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Vub measurement using recoil of fully reconstructed Bs

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From:
Riccardo Faccini <[log in to unmask]>
Date:
11 Mar 2003 12:05:32 -0800 (PST)Tue, 11 Mar 2003 12:05:32 -0800 (PST)
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Ciao Alessio,

> Hi all,
> here's some material for today's meeting:
>
> 1)I've tried to play a bit with Kl stuff.
> Thos are three data-MC comparisons for the energy of those neutrals that
> have the largest likelihood to be Kl:
>
> ..as it is (no correction applied)
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/nu/comparison5mxminpileptoncuts.ps
>
> applying a correction (on MC)::
> newE(g) = E(g)*(mean_data(enr.)/mean_MC(enr.))
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/nurewsh/comparison5mxminpileptoncuts.ps
>
> applying a correction (on MC)::
> newE(g) = E(g)+(mean_data(enr.)-mean_MC(enr.))
> http://www.slac.stanford.edu/~asarti/recoil/devel/KLstu/nurewsh/comparison5mxminpileptoncuts.ps
>
> The first correction  method seems more powerful
> than the second one:
> there are suggestions for different correction procedures?

I would say that since this is a systematic study the fact that the
correction seems to overkill a bit just means that we would be
conservative. I would chose the multiplicative one.

>
> Once we agree on wich correction we need to use to reweight
> our MC I'll prepare the anaRecoil code in such a way that
> the energy of those neutrals that have a KL likelihood > 0
>
>    energyGam[i] *= f(corr_factor);
>
> can be corrected for the given factor and Urs/whoever else
> can rerun the analysis rootfile production.

I don't this is what we should do. I think we should find the candidates
that are KL at MC truth level and rescale those.
	bye
	ric



>
> 2)I've played a bit with the m_b mass that can be extracted by
> our datasample and here's the output of my very firt study:
> http://www.slac.stanford.edu/~asarti/recoil/myThesis/mbmeas.html
>
> Are you going to call me in Ferrara?
> 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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