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Investigate new Z veto implementations

Introduction

  • New Z veto implementations:
    • form track collection from all tracks which are isolated (track isolation like for electrons) and fulfill minimal quality requirements (nHits > 7, pT > 1.0)
    • Modus 1: combine selected tracks with ll and lt if opposite sign, ΔR > 0.1 and Δz < 0.5, if invariant mass is within Z mass window, reject event
    • Modus 2: combine 2 tracks from selected tracks if opposite sign, ΔR > 0.1 and Δz < 0.5, if invariant mass is within Z mass window, reject event
    • Modus 3: Modus 1 OR Modus 2

For SumEt comparisons limit plots and numbers to Modus 1 only, as this cut is the dominating one and to avoid proliferation of numbers wink

Compare all 3 modi for BaseLine selection

baseline SM reduction % LM1 reduction % S/B LM2 reduction % S/B LM4 reduction % S/B
plain 17948.00 0.00 884.30 0.00 0.05 89.80 0.00 0.01 434.90 0.00 0.02
modus 1 10245.70 0.43 491.20 0.44 0.05 43.30 0.52 0.00 172.40 0.60 0.02
modus 2 14647.60 0.18 614.10 0.31 0.04 57.70 0.36 0.00 273.40 0.37 0.02
modus 3 10125.20 0.44 462.00 0.48 0.05 40.50 0.55 0.00 165.20 0.62 0.02

  • Sm background reduction ~40 % and LM reduction ~50-60 %
  • S/B almost not changed

Compare all 3 modi for met 10 selection

met 10 SM reduction % LM1 reduction % S/B LM2 reduction % S/B LM4 reduction % S/B
plain 1430.20 0.00 707.90 0.00 0.49 76.90 0.00 0.05 337.10 0.00 0.24
modus 1 815.70 0.43 379.40 0.46 0.47 35.90 0.53 0.04 129.00 0.62 0.16
modus 2 1120.30 0.22 480.40 0.32 0.43 47.40 0.38 0.04 209.20 0.38 0.19
modus 3 793.20 0.45 354.10 0.50 0.45 33.40 0.57 0.04 123.30 0.63 0.16

  • SM background reduction ~45% and LM reduction ~50-60 %
  • S/B minimal changes (LM1) to getting worse (LM4)

Compare modus 1 for sumEt 10 selection

sumEt 10 SM reduction % LM1 reduction % S/B LM2 reduction % S/B LM4 reduction % S/B ALL LM reduction % S/B
plain 1401.4 0 442.8 0 0.32 46.5 0 0.03 245.7 0 0.18 735 0 0.52
modus 1 813.5 0.42 376.9 0.15 0.46 33.7 0.28 0.04 139 0.43 0.17 549.6 0.25 0.68

  • SM background reduction 42% and LM reduction ~25 %
  • S/B changed from 0.3 to 0.5 (LM1) or, the physically meaningless sum of LMx from 0.5 to 0.7

Full standard tables for all modi at [[IngoBlochSandbox][Ingo's sandbox]

Compare all 3 modi for met 1 selection

met 1 SM reduction % LM1 reduction % S/B LM2 reduction % S/B LM4 reduction % S/B
plain 244.00 0.00 504.90 0.00 2.07 58.30 0.00 0.24 226.40 0.00 0.93
modus 1 110.90 0.55 266.90 0.47 2.41 26.40 0.55 0.24 85.20 0.62 0.77
modus 2 176.60 0.28 336.50 0.33 1.91 35.20 0.40 0.20 138.20 0.39 0.78
modus 3 105.90 0.57 249.60 0.51 2.36 24.40 0.58 0.23 80.40 0.64 0.76

  • SM background reduction ~60% and LM reduction ~50-60%
  • S/B minimal changes (LM1) to getting worse (LM4)

Compare modus 1 for sumEt 1 selection

sumEt 10 SM reduction % LM1 reduction % S/B LM2 reduction % S/B LM4 reduction % S/B ALL LM reduction % S/B
plain 156.1 0 161.6 0 1.04 18.3 0 0.12 97.2 0 0.62 277.1 0 1.78
modus 1 74.8 0.52 132 0.18 1.76 15.8 0.14 0.21 58 0.4 0.78 205.8 0.26 2.75

  • SM background reduction 52% and LM reduction 4-18 %
  • S/B changed from 1.0 to 1.8 (LM1) or, the physically meaningless sum of LMx from 1.8 to 2.8

Full standard tables for all modi at [[IngoBlochSandbox][Ingo's sandbox]

Comparison plots baseline (left) vs. baseline && modus 3 (right)












Comparison plots met 10 (left) vs. met 10 && modus 3 (right)












Comparison plots sumEt 10 (left) vs. sumEt 10 && modus 1 (right)












Comparison plots met 1 (left) vs. met 1 && modus 3 (right)












Comparison plots sumEt 1 (left) vs. sumEt 1 && modus 1 (right)












All plots (pdf)

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Topic revision: r5 - 19 Nov 2008 - 08:55:24 - OliverGutsche

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