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

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Presentation transcript:

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 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

Comparing Z Segmentation Before and After Fix Sample: pythiaZPolebbbar _SLIC_v1r9p3_sidaug05.slcio NoneNone no bug 30cm 30cm30cm no bug 10cm 10cm10cm no bug 5cm5cm 1cm1cm #MCPs Found with 5 hits Found with 4 hits Missed Fake

Some other studies (collisions at 500GeV) panpyuds_nobeam_nobrem-1-500_SLIC_v2r0p6_sidaug05.slciopanpyuds_nobeam_nobrem-3-500_SLIC_v2r0p6_sidaug05.slciopanpyuds_nobeam_nobrem-7-500_SLIC_v2r0p6_sidaug05.slcio

panpyuds_nobeam_nobrem _SLIC_v2r0p6_sidaug05.slcio No segments 30cm segments 10cm segments 5cm segments 1cm segments # MCPs Found with 5 hits Found with 4 hits Missed57315 Fake

panpyuds_nobeam_nobrem _SLIC_v2r0p6_sidaug05.slcio No segments 30cm segments 10cm segments 5cm segments 1cm segments # MCPs Found with 5 hits Found with 4 hits Missed Fake

panpyuds_nobeam_nobrem _SLIC_v2r0p6_sidaug05.slcio No segments 30cm segments 10cm segments 5cm segments 1cm segments # MCPs Found with 5 hits Found with 4 hits Missed Fake

Combining the 3 data sets No segments 30cm segments 10cm segments 5cm segments 1cm segments # MCPs Found with 5 hits Found with 4 hits Missed Fake

ZPole vs. 500GeV collisions 1cm5cm10cm30cm 1cm5cm10cm30cm

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

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)