# md : D*+ l -

##

- ## Exploit B0 D* l decays

- ## Small , well controlled Physical Background

  - small systematic error

- ## Statistical Limitation (B.R.* D* reconstruction )

  - CDF : high bb rates @ Tevatron
  - DELPHI: inclusive l * ( ~ 4500 evts., f’d ~ 85 %)
    (see “B lifetimes” by V.Papadimitriou)

- ## Results

  CDF(P) = 0.446 0.057 0.034 0.031
  DELPHI(P) = 0.499 0.053 0.015 smallest syst.
  OPAL = 0.567 0.089 0.029 0.023

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