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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. 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