# ms: semi-exclusive analyses (1)

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- ## fs ~ 10 % limits the reach of inclusive samples

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- ## 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 )

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