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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:
30 Oct 2002 07:47:29 -0800 (PST)Wed, 30 Oct 2002 07:47:29 -0800 (PST)
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Hi all,

 I reoptimized the cut on the purity (since the selection is changed and
the full dataset is available). The stat. significance as a function of
the cut on the purity (all analysis cuts applied) is in:

Dstar
http://www.slac.stanford.edu/~daniele/vub/optpur/dstaropt.eps

Dc
http://www.slac.stanford.edu/~daniele/vub/optpur/dcopt.eps

Dstar0
http://www.slac.stanford.edu/~daniele/vub/optpur/dstar0opt.eps

D0
http://www.slac.stanford.edu/~daniele/vub/optpur/d0opt.eps

The optimal values now are

 - D*   ipur > 24%
 - Dc   ipur > 9%
 - D*0  ipur > 8%
 - D0   ipur > 9%

before they were

 - D*   ipur > 14%
 - Dc   ipur > 6.5%
 - D*0  ipur > 5%
 - D0   ipur > 6%

 I propose to apply these new cuts. The yields will be 15-20% lower with a
large gain in purity and in the number of selected events.

 If you agree, I will commit the new cuts.


 Daniele









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