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Vub measurement using recoil of fully reconstructed Bs

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Subject:
From:
Riccardo Faccini <[log in to unmask]>
Date:
16 Jul 2002 21:58:29 -0700 (PDT)Tue, 16 Jul 2002 21:58:29 -0700 (PDT)
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Hi Vera,
the problem with the D0->Kspipi is that it is a CP eigenstate and
CompositionTools arbitrarily assigns it to a D0. So the only problem is
with D0 and D*0->D0pi0, no problems with charged Ds
	bye
	ric

On Tue, 16 Jul 2002, Vera Luth wrote:

> Thanks Daniele,
> yes, I suspected the D flavor might be the culprit for decays with Ks, Kl,
> etc.
> Shouldn't we also have a problem for B0 , whenever you
> have a D decaying to a neutral K?
> Ciao,
> Vera
>
>
> Daniele del Re wrote:
>
> > Hi all,
> >
> >  starting from the disagreement shown by Ajit in the lepton spectrum
> > for the wrong sign events for the mode B+->D0pi with
> > D0->Kspipi we finally discovered the bug. In recoilNtp the flavor and the
> > charge of the B is assigned looking at the flavor of the daugther D meson.
> > Unfortunately for D0->Kspipi the flavor is correct only in 50% of the
> > cases. Then the charge and the flavor of the B+ reconstructed in a mode
> > with D0->Kspipi were crap.
> >
> >  This bug should affect B+->D0X with D0->Kspipi (all X systems) in the
> > following ways:
> >
> >  - total charge is wrong
> >  - lepton spectrum (applying the charge correlation) is wrong
> >  - all variables that present differences between right sing and wrong
> >    sing could be affected
> >
> >  I am going to fix the bug (charge and flavor for B+ will be calculated
> > adding up the charge of all the daughters). Then it should be interesting
> > to see how the measurement for B+ will change and how the comparison
> > data-mc will look like (remember that the comparison for B+ was usually
> > not so good).
> >
> >  Daniele and Ric
>
>




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