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Reconstruct B 0 decay vertex using hadronic or semileptonic decay modes - PowerPoint PPT Presentation


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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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Presentation Transcript
slide1

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

slide2
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

likelihood fit to t distribution
Likelihood Fit to t Distribution

hadronic B0sample

PRELIMINARY

hadronic sample

semileptonic sample

combined result