Hi all, these are the numbers for the new calculation of the pstar factor. I used: - all the available MC (cocktail+vubcocktail+generic+vubgeneric) - a loose cut on the purity (intpur>.2, quite similar to the analysis one) - exactly the same cuts of the selection of the semileptonic events (to get Nsl) and mixing correction I did it both for electrons and muons, since the efficiency vs pstar convoluted with different spectra can produce different ratios of efficiencies. Here the numbers e+mu ---- pcms > 1.0 PSTAR FACTOR = 1.1271 +- 0.0106366 pcms > 1.1 PSTAR FACTOR = 1.1591 +- 0.0115223 pcms > 1.2 PSTAR FACTOR = 1.21073 +- 0.0126872 pcms > 1.3 PSTAR FACTOR = 1.27754 +- 0.0142094 pcms > 1.4 PSTAR FACTOR = 1.37362 +- 0.0162895 pcms > 1.5 PSTAR FACTOR = 1.50655 +- 0.0191914 pcms > 1.6 PSTAR FACTOR = 1.68092 +- 0.023273 pcms > 1.7 PSTAR FACTOR = 1.93272 +- 0.0294956 pcms > 1.8 PSTAR FACTOR = 2.3702 +- 0.0401761 pcms > 1.9 PSTAR FACTOR = 3.13499 +- 0.0599656 pcms > 2.0 PSTAR FACTOR = 4.69766 +- 0.104218 ele --- pcms > 1.0 PSTAR FACTOR = 1.11579 +- 0.0163298 pcms > 1.1 PSTAR FACTOR = 1.14532 +- 0.0175532 pcms > 1.2 PSTAR FACTOR = 1.20296 +- 0.0192487 pcms > 1.3 PSTAR FACTOR = 1.27156 +- 0.0214447 pcms > 1.4 PSTAR FACTOR = 1.3718 +- 0.0244644 pcms > 1.5 PSTAR FACTOR = 1.50515 +- 0.0286845 pcms > 1.6 PSTAR FACTOR = 1.68578 +- 0.0345991 pcms > 1.7 PSTAR FACTOR = 1.94961 +- 0.0436818 pcms > 1.8 PSTAR FACTOR = 2.39972 +- 0.0593268 pcms > 1.9 PSTAR FACTOR = 3.2157 +- 0.0890321 pcms > 2.0 PSTAR FACTOR = 4.8212 +- 0.153699 mu -- pcms > 1.0 PSTAR FACTOR = 1.14345 +- 0.0207069 pcms > 1.1 PSTAR FACTOR = 1.17861 +- 0.0218576 pcms > 1.2 PSTAR FACTOR = 1.22121 +- 0.0233736 pcms > 1.3 PSTAR FACTOR = 1.28554 +- 0.0254447 pcms > 1.4 PSTAR FACTOR = 1.37616 +- 0.0283582 pcms > 1.5 PSTAR FACTOR = 1.50935 +- 0.0324935 pcms > 1.6 PSTAR FACTOR = 1.67632 +- 0.038304 pcms > 1.7 PSTAR FACTOR = 1.91484 +- 0.0471119 pcms > 1.8 PSTAR FACTOR = 2.33777 +- 0.0624082 pcms > 1.9 PSTAR FACTOR = 3.05161 +- 0.0900003 pcms > 2.0 PSTAR FACTOR = 4.57164 +- 0.153355 These are the slopes: ele+mu: http://www.slac.stanford.edu/~daniele/vub/psf_2.ps ele: http://www.slac.stanford.edu/~daniele/vub/psf_0.eps mu: http://www.slac.stanford.edu/~daniele/vub/psf_1.eps I checked also which is the result using generic MC only with the same purity cut: pcms > 1 PSTAR FACTOR = 1.15463 +- 0.0184315 pcms > 1.1 PSTAR FACTOR = 1.18811 +- 0.0199061 pcms > 1.2 PSTAR FACTOR = 1.24495 +- 0.0218892 pcms > 1.3 PSTAR FACTOR = 1.30573 +- 0.0243927 pcms > 1.4 PSTAR FACTOR = 1.40049 +- 0.0277886 pcms > 1.5 PSTAR FACTOR = 1.5291 +- 0.0327194 pcms > 1.6 PSTAR FACTOR = 1.70505 +- 0.0395539 pcms > 1.7 PSTAR FACTOR = 1.94847 +- 0.0497028 pcms > 1.8 PSTAR FACTOR = 2.40148 +- 0.0677054 pcms > 1.9 PSTAR FACTOR = 3.15595 +- 0.100252 pcms > 2 PSTAR FACTOR = 4.62101 +- 0.169268 The results are compatible within the stat error. In principle the number on the genric can be affected by sist effects due to low purity fits. Our new pstarfactors will be: tot: pcms > 1.0 PSTAR FACTOR = 1.1271 +- 0.0106366 ele: pcms > 1.0 PSTAR FACTOR = 1.11579 +- 0.0163298 mu: pcms > 1.0 PSTAR FACTOR = 1.14345 +- 0.0207069 I updated the code to use these factors dependent on the lepton type. Daniele