ForwardSCTMonitorsandbox < Sandbox

%TOC{title="Contents:"}%

----+ Introduction
This package is designed as on offline monitor to demonstrate/verify proper functioning of SCT modules by tracking particles through the detector and comparing the hits found to those predicted.
The  hit efficiency is measured on a per module level, for both 
the barrel and endcap regions.

The code is designed to be versatile enough to be used for commisioning and long term running of the detector.

Be able to read and write results to database



----+ Unbiased Efficiency Calculation

For a given module:
Eff     =    #hits Observed / #Hits Expected


For a given track intersecting a given layer/disk:
   * Remove hits (if present) from ith disk and refit track
   * Apply any track quality cuts 
   * Extrapolate refitted track to ith disk and find intersection point(Using TrkExtrapolation)
   * Is it an active module?
   * Is the intersection point m_distcut from edge/bond gap?
   * Was there a hit within m_distcut from intersection point?
     * if yes :  EFFICIENT
     * if no : INEFFICIENT
This prediction becomes the denominator

---++ Default input parameters
   * Input track collection = "SCT_Cosmic_Tracks"
   * m_distcut = 1.5 mm
   * Fitter = TrkKalmanFitter
   * number of sct hits >=8 (i.e. at least 4 space points)


----+ Unbiased Residual Calculation
This calculation uses the same refitted track sample as for the efficiency calculation.
Plotted is the difference in the local x-coordinate between the intersection point and the removed hit.
   * A double gaussian is fitted to the residuals in each module
   * A minimum number of events is required before the fit is made to prevent silly fits

---++ Results
Default parameters are used unless otherwise mentioned
  
    
   * Run 3007 http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/3007/unbiasedResults.html

| *Run*|*conditions*|*efficiency*|*residuals*|*hitsontracks*|
| 2997 | default | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/unbiasedEfficiencies.html][eff]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/unbiasedResiduals.html][resid]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/HitMap.html][hits]]|
| 2997 | sct and trt tracks| [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/SCTandTRT/unbiasedEfficiencies.html][eff]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/SCTandTRT/unbiasedResiduals.html][resid]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/SCTandTRT/HitMap.html][hits]]|
| 2997 | Number sct hits >= 6| [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/Nsct_ge_6/unbiasedEfficiencies.html][eff]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/Nsct_ge_6/unbiasedResiduals.html][resid]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/Nsct_ge_6/HitMap.html][hits]]|
| 2997 | SCT and TRT tracking, Number sct hits >= 6| [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/Nsct_ge_6_SCTandTRT/unbiasedEfficiencies.html][eff]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/Nsct_ge_6_SCTandTRT/unbiasedResiduals.html][resid]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/2997/Nsct_ge_6_SCTandTRT/HitMap.html][hits]]|
| 3007 | default | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/3007/unbiasedEfficiencies.html][eff]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/3007/unbiasedResiduals.html][resid]] | [[http://hep.ph.liv.ac.uk/~hayward/Cosmics/real_data/3007/HitMap.html][hits]]|

-- Main.HelenHayward - 04 Jul 2006
Topic revision: r2 - 2006-07-04 - HelenHayward
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