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Hi Kerstin, I have not read the details of your posting yet. There is seomthing where we might have an inconsistency: I assume you are using the ratio other/vcb from the fit on data concezio has performed, right? If so, one needs to determine this ratio separately for the SP5 and Sp6 period first, right? cHEERS, hEIKO On Tue, 18 Jul 2006, Kerstin Tackmann wrote: > > Hi all, > > here are the results from the tests concerning the differences in the D** > modeling we talked about this morning. This is done with Concezio's recent > VVF tag and the correction factors are picked up from > corrratiosigpeakmx_newdatadepl.txt. The D** are moved into the "other" > component (-fitdss 1). > > Please find the plots here: > http://costard.lbl.gov/~kerstin/vubunf/testdss_Run12fitresults.eps > http://costard.lbl.gov/~kerstin/vubunf/testdss_Run4fitresults.eps > > By eye, the fits do look different and here are some numbers: > > **Fit on Run 1+2, SP5: > chi2/ndof = 1.64116 (for 7 dof) > ratio other/vcb = 0.296045 / 0.287339 = 1.03 +- 0.17 > (with errors: > Vcb comp = 0.287339 +- 0.0183957 > Oth comp = 0.296045 +- 0.0442523) > > **Fit on Run 4, SP6: > chi2/ndof = 1.90748 (for 7 dof) > ratio other/vcb = 0.117799 / 0.141224 = 0.83 +- 0.13 > (with errors: > Vcb comp = 0.141224 +- 0.00785652 > Oth comp = 0.117799 +- 0.0174853) > > where vcb is D and D*, other is D** and the non-sl bkgd. > > The differences might or might not be from the D** - roughly, in SP6 we > would think that the D** should smear down to smaller masses (since > some widths are larger and the minimum masses, with which D** can be > produced can be lower). We subtract less "other" and still the data > spectrum has fewer entries in the bins around 2GeV (and the D** do > smear this far down). > > > Here is another observation from these fits: > > Run 1+2, SP5, numbers of events in the first mX bin: > Data 1' bin = 393.016 +- 26.1089 > Vub 1' bin = 1809.31 +- 45.3825 > Vcb 1' bin = 482.67 +- 22.7482 > Oth 1' bin = 73.6857 +- 9.62637 > > Run 4, SP6, numbers of events in the first mX bin: > Data 1' bin = 436.967 +- 27.2767 > Vub 1' bin = 1528.4 +- 41.7351 > Vcb 1' bin = 1327.69 +- 37.7632 > Oth 1' bin = 186.534 +- 14.9827 > > after the mES fit... compare the number of data events (quite similar) > and the number of Vcb events (quite different). As far as I know there is > no SP5/SP6 weight on the generic MC. In the case that we think > efficiencies might be sensitive to the run period, this looks like a > potential problem, doesn't it? And taking Run 3 into account, this looks > even worse. I am confused - I thought we were supposed to have SP5 and SP6 > roughly in the ratio of Run1-3 to Run4. And if this is true before any > cuts and bkgd subtraction, it probably should not be vastly different > afterwards. > > Cheers, > Kerstin > > > >