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Hi Concezio and Antonio, the data-MC comparison only tells us about shapes. It might be useful to also look at efficiencies for the K veto and the D* partial reco veto. Just by eye without having any numbers to back this up I already noticed that the S/B in the mX distributions seems worse than what we had on Run1+2. Cheers, Kerstin > Hi, > we are looking at the data/MC comparison plots for release 18 (Michaels' > presentation at the Feb07 CM, see: > > http://www.slac.stanford.edu/BFROOT/www/Organization/CollabMtgs/2007/detFeb07/Fri1c/sigamani.pdf > > and the same plots in BAD1383 made with release 14 > > http://www.slac.stanford.edu/babar-internal/BAD/doc/download? > file=01383.003.ps > > All variables look reasonably similar (could you please double check > this as well?) apart from wdeltam, i.e. the missing mass squared for the > partial D*+ reconstruction, see e.g. p.12, left plots of Michaels' > presentation and left plots of p.26 of BAD1383. In release 18 the > distributions for both enriched and depleted samples extend to lower > values wrt release 14 and the shapes are quite different. Has anyone > seen this effect yet? > > We also compared the yields and BRBRs of our latest mX fits (the ones in > Antonio's page > > http://www.slac.stanford.edu/~petrella/datafit/data.html > > ) and what we had in BAD1214, i.e. in the old mX study attempted in 2005 > but not finalized since we did not have the signal unfolding for the 1D > analysis at that time. In general they compare quite well. However, the > amount of vcb events in release 18 is significantly higher wrt previous > studies, compare e.g. the Run1-2 results for the mX fit at > > http://www.slac.stanford.edu/~petrella/tmp/scra/IbudatmxrewfitallR12/datmxrewfitallR12fitresults.eps > > with fig. 14 on page 25 of BAD1214: > http://www.slac.stanford.edu/babar-internal/BAD/doc/download? > file=01214.008.ps > > It seems that there is a cut which was quite effective in suppressing > vcb events in release 14. This is not happening any more in release > 18... > > Cheers, Antonio & Concezio. > >