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Hi all, as a sanity check I performed some studies on the ratio of semileptonic efficiencies (pstartfact). I used cocktail MC. These are the pcms distribution once you apply the lepton cut for vub and vcb events: http://www.slac.stanford.edu/~daniele/vub/allept/pcmslepvubandvcb.eps and this is the lepton efficiency http://www.slac.stanford.edu/~daniele/vub/allept/effpcmslepvubandvcb.eps This plot is very nice and encouraging since, as you see, the efficiencyies are identical once you take the full spectrum and the value is ~60% that makes a lot of sense. A pstarfactor != 1 is only due to the cut on momentum. As you can see in http://www.slac.stanford.edu/~daniele/vub/allept/ratioeff.eps that shows the ratio of the efficiencies With 1.0 GeV cut we get the famous 1.13 value and the ratio change dramatically as a function of the cut. This shape is perfectly compatible with the value calculated by the fit http://www.slac.stanford.edu/~daniele/vub/newscans/all/lastpcmsdataleptonPCutpstarfact.eps Then I conclude that everything is understood and under control in these plots. The only suspicious number in the fit is the total number of vub/vcb events (but it does not seem to affect the ratio calculation). I am checking it. Daniele