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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 ...