# md : lepton - Qjet

- Lepton on vertex side tags decay flavour
- Qjet (other jet) tags production flavour
- (Qjet) depends on Physics:
  B+ fraction, B decays, , D+/0 production ...
  * ALEPH, DELPHI : fit the data ( = Amplitude)
  stat up by ~ 30 %
  * OPAL: fine MC tuning
  syst ~ 0.009
- Results ( ps-1 ) (~ 70 Kevts/exp.)
  ALEPH(P) = 0.404 0.045 0.027
  DELPHI(P) = 0.493 0.042 0.027
  L3(P) = 0.471 0.077 0.016
  OPAL(P) = 0.444 0.029 0.0200.017
  CDF(P) = 0.467 0.057 0.035

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