SMT Detector Inefficiencies

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SMT Detector Inefficiencies
Simon Dean
University of Manchester
Monday 16th December 2002
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Topics

• The Event Sample Used
• Data Extraction Procedure
• Efficiencies
• Looking at inefficiencies

This Talk
http//www-d0.fnal.gov/sdean/talks/SMTefficiencie
s2.ppt
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Data Sample

• Run 169183
• Taken last Thursday (12/12/2002)
• 20000 events recoed so far (482000 total.)
• Dead/Disabled/Noisy statuses grabbed.
• p13.04.00 reco version

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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Data Extraction Procedure
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Unpacking-Based Efficiency
Modified unpacking output - strip no., hits,
status Database information SMT mask of
theoretical maxima
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Barrel 1 Mask
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Tracking Based Efficiencies

• p13.04.00 tracking
• Tracks require
• gt 5GeV pT
• At least 2 other 2d hits in SMT

Resolutions -1d hits (associated and
non-associated) matched to track crossing position
barrel p-side resolution 17.8µm
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Tracking Based Efficiencies
Locate closest cluster in detector track
position - 1d cluster centroid lt (5
resolution) HIT
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Comparison
Looked for big efficiency differences
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Simon Dean - SMT Detector Efficiencies
Mini Event Display

• Uses cluster based information ( no 'unassociated
  tracks'!!!)
• Events contain ³1 high-pT tracks with at least 2
  other 2d SMT hits
• Selected B1-1-4
• UB efficiency 99.74
• TB efficiency 68.35 (139 crosses, 95 matches)
• 10 of 44 inefficiencies seen here

HIT
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Simon Dean - SMT Detector Efficiencies
Example of a Miss
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Simon Dean - SMT Detector Efficiencies
Another Example of a Miss
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
Yet Another Example of a Miss ( Hit)
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies
To Do...

• 'Empty' detectors
• Quantify trends (ie.. layer averages)
• 1d detector behaviour
• Direct comparison with 2d hit data
• Exclude inefficient strips

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Simon Dean - SMT Detector Efficiencies
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Monday 16th December 2002
Simon Dean - SMT Detector Efficiencies