# md : SLD

- Beam Polarisation + P in Z decays
  - b ( b ) produced mostly forward (backward) wrt e- beam
  - cos( ) jet precise + efficient flavour @ production
    < > ~ 75-80 % (+ Qjet ~ 80-85% )
    < > ~ 100 % S ~ 0.7
- Tagging compensates Statistics (~1/20 wrt LEP)
- Decay flavour: l , K , vertex charge dipole
  SLD preliminary result:
  md = 0.525 0.057 ps -1

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