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Hi all, today I've run again two fit tests, one with the ratio signal/peaking bkg fixed (only on data, this time) and one without fixing the ratio. Results can be found here: http://www.slac.stanford.edu/~petrella/tmp/scra/Ibutest_fixed/ http://www.slac.stanford.edu/~petrella/tmp/scra/Ibutest_SUN/ General comments: -comparing the right lower plot (which contains the sum of Bch and B0 for data) http://www.slac.stanford.edu/~petrella/tmp/scra/Ibutest_fixed/test_fixeddatachop_all-1.eps http://www.slac.stanford.edu/~petrella/tmp/scra/Ibutest_SUN/test_SUNdatachop_all-1.eps we see that the effect of fixing the ratio is to increase the distribution in the low mx region ( 1.55 < mx < 2.1) and to decrease in the high mx region (mx > 2.8 ). So we looked with more attention to fits performed bin by bin to compute the correction factor and...: - the fit in the high mx region for MC depleted has peaking background consistent with 0 http://www.slac.stanford.edu/~petrella/tmp/AWG38/depleted/MCsameEND/MCfit_1D_3.103.40.eps http://www.slac.stanford.edu/~petrella/tmp/AWG38/depleted/MCsameEND/MCfit_1D_3.403.70.eps moreover in the Enriched MC the signal and the peaking components are swapped for 3.1 < mx < 3.4! http://www.slac.stanford.edu/~petrella/tmp/AWG38/enriched/MC/MC_enrich_1D_3.103.40.eps - in the low mx region the increase in the mx distribution is due to the behaviour of the double ratio (sig/peak)_DATA/(sig/peak)_MC, where the numerator and denominator go in the opposite direction i.e.: for MC the ratio is small while for data is high, so the net effect of the double ratio is to give a high correction. But fits on MC present clearly some problems: look at http://www.slac.stanford.edu/~petrella/tmp/AWG38/depleted/MCsameEND/MCfit_1D_1.551.90.eps http://www.slac.stanford.edu/~petrella/tmp/AWG38/depleted/MCsameEND/MCfit_1D_1.902.20.eps So I don't think we can trust 100% the numbers used to compute the correction so far. Antonio