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Vub measurement using recoil of fully reconstructed Bs

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Subject:
From:
Daniele del Re <[log in to unmask]>
Date:
19 Feb 2003 03:53:40 -0800 (PST)Wed, 19 Feb 2003 03:53:40 -0800 (PST)
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done

On Wed, 19 Feb 2003, Riccardo Faccini wrote:

> Ciao Daniele,
> could you post this in the review-HN in order to accelerate the review
> process?
> 	thanks
> 	ric
>
> On Wed, 19 Feb 2003, Daniele del Re wrote:
>
> >
> > Hi all,
> >
> >  as discussed at the meeting I performed the systematics due to the
> > exclusive b->ulnu BRs varying separately the pilnu and the rholnu
> > contributions instead of varying all the exclusive components of the same
> > relative amount.
> >
> >  These are the results:
> >
> >    test                                                BRBR
> >
> >  BR(B0->pi+lnu) +30% && BR(B+->pi0lnu) +30%           - 1.7%
> >
> >  BR(B0->pi+lnu) -30% && BR(B+->pi0lnu) -30%           + 2.0%
> >
> >  BR(B0->rho+lnu) +30% && BR(B+->rho0,omegalnu) +30%   - 0.5%
> >
> >  BR(B0->rho+lnu) -30% && BR(B+->rho0,omegalnu) -30%   + 0.8%
> >
> >  BR(B->pilnu) +30% && BR(B->rholnu) +30%              - 2.5%
> >
> >  BR(B->pilnu) -30% && BR(B->rholnu) -30%              - 2.8%
> >
> >
> >   as a crosscheck I tried to remove all the remaining exclusive compenent
> > (not yet observed decay modes)
> >
> >  BR(B->Xlnu (not pi and rho)  -100%                   - 5.8%
> >
> >
> >  and it seems to go in the opposite direction but explanes why the
> > hybrid and the non resonant model give then similar results (something
> > like a compensation). Quoting this difference as systematics probably
> > would be too conservative since it implies that we don't use at the
> > theoretical information about eta, eta' , a1, b1 , f1 lnu decays.
> >
> >
> >  I propose to quote a simmetric syst uncertainty of 2.6%. Together with
> > the systematics due to the fit using the pure non resonant model it gives
> > us a systematics of ~4% that would be conservative.
> >
> >
> >  Daniele
> >
> >
> >
> >
> >
>



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