A Short History of the DCH background simulation effort

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A Short History of the DCH background simulation
effort

• An archaeological report
• (no new work)

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Discovery Sites

• Thomas Schietingers web page http//www.slac.sta
  nford.edu/BFROOT/www/Detector/CentralTracker/back
  grounds/index.html
• Mike Kelsey and others
• (my apologies if I failed to mention someones
  work)

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Ancient Annals

• 1999 earliest background simulation projects
  focused on two areas.
• health of chamber (ageing), electronics (rad dose
  and HV current), daq (hit occupancy), trigger
  (bkgnd hit patterns), reco (tracking
  efficiencies)
• effects of bkgnd on physics quantities (mass
  resolution)
• 2002 additional physics studies (momentum mass
  resolution as well as hit occupancy and tracking
  efficiencies)

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The Early Days

• April 1999 (T.Schietinger)
• DCH response to simulated machine background.
• 20k HER 20k LER Turtle rays ? DCH
• Impact on occupancy, wire current, absorbed dose

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http//www.slac.stanford.edu/BFROOT/www/Detector/C
entralTracker/backgrounds/index.html
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Backgrounds and Physics I

• April 1999 (S.Wagner)
• Effect on mass resolutions
• BABAR Monte Carlo (G3) plus real background
  frames
• Reconstruction used 8-series code

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mass resolution signal yield (after adding in bkgnd)
J/? -gt µµ- 2.3 -3.5 (538 -gt 519)
Ks -gt pp- 4.3 -4.5 (621 -gt 593)
B -gt J/? Ks No mass constraint -5.3 -6.9 (274 -gt 255)
B -gt J/? Ks Mass constraint 0.6 -7.8 (282 -gt 260)
http//www.slac.stanford.edu/BFROOT/www/Detector/C
entralTracker/backgrounds/PRSF000229.html
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Backgrounds and Physics II

• Feb 2003 (M.Margoni, M.Posocco, M.Zancan)
• Effect of bkgnd on B -gt D-gtDp
• BABAR sim background frames
• Reconstruction used 10-series code
• http//www.slac.stanford.edu/BFROOT/www/Organizati
  on/CollabMtgs/2002/detDec2002/Mon5b/margoni.pdf

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4
http//www.slac.stanford.edu/BFROOT/www/Organizati
on/CollabMtgs/2003/detJuly2003/Fri2a/kelsey.ps
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Last Slide

• Thomas Schietinger left SLAC in February 2002
• Arrival of new Turtle rays integrated with G4
  detector simulation -gt mini can then be
  processed through standard DCH Fast Monitoring
  code