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Hi all, after debugging the code (now I know that's impossible to have the duplicates killing and the fit running at the same time) now there's a new tag where the reweighting has been implemented and it's working: ale-06082002 Attention to the fact that also the recoilDSys has changed: a bug fix and some modification in order to fix BRs to PDG values has been implemented. With the -Sys option you can switch on the 'random' reweighting: BR are fixed to a random value extracted accordingly to a gaussian distribution with mean and sigma from PDG. With -Rew option you simply fix the BR values to the PDG ones. The weight to apply to each vcb event is calculated as the product of the weights for B->semil decays and for D-> decays. In this way we have B->D*lnu (only weight from B) = wB B->Dlnu (weight from B * weight from D) = wB*wD This whole procedure has to be tested and checked for bugs (correct values for all BR, correct implementation of reweighting). Let me know any comment or question. Cheers, Alessio ______________________________________________________ Alessio Sarti Universita' & I.N.F.N. Ferrara tel +39-0532-781928 Ferrara roma +39-06-49914338 SLAC +001-650-926-2972 "Vorrei tanto sapere chi e' che va in giro a costruire quadrati sull'ipotenusa"