WHbb and WHuu Studies
Monica DunfordFTK Monthly Meeting
March 13th, 2007
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Summary of Samples
• FTK WHbb and WHuu samples– Using six layers (3 pixel, 1st, 2nd and 4th SCT
layer)– Using seven layers (3 pixel, 4 SCT)
• All iPat reconstruction done using version 12.0.6
• iPat reconstruction without TRT• WHbb ~47,000 events• WHuu ~35,000 events
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Summary of Cuts
• For all samples, the following are applied– -1.0 < Cot() < 1.0– -0.3 < curvature(GeV-1) < 0.3– No cuts on truth track association
Note: See supplementary material for additional plots
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Number of Tracks
• FTK with version 12 training still reconstructs too few tracks
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Impact Parameter Distribution
• Disabling the TRT has little effect on iPat’s impact parameter distribution
WHbb WHuu
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iPat Fake Rates
• Disabling the TRT has small effect on the iPat fake rate as well
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Results With Seven Layers
• Using seven layers has noticeable improvement in FTK impact parameter
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A Previous Problem
• Using six layers, impact parameter distribution looked the same for different Pt ranges
FTK iPat
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Using Seven Layers
• The impact parameter vs Pt distribution is like expected
FTK iPat
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FTK Impact Parameter
• bb/uu separation looks improved, although strange shape in seven layer uu distribution
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Impact Parameter Resolution
• Adding 7th layer shows definite improvement in resolution
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FTK Fake Rates
• Fake rates the same for six and seven layer FTK versions
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Conclusions
• Disabling the TRT has little effect on iPat impact parameter distribution
• Using seven layers in FTK results in great improvement of the impact parameter distribution
• Seven layers in FTK also fixes the impact parameter vs. Pt effect seen with the six layer version