Hi, just a quick reminder: we are calculating S/P correction for data enriched using this formula: S/P_MC ENRICHED S/P_DATA_ENRICHED= ------------------ * S/P_DATA DEPLETED S/P_MC DEPLETED The set of corrections we have determined so far has been computed on mes fits with Crystal Ball Shape parameters fixed to MC Enriched Sample, and also signal function with parameters determined on enriched Sample. This set of correction has posted some days ago. #mx_l mx_h corr err_corr 0.00 1.55 1.499 +- 0.495 1.55 1.90 2.688 +- 0.655 1.90 2.20 1.801 +- 0.296 2.20 2.50 1.896 +- 0.611 2.50 2.80 1.165 +- 0.468 2.80 3.10 0.637 +- 0.311 3.10 3.40 19.367+- 34.585 3.40 3.70 1.524 +- 1.610 3.70 4.20 8.180 +- 31.833 4.20 5.00 0.555 +- 6.639 In order to find a better set of correction factors, to fix the huge errors on bin 3.10 < mX < 3.40 and 3.70 < mX < 4.20, I have tried the following: - determine the PDF parameters on MC-enriched sample with lepton cut and use them to fit MC-enriched sample ALL CUTS; - determine the PDF parameters on MC-Depleted with lepton cut and use them to fit MC-depleted sample ALL CUTS and data-depleted ALL CUTS. - both set of parameters have been determined by fitting non truth-matched events for bkg and counting truth-matched events for signal. - when fitting the mes distribution in kinematic bins for MC bkg all parameters have been kept fixed except for argus shape; - when fitting the mes distribution in kinematic bins for data depleted all parameters have been kept fixed except for argus shape, cutoff (CCB and Argus), SigmaL and sigma_r1 (fixed only when the number of events under the peak is < 1000); So here are the results: S/P MC DEPLETED ALL CUTS 4.47 +- 0.37 4.82 +- 0.17 4.2 +- 0.13 3.55 +- 0.19 3.33 +- 0.25 3.72 +- 0.42 4.37 +- 0.74 3.11 +- 0.51 4.63 +- 1.37 18 +- 68.43 S/P MC ENRICHED ALL CUTS 4.64 +- 0.34 4.05 +- 0.23 3.45 +- 0.25 3.28 +- 0.37 3.2 +- 0.45 3.32 +- 0.62 3.93 +- 1.09 3.33 +- 1.01 5.45 +- 3.89 -2.33 +- -4.32 Double Ratio S/P Mcenr/MCdepl 1.04 +- 0.11 0.84 +- 0.06 0.82 +- 0.06 0.92 +- 0.11 0.96 +- 0.15 0.89 +- 0.2 0.9 +- 0.29 1.07 +- 0.37 1.18 +- 0.91 -0.13 +- -0.55 S/P DATA DEPLETED ALL CUTS 2.23 +- 0.73 7.86 +- 2.73 4.62 +- 0.99 2.85 +- 0.94 3.41 +- 2.22 1.31 +- 0.66 1.33 +- 1.09 1.72 +- 1.62 -2.38 +- -3.8 -0.76 +- -0.81 For data depleted in this case the situation has worsened since the second bin has again a S/P which is very large wrt near bins. So the overall correction is OVERALL CORRECTION 2.32 +- 0.15 6.6 +- 0.05 3.8 +- 0.06 2.63 +- 0.13 3.27 +- 0.21 1.17 +- 0.47 1.2 +- 0.74 1.84 +- 0.54 -2.8 +- -0.64 0.1 +- 44.58 Now we don't have large errors for high mx bins, (except for the last one), but the correction factor is very high for the second bin. We have also tried to fit data depleted All cuts without any kinematic cut. In this case the ratio S/P is ~ 3. So we have tried to set as starting value for ccb yields and signal yields this ratio when fitting on kinematic bins, but the fit results did not change. Attached there is the spreadsheet with these results. any suggestions? Ciao Antonio & Concezio