D meson. The two analyses are combined to excluder the following values of the B(0,s)-anti-B(0,s) mixing oscillation freqency: Deltams<1.7ps-1 and 3.3 ms<5.0ps-1 at the 95% confidence level.

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