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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:
07 Jul 2002 03:43:16 -0700 (PDT)Sun, 07 Jul 2002 03:43:16 -0700 (PDT)
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Hi all,

 here I show the plots requested by Vera with a tighter cut on pstar (>1.4
GeV). I remind you that this is the region in which we see the largest
discrepancy in the pstar scan.

 Let's start (as usual) with the default (pstar>1.4GeV)

 Q0
 --

 All  BRBR = 0.0169568 +- 0.00429284(stat) +- 0.00124551(MC stat)
 B0   BRBR = 0.00235403 +- 0.00709449(stat) +- 0.00221536(MC stat)
 Bch  BRBR = 0.0264142 +- 0.00537665(stat) +- 0.00176532(MC stat)

 Q1
 --

 All  BRBR = 0.0253766 +- 0.00483482(stat) +- 0.00142611(MC stat)
 B0   BRBR = 0.014166 +- 0.0076322(stat) +- 0.00230331(MC stat)
 Bch  BRBR = 0.0335839 +- 0.00626531(stat) +- 0.00199422(MC stat)


 Pstar > 1.4 GeV
 ---------------

 Q0
 --

 All  BRBR = 0.0130908 +- 0.00402655(stat) +- 0.00117558(MC stat)
 B0   BRBR = 0.000386693 +- 0.0283125(stat) +- 0.00222378(MC stat)
 Bch  BRBR = 0.0219818 +- 0.00506049(stat) +- 0.00163685(MC stat)


 Q1
 --

 All  BRBR = 0.0180254 +- 0.00458489(stat) +- 0.00134207(MC stat)
 B0   BRBR = 0.0053208 +- 0.00722136(stat) +- 0.0023749(MC stat)
 Bch  BRBR = 0.0277197 +- 0.00593719(stat) +- 0.00183152(MC stat)


 and the plot for p*>1.4GeV are

 http://www.slac.stanford.edu/~daniele/vub/pcmsgt14q0.eps
 http://www.slac.stanford.edu/~daniele/vub/pcmsgt14q0B0.eps
 http://www.slac.stanford.edu/~daniele/vub/pcmsgt14q0Bch.eps
 http://www.slac.stanford.edu/~daniele/vub/pcmsgt14q1.eps
 http://www.slac.stanford.edu/~daniele/vub/pcmsgt14q1B0.eps
 http://www.slac.stanford.edu/~daniele/vub/pcmsgt14q1Bch.eps


 Remind that in these numbers everything is changing, Nu, BGvcb and Nsl
and then the uncorrelated error could be very difference from the difference
in quadrature.

 A conclusion could be: less background -> lower values especially for Q1.
But for sure at this level the uncertainty in the B->ulnu spectrum can
play a role.

 Daniele




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