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Vub measurement using recoil of fully reconstructed Bs

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From:
Alessio Sarti <[log in to unmask]>
Date:
18 Mar 2003 03:41:55 -0800 (PST)Tue, 18 Mar 2003 03:41:55 -0800 (PST)
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Hi,
The updated plot of released _true-KL_ energy has been updated:
http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/ReleasedEn.eps

Do we want such plot committed in the VubAnalysis package?

Cheers,
alessio
______________________________________________________
Alessio Sarti     Universita' & I.N.F.N. Ferrara

>>>I'm in Ferrara<<<

 tel  +39-0532-974328  Ferrara
roma  +39-06-49914338
SLAC +001-650-926-2972

"... e a un Dio 'fatti il culo' non credere mai..."
(F. De Andre')

"He was turning over in his mind an intresting new concept in
Thau-dimensional physics which unified time, space, magnetism, gravity
and, for some reason, broccoli".  (T. Pratchett: "Pyramids")

On Mon, 17 Mar 2003, Alessio Sarti wrote:

> Hi all,
> I've finished the last tests that were requested before running the full
> sys study.
> I've produced:
> 1) True KL true energy spectrum:
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/energyTrueKL.eps
>
> 2) True KL calorimeter energy deposit spectrum:
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/ReleasedEn.eps
> (I'm redoind ig on the full generic MC sample with a proper X scale :)..)
>
> 4) MC energy spectra of KL selected on 'control sample (PRMM2>-3)' with a
> likelihood cut (likelihood>0), enriched region:
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/true_vs_all.eps
> In red are shown the candidates that are TRUE KL (the fraction is decent:
> the associator and the likelihood method results are in reasonable
> agreement)
>
> 3) Data-MC comparison for TRUE and FAKE MC KL (were true or fake is
> dictated by the MC associator):
> true:
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/trukl/comparison5mxminpileptoncuts.ps
> fake:
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/fakekl/comparison5mxminpileptoncuts.ps
>
> Given that almost all the KL < 200 MeV are 'FAKE' I have tried to
> re-estimate the correction that comes from just events with KL > 200 MeV.
>
> Data MC comparison is shown in:
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/CUT/comparison5mxminpileptoncuts.ps
> and the correction comes out to be ~1 (no correction).
>
> In order to be conservative I porpose to use the correction that comes
> from the study with the full KL sample (correction ~1.22).
>
> ***********Implementation*************
>
> Now that Urs need to rerun anaQa in order to estimate the sys I propose
> to add (in the loop that creates the four vectors of neutral particles in
> 'recoil' subroutine)  the following piece of code:
>
>     if( idGam[i] == 130 ){
>         energyGam[i] *= (0.274351/0.225545);
>     }
>
> just before any manipulation of that quantity.
> That should be enough.
>
> Let me know if that is enough or if any further check is needed.
> alessio
>
> ______________________________________________________
> Alessio Sarti     Universita' & I.N.F.N. Ferrara
>
> >>>I'm in Ferrara<<<
>
>  tel  +39-0532-974328  Ferrara
> roma  +39-06-49914338
> SLAC +001-650-926-2972
>
> "... e a un Dio 'fatti il culo' non credere mai..."
> (F. De Andre')
>
> "He was turning over in his mind an intresting new concept in
> Thau-dimensional physics which unified time, space, magnetism, gravity
> and, for some reason, broccoli".  (T. Pratchett: "Pyramids")
>



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