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> Hi all, > I've tried to investigate a bit more the effect of reweighting applied > from Urs. > The mean of energy spectrum (best KLongs selected with likelihood method), > after Urs rescaling is shifted of ~4% (I remind you that the 20% > reweigthing is applied only to TRUE KL (associator) while the energy > plotted here is referred to ALL the KL selected via the likelihhod method. > > The plots (Urs's files and old reweighted MC) are superimposed here: > http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/old_vs_new.eps > > This seems to be in disagreement with what shown here: > http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/true_vs_all.eps > some time ago. > I've tried to trace back the problem and seems to me that the > normalization of two plots was wrong. I don't know why but the fake and > true histos have ~ the same number of entries (768 vs 771): this is really > suspicious and seems to be an artifact of the histo produced by the > comparison routine instead of the really eff (50%) expected for our > selection. > > I've tried to recompute the efficiency of the idGam associator NOT by > looking at histograms but counting events. I'm still working on that > and tomorrow I'll have the eff numbers. Hi all, the net eff. that comes out directly from mes fit is: 11%. This means that the plot shown before had the wrong normalitazion being a root artifact: I apologize for that. What I do not understand is the shift in the mean of ~4% : applying a 22% correction to the energy to the 11% of the events I expect the mean to be shifted of ~2.4% ..... Probably we need to rerun dumping the idGam of the best kl redoing the exercise on urs's files... alessio > > I can't calculate such eff. in Urs's produced files (the idGam for best KL > has not been dumped): if we want to perform the same study I need to > rerun against the MC and dump the idGam of best KL neutral. > > Cheers, > Alessio > > ______________________________________________________ > Alessio Sarti Universita' & I.N.F.N. Ferrara > > >>>I'm in Ferrara<<< > > tel +39-0532-974328 Ferrara > roma +39-06-49914338 > SLAC +001-650-926-2972 > >