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Hi Ric, Thanks for your last posting on misid. I have made the same plots as you and find similar results, see http://www.slac.stanford.edu/~henning/vcb/pionmisid.eps (these plots are taken from what I've shown on Monday) So we have a misid of up to 2% in the Brecoil depending on the momentum even when requiring GTL which is still a bit puzzling. I also find that 19,7% of the tracks above 1 GeV belong to the recoil, so we do agree here as well. Thanks again for your help. Cheers, Henning On Wed, 26 Mar 2003, Riccardo Faccini wrote: > Hi Oliver, > I have check your observation on misid. I have added the good track loose > selection to find back Urs's results. I show plots on 2000 generic B0. > The plot done on all tracks is > http://www.slac.stanford.edu/~rfaccini/phys/ISL/allgt.eps > I would say that I find back urs's result > > the correponding plot for only tracks on the recoil is > http://www.slac.stanford.edu/~rfaccini/phys/ISL/recoilgt.eps > > This misid is twice as big and this makes sense because we are making the > Breco candidate vetoing on electrons and muons. So the Breco tracks are > very unlikeli to be called electrons (some can because we are using a > different selector). So I do not see anything wird in this. The only > oddity is why we have a misid of ~1% on the recoil tracks, but the scaling > with "all tracks is clear ) > > Anyhow I find that 19% of the tracks above 1 GeV belong to the recoil. Do > you agree on the number?This fraction goes up to 50% if one removes the > cuts on momentum because the track from reco are stiffer by contruction. > > hope this helps > ciao > ric > P.S. the code I used is in ~rfaccini/myRoot/test.C at slac >