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