ms: semi-exclusive analyses (1)
fs ~ 10 % limits the reach of inclusive samples
Bs Ds+ (l - ) X
- low statistics + high purity Bs sample
- Semileptonic mode (ALEPH,DELPHI,OPAL)
~ 150 - 300 evts./exp.
Bs fraction ~ 60 %
best proper time determination
- Ds+ - hadrons (ALEPH):
~ 1500 evts.
fs’ ~ 24 %
(30 % comb., 20 % cc )