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Vub measurement using recoil of fully reconstructed Bs

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Subject:
From:
Wolfgang Menges <[log in to unmask]>
Date:
10 Apr 2006 02:28:04 -0700 (PDT)Mon, 10 Apr 2006 02:28:04 -0700 (PDT)
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Hi Heiko,

Here is a short summary. Antonio fitted the MC background sample (Breco
with wrong Breco reconstruction) seperately for neutrals and charged Bs.
See http://www.slac.stanford.edu/~petrella/mesfits/mesfits.html, second
set of plots from 06 - Apr - 2006.

Both fits converge but show the same behaviour as the fit to the full set
(first plot in frist set of plots from 06 - Apr - 2006. The peak region is
not fitted vey well. Here are the chi2 for all three fits:

	full sample: 2.7769
	neutral Bs: 3.2169
	charged Bs: 2.48632

You can see an improvement in the charged Bs compareed to the full sample,
but at the same time the chi2 for the neutral Bs worsen.

Antonio and I concluded that this does not help us to improve the fit
around the peak and we didn't do any further studies or fits. So we drop
this option.

Heiko, this is the opposite conclusion as yours. Can you tell me why you
think the fit i improved?

Cheers,

	Wolfgang

On Mon, 10 Apr 2006, Heiko Lacker wrote:

> Hi,
>
> I just realized that Antonio up-dated his web page already last Thursday
> http://www.slac.stanford.edu/~petrella/mesfits/mesfits.html
>
> Antonio, could you please post a short summary?
>
> Looking at the plots for the separate fits to charged and neutral B
> background it seems that a separation for these BG's should improve
> the fit.
>
> If I'm not wrong the plots in the first row show fits when combining
> charged and neutral B's. Did you try to separate the fits into charged
> and neutral B's in order to see if the two samples can be described in
> a better way by the two fits?
>
> Alternatively, one could fix the BG parameters for both classes and also
> the ratio between these two BG classes on the MC in order to see if the
> combined fit describes the data in a better way..
>
> Cheers,
> Heiko
>

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Wolfgang Menges
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