$Purity^{direct}(<t) = \frac{N_{J/\psi}^{direct}(<t)}{N_{J/\psi}^{direct}(<t)+ N_{J/\psi}^{indirect}(<t)}$ (1)

  $Efficiency^{direct}(<t) = \frac{N_{J/\psi}^{direct}(<t)}{N_{J/\psi}^{direct}}$ (2)

The direction of the pseudo-proper time cut is reversed for the indirect Jpsi case.

  Pseudo-proper time Cut (ps) Direct Purity (%) Direct Efficiency (%) Indirect Purity (%) Indirect Efficiency (%)
Total 1.1 81 80 78 79
Sailor 1.3 83 80 78 81
Cowboy 0.8 84 78 78 84

TruthLxy.eps shows that difference in Cowboy and Sailor Lxy due to reconstruction, not in truth.

VertexChi2.eps shows that electrons from indirect Jpsi more difficult to vertex - larger percentage of tracks that pass simulated trigger have chi2>50 compared with electrons from direct Jpsi.

See attachments

-- SueCheatham - 08-Oct-2009

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps BarrelCowboys.eps r1 manage 13.0 K 2009-10-09 - 15:43 UnknownUser  
Unknown file formateps BarrelSailors.eps r1 manage 12.8 K 2009-10-09 - 15:43 UnknownUser  
Unknown file formateps BarrelTotal.eps r1 manage 13.0 K 2009-10-09 - 21:42 UnknownUser  
Unknown file formateps PurityEfficiencyDirect.eps r1 manage 12.6 K 2009-10-09 - 15:40 UnknownUser  
Unknown file formateps PurityEfficiencyDirectCowboys.eps r1 manage 10.7 K 2009-10-09 - 15:40 UnknownUser  
Unknown file formateps PurityEfficiencyDirectSailors.eps r1 manage 11.0 K 2009-10-09 - 15:40 UnknownUser  
Unknown file formateps PurityEfficiencyDirectTotal.eps r1 manage 11.0 K 2009-10-09 - 21:42 UnknownUser  
Unknown file formateps PurityEfficiencyIndirect.eps r1 manage 13.4 K 2009-10-09 - 15:39 UnknownUser  
Unknown file formateps PurityEfficiencyIndirectCowboys.eps r1 manage 11.3 K 2009-10-09 - 15:39 UnknownUser  
Unknown file formateps PurityEfficiencyIndirectSailors.eps r1 manage 11.3 K 2009-10-09 - 15:39 UnknownUser  
Unknown file formateps PurityEfficiencyIndirectTotal.eps r1 manage 11.3 K 2009-10-09 - 21:42 UnknownUser  
Unknown file formateps TruthLxy.eps r1 manage 11.5 K 2009-10-09 - 22:15 UnknownUser  
Unknown file formateps VertexChi2.eps r1 manage 21.5 K 2009-10-10 - 12:58 UnknownUser  
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Topic revision: r6 - 2009-10-12 - unknown
 
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