B flavour tagging
- Lepton Charge ( b l -X)
Dilution :
* b c l+X , fake leptons
* cut P, Pt
~ 75-85 % ~ 5-10 % S ~ 16 %
- Jet Charge
Qjet = ~ Qb quark
~ 65-70 % ~ 70 % S ~ 25 %
- D*+ (+ l), Ds+ (+ l)
low efficiency but Bd(Bs) enrichment
- Charge of fragmentation K+ (Bs)
- SLD: b Polarisation Asymmetry