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Hi Urs, are you nor,alizing the hybrid numbers for the non resonant part to just the non resonant integral? If yes you should take into account that the fraction of ssbar events will be higher since they are mostly at very masses. Daniele On Tue, 18 Mar 2003, Urs Langenegger wrote: > > 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. >