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Tracking Efficiency Studies for the SD Option

Tracking Efficiency Studies for the SD Option. Outlook: SD and LD tracker’s geometries and simulation framework. Fiducial volume cuts. Simulation results. Conclusion. V. L. Rykov Wayne State University and RIKEN. Detectors: SD and LD geometries as of March 2001.

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Tracking Efficiency Studies for the SD Option

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  1. Tracking Efficiency Studies for the SD Option • Outlook: • SD and LD tracker’s geometries and simulation framework. • Fiducial volume cuts. • Simulation results. • Conclusion. V. L. Rykov Wayne State University and RIKEN

  2. Detectors:SD and LD geometries as of March 2001. • Resolutions:SD – r = 7 , z = 10 ; LD - r = 100 ,z = 1400 . • Input data: -events at , “panpy-tt-500-010301-*D-sim-**.sio” files. • Tracking:(Deliberately)“blind” use of codes from the “hep.lcd.recon” package. • Analysis: Modified “TrackEfficiencyDriver” code (W. Walkowiak) from “Snowmass-2001” CD tutorial. • Acceptance:Only barrel trackers (+VXD) with forward disk (Endcaps) hits removed (smeared to “a parsec” = 100 m away). • Framework: Local JAS analysis at the (close to) “pocket-size” Sony Vaio laptop. V. L. Rykov, June 28, 2002 Detectors and simulation framework B = 3 T B = 5 T 144 layers

  3. V. L. Rykov, June 28, 2002 Acceptances Track Association: Standard “hit vote” of the “hep.lcd.reco” package. Fiducial volume:|cos()| < 0.65 PT > 0.55 GeV/c  LD  SD Fiducial volume:|cos()| < 0.65 PT > 0.38 GeV/c

  4. V. L. Rykov, June 28, 2002 Missing and “ghost” tracks with the fiducial volume cuts Fiducial volumes for: • Efficiency (counting McTracks): |cos()| < 0.65,PT > 0.55 GeV/c Rc/Mc(>1) = (0.11±0.02)% • Ghost tracks (counting RcTracks): • |cos()| < 0.6,PT > 0.6 GeV/c • Mc/Rc(=0) = (11.4±0.2)% •  LD  SD Fiducial volumes for: • Efficiency (counting McTracks): |cos()| < 0.65,PT > 0.38 GeV/c Rc/Mc(>1) = (0.25±0.03)% • Ghost tracks (counting RcTracks): • |cos()| < 0.6,PT > 0.43 GeV/c • Mc/Rc(=0) = (3.75±0.1)%

  5. V. L. Rykov, June 28, 2002 Tracking efficiencies within fiducial volumes • Tracking efficiencies: • For 100% hit efficiency: (95.3±0.13)% • For 98% hit efficiency: (94.5±0.14)% • For 90% hit efficiency: (89.5±0.20)% •  LD  SD Tracking efficiencies: • For 100% hit efficiency: (97.3±0.10)% • For 98% hit efficiency: (96.6±0.12)% • For 90% hit efficiency: (92.7±0.16)%

  6. V. L. Rykov, June 28, 2002 Missing and ghost energies • For hit efficiency 100%: • Missing energy = (11.7±0.6) GeV = (7.1±0.3)% • Ghost energy = (19.6±0.8) GeV • = (13.1±0.6)% •  LD  SD For hit efficiency 100%: • Missing energy = (5.7±0.4) GeV = (3.3±0.2)% • Ghost energy = (4.8±0.4) GeV = (2.9±0.2)%

  7. V. L. Rykov, June 28, 2002 Conclusion • The existing tracking codes of “hep.lcd.reco” package yield quite descent pattern recognition characteristics for the 5-layer Si barrel tracker of the SD option which are, at minimum, no worse than for the 144-layer TPC of the LD option. • For a conclusive judgment on the SD option tracking capabilities, more realistic simulations with beamstrahlung, event pile up, noise, etc.are needed, and, of course, including forward disks (Endcaps). • There are indications, that the existing tracking codes require a better tuning, particularly for the TPC case. However, … • It is hard to imagine that any further code tune up and improvement could make worse the presented here good pattern recognition characteristics in the SD … unless there is some “crude cheating” in the current codes (like using prior info about Monte Carlo tracks for track finding, which I do not believe is the case).

  8. Δx, cm Δr, cm Δz, cm Δx, cm Δr, cm Δz, cm Δx, cm Δr, cm Δz, cm Δx, cm Δr, cm Δz, cm V. L. Rykov, June 28, 2002 Smearing SDOriginal smearing of the “SmearDriver”LD Forward discs (Endcaps) smeared out to 10 m away

  9. With the maximum of d3p distribution at ~(1.5-2)10-3, the data are consistent with the earlier momentum resolution simulations (B. Schumm, VR, et al): within a factor of ~2 in the momentum range of 0.5 GeV/c < pT < 20 GeV/c. V. L. Rykov, June 28, 2002 Momentum matching SD LD log10(Pt, GeV/c) log10(Pt, GeV/c)

  10. V. L. Rykov, June 28, 2002 Momentum matching LD SD 

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