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> > Out of the 20k events, 11598 make it to the point that we even initialize > > a RecoilMCUtil for them. The 8402 others apparently have an empty Breco > > list (according to the eventCat histogram). Why does this actually happen? > > We are running over the SemiExclusive skim after all. Why does the skim > > write events with an empty Breco candidate list? > > Well, Daniele told me once that the requirements for the BReco candiates > in the skim are looser compared to the Best B selection we are using at > the ntuple level. If you really want to understand this you have to look > how the best be is selected. the cut on Delta_E is 120MeV at skim level while it is tighter when the best B selection (that is used by VubRecoilUser), i.e. up to 30MeV. Daniele