A Second Zero Suppression Study with the Fast MC

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A Second Zero Suppression Studywith the Fast MC

• John Krane
• Iowa State University

DØ CTF Mini-Workshop 7 October, 2002
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Updated Method
Should address many concerns from last week
10-20 Noisy 20 Noisy
10-20 Good 20 Good

• Study 10-20 GeV jets, and 20 GeV jets
• Data is ZSP1s special runs
• Study jets vs total Ncells
• Few cells noisy jets
• 400 cells good jets (in this sample)
• Select sample to simulate (energy and noisy/good)
• Generate layer energies from histos
• Get Efrac for successive cells in lyr from hist
• Stop when SEfrac gt100.0
• Add noise, then suppress with different thresholds

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Not yet implemented

• Noise from actual calib (Roberts histos)
• Studies of same in MC
• For reasons not related to ZSP,I dont have
  updated results from the new methodology

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Ncells vs Total Jet Energy

• Assumes 0.7 cone
• Jet ET gt 10 GeV yet S cell ET lt10many merged
  jets

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ZSP schemes
1 EM1
2 EM2
3,4,5,6 EM3
7 EM4
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9
10
11 FH1
12 FH2
13 FH3
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15 CH
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17

• 1.5 s zsp
• 2.5 s zsp
• 1.5 in low-noise layers (2,3,4,5,6,7)and 2.5
  elsewhere
• 1.5 in low-occupancy layers (12,13,15)and 2.5
  elsewhere

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Summary

• Reworking Fast ZSP Monte Carlo
• Improvements will include
• Can improve noise sim with direct histograms
• Different h ranges
• Still need suggestions for ZSP schemes
• Tried two variable-s schemes (suppress noisy
  layers, suppress high-occupancy layers)
• Decide what variables to optimize (How should I
  simulate the MET? Systematic noise?)