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Z Segmentation Update (improving reconstruction of non-prompt tracks with the SiD)

Z Segmentation Update (improving reconstruction of non-prompt tracks with the SiD). Lori Stevens (SLAC/UCSC) August 21, 2007 ILC Simulation Reconstruction Meeting. AxialBarrelTrackFinder1 Bug. Phi requirement: phi coordinate of all hits must be within π /2 of each other

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Z Segmentation Update (improving reconstruction of non-prompt tracks with the SiD)

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  1. Z Segmentation Update(improving reconstruction of non-prompt tracks with the SiD) Lori Stevens (SLAC/UCSC) August 21, 2007 ILC Simulation Reconstruction Meeting

  2. AxialBarrelTrackFinder1 Bug • Phi requirement: phi coordinate of all hits must be within π/2 of each other • Bug in my version of code caused phi requirement to be too restrictive • Fixed bug and found improvement in both efficiency and number of fake tracks when using z segmentation

  3. Comparing Z Segmentation Before and After Fix Sample: pythiaZPolebbbar-0-1000_SLIC_v1r9p3_sidaug05.slcio

  4. Some other studies (collisions at 500GeV) • panpyuds_nobeam_nobrem-1-500_SLIC_ v2r0p6_sidaug05.slcio • panpyuds_nobeam_nobrem-3-500_SLIC_ v2r0p6_sidaug05.slcio • panpyuds_nobeam_nobrem-7-500_SLIC_ v2r0p6_sidaug05.slcio

  5. panpyuds_nobeam_nobrem-1-500_SLIC_v2r0p6_sidaug05.slcio

  6. panpyuds_nobeam_nobrem-3-500_SLIC_v2r0p6_sidaug05.slcio

  7. panpyuds_nobeam_nobrem-7-500_SLIC_v2r0p6_sidaug05.slcio

  8. Combining the 3 data sets

  9. 1cm 5cm 10cm 30cm 1cm 5cm 10cm 30cm ZPole vs. 500GeV collisions

  10. Conclusion • The use 4 hit tracks may depend on the jet energy • Will 10cm segmentation make a difference? • Tyler Rice and Chris Meyer are doing a study using variable segmentation in Dima Onoprienko's Garfield Tracker…this may help find some answers

  11. HelicalTrackFitter improvements • Does not currently fit hits in tracker barrel • Improving to fit hits in all regions • Will use various fitting methods such as circle fitting, line fitting, 2D hit consistency checks, and Rich Partridge’s z segmentation code • Presentation next Friday (8/31/07)

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