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Vub measurement using recoil of fully reconstructed Bs

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From:
Urs Langenegger <[log in to unmask]>
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Date:
03 Jul 2002 01:09:45 -0700Wed, 03 Jul 2002 01:09:45 -0700
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I obviously forgot the charged track multiplicity: 

Lepton cut only: 
 http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a4020.eps.gz
All cuts: 
 http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a4000.eps.gz

Cheers,
--U.


 > 
 > Hoi,
 > 
 > the trk  killing was implemented with the  Daniele's tables, contained
 > in IslBrecoilUser/tablechg.dat, giving the ratio data/MC.
 > 
 > In momentum intervals with an  'efficiency' larger than 1, tracks were
 > killed in data.  In the  following, the usual plots are inverted: what
 > is labelled  as data is actually  generic MC, and  the histograms show
 > the killed and default data distributions.
 > 
 > The track momentum spectrum is well reproduced by this procedure on
 > the lepton-cut only sample: 
 >   http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a1600.eps.gz
 > 
 > There are  residual differences (and  fluctuations in data)  after all
 > cuts:
 >   http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a1610.eps.gz
 > 
 > This is a  bit surprising, I'd have thought that  the tables are after
 > all cuts.
 > 
 > The  effects of trk  killing are  clearly visible  in the  (fitted and
 > reco)  MX  distribution,  which  is systematically  shifted  to  lower
 > values:
 >   http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a2420.eps.gz
 > 
 > The agreement between data and MC is better for the unkilled version. 
 > 
 > The charged Trk multiplicity is affected, especially after the lepton
 > cut: 
 >   http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a4300.eps.gz
 >   http://www.slac.stanford.edu/~ursl/talks/070202/trkkill-a4320.eps.gz
 > 
 > The default setup shows better agreement. 
 > 
 > Note: These plots are a bit different from the BAD, this is due to the
 > fact that the BAD plots were made with the veryTight muon selector and
 > these here with tight.
 > 
 > So, technically, I think there no obvious problem with the TrkKilling.
 > 
 > The fits give: 
 > 
 >   Default: BRBR = 0.0167335 +- 0.00446966(stat) +- 0.00127934(MC stat)
 >   TrkKill: BRBR = 0.0218932 +- 0.00459749(stat) +- 0.00124435(MC stat)
 > 
 > This is  a difference of 31%.  Given the level of  disagreement in the
 > above distributions, I  would not say that it's a  good estimate for a
 > systematic. More thinking is required. 
 > 
 > 
 > Cheers,
 > --U.
 > 
 > 



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