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