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> > > > I then looked at a possible bias of the b-reconstruction > > and I actually found a strong dependence of the mean value of mxhadgen > > with the purity of the mode: > > http://www.slac.stanford.edu/~rfaccini/phys/vub/theo/mxgenpur.eps > > (note that at generator level <mxhad>=1.45). This means that the mes > > sidebands are dominated by high mx states, which makes sense because of > > combinatorics. > > this was known (combinatorics depends on multiplicity of the recoil) > In calculating weights alessio is doing sideband subtraction and then we > should be ok. > > > 1) when looking at the generator level mx we need to make sideband > > subtraction (this might have been obvious to you, but not to me ...) > > Does anybody have a sideband sub distribution of mxhadgen before any cut > > so that I can test the generator? > > I don't have it available. You should redo by yourself. Otherwise > use cocktail, MC put a hard cut on the purity and cut on mes>5.27. This > should be a reasonable compromise. > > > 2) are we computing the weights on the sideband subtracted or the raw > > events? Are we scaling to the #of generic with or without sideband > > subtraction? I would like to double check the logic of this process > > because it can be delicate ... you can make any test that you can think of byt I can say that all the steps are done at sideband subtracted level. Weights and scaling factors are all computed after mes fits.... ciao, Alessio > > see above. alessio's code in committed in CVS (in VubAnalysis). you can > look at it, if you like. In principle he should be doing right. > > Daniele > > > > 3) I am afraid we have to redo the weights at generator level in order to > > be sure , also given the brehmstrahlung business > > > > ciao > > ric > > >