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Hi Alessio, > Concerning the Sys variable, this is how we use it now: > if you set Sys = 0 The branching ratios are reweighted to their default > (PDG) values (of course you should have set the -d and -b flags in your > executable). > If you use the Sys =1 you reweight the B branching fractions with a random > BR extracted with a gaussian probability with mean and sigma from PDG and > you reweight the inclusive D->K BR again with gaussian probability with > mean and sigma from PDG. > > If you use Sys =2 you reweight the B branching fraction as for Sys = 1, > but you reweight the D decays in the exclusive way (every BR is extracted > in gaussian way with sigma and mean from PDG). > > For Sys > 2 you use basically the method for Sys =2 but with changing seed > (to have multiple variations and study a distribution). > > Let me know if everything is clear or if there are still questions... Thanks a lot for the explanation. What is the way you are actually using it then? According to the BAD the uncertainty for the D->K fraction is considered separately from the B->D fractions (p.83). The above sounds to me as if you are evaluating them together, though. (As if every time you flucuate the B->D fractions, you in some way fluactuate the D->K fractions as well.) What Sys option should I actually use to get the error related to the B->D fractions (all seem to also fluctuate the D->K as well??) ? Thanks, Kerstin