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Hi, the optimization is here (for B0) http://www.slac.stanford.edu/~daniele/vub/prmm2geneB0prmm2cutopt.eps and it says -3 as the best cut but probably we need higher statistics to avoid statistical fluctuations (the cocktail was not yet available). In general the improvement in the error is around 15-20%. Daniele On Mon, 20 Jan 2003, Riccardo Faccini wrote: > Daniele and I have been trying out the proposal from Franz ( > http://babar-hn.slac.stanford.edu:5090/HyperNews/get/pubboard54/26/1/1.html > ) to discriminate B0->D*lnu events with the same variable used in the > partial reco analysises (see for istance BAD #287). > > This variable (called prmm2 in the following and peaked at 0 for D*lnu > events ) seems to be quite powerful: the comparison between Vub and Vcb > events on B0 is shown in > http://www.slac.stanford.edu/~rfaccini/phys/vub/deltam/comparison7wdeltamallcuts-sig.ps > (histo == Vcb) > The corresponding plots for charged Bs show that the signal at 0 is > genuine: > http://www.slac.stanford.edu/~rfaccini/phys/vub/deltam/comparison7wdeltamallcuts-sigbch.ps > > The data-MC agreement on B0, shown in > http://www.slac.stanford.edu/~rfaccini/phys/vub/deltam/comparison7wdeltamallcuts.ps > ,is quite good, > > The effect of a cut at prmm2<-2. GeV^2 on the Mx scan for B0 events (the > cut would be applied only to them) is shown in > http://www.slac.stanford.edu/~rfaccini/phys/vub/deltam/prmm2effect.eps > (open dots after the cut, full dots, before). > The effect of the cut is clearly beneficial, the slope being reduced ~40%. > It is amazing that our analysis is sitting in the only stable point. > > > Daniele is performing the scan of this variable and the optimization. The > final cut is more likely to be ~4GeV^2 > > ciao > ric > >