Hi Daniele,
this is not what shown in our Vub conf papers where the purity of the mes
plots is by eye almost a factor 2 worse than BAD976.
Do you agree?
ciao
ric
______________________________________________________
Riccardo Faccini
BaBar Physics Analysis Coordinator
SLAC | Universita' "La Sapienza" & I.N.F.N. Roma
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On Wed, 26 Oct 2005, Daniele del Re wrote:
>
> Hir Henning,
>
> > I have a question concerning the change of Breco purity when moving from
> > SP4/rel.10 (most of the run1-2 analyses) to SP6/rel.14 (run1-4).
> >
> > Do you see a reduction in purity with the newer reconstruction release in
> > both data and MC?
> > And can you possibly quantify it?
>
> the purity with no DE cut should be improved since the skim rate went from
> 4% to 1.5% on data. Once you apply the mode dependent deltaE cut you
> should get a similar purity compared to rel 10 (probably slightly worse).
> Which machinery are you using to produce ntuples and to select the best B?
>
> > Similarily for the yield, I guess this is higher per fb-1 for the new
> > release but does someone have some numbers?
>
> there should be an increase of around 15-20%.
>
> > I expect you only have these numbers for events with an identified lepton
> > and not for all Breco candidates, but this would already help.
>
> for a per mode comparison (no cut) you can compare the tables in
>
> http://www.slac.stanford.edu/~daniele/breco/temp/sxModes-{2,3,4,5}.html
> for run1-4 rel14
> with
> http://www.slac.stanford.edu/BFROOT/www/Physics/Analysis/AWG/InclusiveSL/islrecoil/data0909_80fb-1/sxModes-{2,3,4,5}.html
> for 80 fb-1 rel10
>
> > For the Breco b->sg analysis we see a higher (BB) background i.e. reduced
> > purity and would like to better understand this.
>
> the lower purity can be due to just few new modes that were not present in
> rel 10 (because of the new tables). If they bother a lot you can identify
> them and cut them out.
>
> Daniele
>
