Hoi,
the determination of this involved a bit more than calculating the BF
in DECAY.DEC, since I was interested also in the JETSET ssbar popping
rates for the nonresonant MC.
In http://www.slac.stanford.edu/~ursl/talks/030603/ssbar.eps.gz you
can find the p* distribution of el and mu in all b2u events (top), in
b2u events without strangeness (middle) and in b2u events with
strangeness (bottom). The left column shows resonant production, the
right column non-resonant.
In resonant (non-resonant) b2u events the fraction of events with
strangeness is 0.120+/-0.004 (0.162+/-0.003). The error is statistical.
Cheers,
--U.
PS: The different shapes of these spectra ...
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