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Reconstruct B 0 decay vertex using hadronic or semileptonic decay modes

K +. p s -. p -. D 0. B rec. B 0. p +.  (4 S ). B tag. B 0. b Z g  0.56. e - , m - , K - tag. D z ~260 m m. Reconstruct B 0 decay vertex using hadronic or semileptonic decay modes Reconstruct tagging vertex, measure D z = z rec – z tag  D t = D z / < b Z g >

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Reconstruct B 0 decay vertex using hadronic or semileptonic decay modes

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  1. K+ ps- p- D0 Brec B0 p+ (4S) Btag B0 bZg 0.56 e-, m-, K- tag Dz ~260 mm • Reconstruct B0 decay vertex using hadronic or semileptonic decay modes • Reconstruct tagging vertex, measure Dz= zrec– ztagDt = Dz / < bZ g > • Use e/m/K charge etc. to determine b flavor at the tagging vertex • Time dependence of mixed and unmixed events, in each tagging category (i) is • Form a likelihood function and extract tagging dilution w = (1- Di ) and Dmd PRELIMINARY

  2. Reconstruct hadronic and Semileptonic B0 decays in 8.9 fb-1 (4S) data B0 D* -l+ nl D*- D0 - D0  K-p+ , D0  K-p+ p0 , D0  K-p+ p-p+ • B0 D(*) -p+ •  D(*) -r+ •  D(*) -a1+ •  J/ K*0 Preliminary B0 257759B0 7517104 D*+l+ combinations PRELIMINARY

  3. Likelihood Fit to t Distribution hadronic B0sample PRELIMINARY hadronic sample semileptonic sample combined result

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