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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.