Hi all,
here are a few numbers from my study of an integrated purity cut. I
have the following cuts: 0.0, 0.1, 0.2 0.3, 0.4, 0.5, 0.6, 0.7, 0.8. The
numbers are from VVFs result.dat file.
Number of semileptonic events before background subtraction. To get an
impression of what we loose:
Nsl = 105686
Nsl = 105686
Nsl = 105686
Nsl = 90040.9
Nsl = 70120.1
Nsl = 59346.9
Nsl = 43481.7
Nsl = 29999.7
Nsl = 14712.2
Background subtracted ratio (looks quite stable):
(Nsl - BG)/Nsl (vub corrected) = 0.929849
(Nsl - BG)/Nsl (vub corrected) = 0.929849
(Nsl - BG)/Nsl (vub corrected) = 0.929849
(Nsl - BG)/Nsl (vub corrected) = 0.929883
(Nsl - BG)/Nsl (vub corrected) = 0.929295
(Nsl - BG)/Nsl (vub corrected) = 0.929081
(Nsl - BG)/Nsl (vub corrected) = 0.928474
(Nsl - BG)/Nsl (vub corrected) = 0.928204
(Nsl - BG)/Nsl (vub corrected) = 0.927771
The pstarfactor:
pstarfact 1.05571 +- 0.0161501
pstarfact 1.05571 +- 0.0161501
pstarfact 1.05571 +- 0.0161501
pstarfact 1.04933 +- 0.0171875
pstarfact 1.04953 +- 0.0194575
pstarfact 1.04083 +- 0.0207942
pstarfact 1.03212 +- 0.0231472
pstarfact 1.01948 +- 0.0269841
pstarfact 1.00562 +- 0.0377533
And finally the partial BRBR:
PartialBRBR = 0.0139225 +- 0.00116947(stat) +- 0.000404075(MC stat)
PartialBRBR = 0.0139225 +- 0.00116947(stat) +- 0.000404075(MC stat)
PartialBRBR = 0.0139225 +- 0.00116947(stat) +- 0.000404075(MC stat)
PartialBRBR = 0.0126852 +- 0.00123447(stat) +- 0.000405462(MC stat)
PartialBRBR = 0.0119573 +- 0.00133944(stat) +- 0.000484691(MC stat)
PartialBRBR = 0.0110474 +- 0.00137170(stat) +- 0.000501760(MC stat)
PartialBRBR = 0.0112305 +- 0.00147592(stat) +- 0.000553075(MC stat)
PartialBRBR = 0.0100832 +- 0.00184243(stat) +- 0.000674057(MC stat)
PartialBRBR = 0.0121519 +- 0.00238772(stat) +- 0.000883651(MC stat)
I would drop the last number and then the trend is lower partial BRBR
for purer samples. Both error sources increase with purer sample as
expected. So, what is the final figure of merit to choose a cut? Needs
to be discussed today.
Cheers,
Wolfgang
--
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Wolfgang Menges
Queen Mary, University of London SLAC, MS 35
Mile End Road 2575 Sand Hill Road
London, E1 4NS, UK Menlo Park, CA 94025, USA
+44 20 7882 3753 ++1 650 926 8503
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