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In the BAD we do the following Evaluate B->semilep sys (using ONLY -b flag when submitting fit and Sys > 0) Evaluate D->Excl sys (using only -d flag when submitting fit and Sys >=2) Evaluate D->Incl sys (using only -d flag when submitting fit and Sys =1) And then we merge the B->semilep sys with the higher contribution from D->Excl or D->Incl . Alessio ______________________________________________________ Alessio Sarti Universita' & I.N.F.N. Ferrara >>>I'm in Frascati<<< Frasc +39-06-94032776 Fax +39-06-94032427 "... e a un Dio 'fatti il culo' non credere mai..." (F. De Andre') "He was turning over in his mind an intresting new concept in Thau-dimensional physics which unified time, space, magnetism, gravity and, for some reason, broccoli". (T. Pratchett: "Pyramids") On Tue, 27 Jan 2004, Kerstin Tackmann wrote: > > 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 > > >