 |
 |
Hi, we are looking at the data/MC comparison plots for release 18 (Michaels' presentation at the Feb07 CM, see: http://www.slac.stanford.edu/BFROOT/www/Organization/CollabMtgs/2007/detFeb07/Fri1c/sigamani.pdf and the same plots in BAD1383 made with release 14 http://www.slac.stanford.edu/babar-internal/BAD/doc/download? file=01383.003.ps All variables look reasonably similar (could you please double check this as well?) apart from wdeltam, i.e. the missing mass squared for the partial D*+ reconstruction, see e.g. p.12, left plots of Michaels' presentation and left plots of p.26 of BAD1383. In release 18 the distributions for both enriched and depleted samples extend to lower values wrt release 14 and the shapes are quite different. Has anyone seen this effect yet? We also compared the yields and BRBRs of our latest mX fits (the ones in Antonio's page http://www.slac.stanford.edu/~petrella/datafit/data.html ) and what we had in BAD1214, i.e. in the old mX study attempted in 2005 but not finalized since we did not have the signal unfolding for the 1D analysis at that time. In general they compare quite well. However, the amount of vcb events in release 18 is significantly higher wrt previous studies, compare e.g. the Run1-2 results for the mX fit at http://www.slac.stanford.edu/~petrella/tmp/scra/IbudatmxrewfitallR12/datmxrewfitallR12fitresults.eps with fig. 14 on page 25 of BAD1214: http://www.slac.stanford.edu/babar-internal/BAD/doc/download? file=01214.008.ps It seems that there is a cut which was quite effective in suppressing vcb events in release 14. This is not happening any more in release 18... Cheers, Antonio & Concezio.