==========================================
Minutes of Tracking Meeting, July 25, 2007
==========================================
taken by U. Husemann


Aseet Mukherjee: Summary of Changes to COT Tracking
===================================================

- Bugfix in online calibration 
  o Problem: TDC->cell mapping
  o Fix: Do new t0, but need new alignment as well

- General code cleanup, uniform treatment of cell tilt, drift time limit

- Drift times are now double precision

- Rewrite of segment finding
  o correct aspect angle correction
  o compatible with BackwardMods
  o Different modes for segment finding, use compromise between 
    speed and performance

- HL tracking
  o remove bias in charge asymmetry
  o consistent use of beam position

- Stereo tracking: code completely rewritten
  o old code: would stop at the first vertex with at least one hit
  o new: much better stereo hit finding efficiency

- Track merging:
  o old: merging using hit overlap and track parameter
  o new: redefinition of overlap fraction, sort list of tracks

- SH tracking: histograms using segment
  o brand new: needs tuning
  o not used by default: SL+HL do very well, maybe for higher luminosities

- dE/dx correction:
  o no dE/dx correction in all of Gen6: bug fixed
  o strong track density variation
  o consequence: electron tagging, dE/dx wrong for high lumi
  o Aseet will add dE/dx information into separate object
  o Tom Phillips & Ulrich will spread the information to the offline group


Matt Herndon: Int10 Validation
==============================

- Check forward silicon efficiency: unchanged w.r.t int 9 (as expected)
- Will check impact of hit resolution change: more fakes?


Koji Sato: Int10 Validation for COT
===================================

- See more stereo hits than before, esp. SL1 and SL3, expected (Aseet)
- No additional tails in delta z0 between legs of Z->mumu seen


Antonio/Ben/Ulrich: Int10 Validation
====================================

- Basic checks on Z->mumu/ee MC and high-pt lepton data
- All distributions checked look reasonable
- Visible reduction of number of tracks with zero Si hits
- To do: comparison to standard production output