Hoi,
I counted KKbar pairs in the Xu system on an unbiased event sample,
obtained directly from EvtGen. My apparent problem in the
normalization turned out not to be a problem at all, but just physics.
The rate for ssbar popping in the nonresonant component in the hybrid
MC is different from the nonresonant MC.
Here are the numbers:
ssbar in % Dedicated MC Hybrid MC
--------------------------------------------------
B+ resonant 10.2 10.7
B+ nonresonant 7.3 12.0
B0 resonant 0.2 0.1
B0 nonresonant 7.1 11.3
"Dedicated" means that it's just the resonant (nonresonant) component,
no mixture between the two. If I run the "dedicated" nonresonant MC
with the same reweighting (for the non-resonant part) as the hybrid
MC, the dedicated and hybrid MC have ssbar popping rates compatible
within the stat. error.
The resonant numbers agree with Daniele's DECAY.DEC calculation within
the stat. error.
Cheers,
--U.
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