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Drift Chamber Track Model Status -- April

Enhancing drift chamber tracking by extending to exterior detectors, utilizing UV wires, and improving hit association for accurate track reconstruction and momentum determination. Future plans include systematic analysis and robust fitting algorithms.

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Drift Chamber Track Model Status -- April

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  1. Reminders: track is curving in physical space transform to a space in which the measured hits fall along a straight line fit to this function gives slope (1/p) and intercept (f0) similar (though not identical) procedure in the ‘non-bend’ plane. Plan: extend this to the exterior detectors y r f x f f Drift Chamber Track Model Status -- April

  2. What we showed last time (March computing…) r d b z zed q q0 zvtx DC pointing to exterior detectors with UV wires • Current studies focused here • The point: • p determined in main bend plane • not shown here • zed determined rather well by DC while b is poorly determined • mirror and mis-associated hits • However: • Therefore, utilize field integrals to determine b from zvtx, p, and zed rather than relying on DC points for pointing in z direction (eventually bootstrap points) • Current progress shows x4 improvement in DC pointing • Working out bugs … to be initially committed within ~2 weeks

  3. Being realistic: • through real tracker (imperfect hit association) • 150 mm hit resolution • perfect zvtx information Single tracks... dzed dzed db db After model Before model

  4. Pad chamber pointing • In muon single track events: • Project to pad chambers • compare to pad chamber point along surface of pc

  5. Drift Chamber Evaluating: • Several methods for determining drift chamber efficiency: • Dominant Contributor (got most of the hits) • Pointing good enough to point to PC3 and find point (10cm x 10cm square) • Pointing within expected drift chamber resolution. • Momentum resolution within CDR dp/p • etc. • Ongoing discussions and progress in task force meetings/work Single tracks p Hijing p

  6. DC Track Model to address: Fitting to curve in drift chamber to determine wire resolution for curved tracks reject outlying hits not implemented yet bonus: independently determine momentum without systematic errors associated with fitting a straight line to points on a curve Improve DC pointing to exterior detectors especially in r-z plane, utilizing UV wires aiding in global hit association and track reconstruction Drift Chamber Track Model Efforts

  7. Future plans: • More systematic analysis of pc pointing. Does it jive with expected multiple scattering/dc pointing/pc resolution results? • In progress … today was only a taste of the first results. • Some fraction of ‘lost’ tracks from drift chamber are still from hit mis-associations. • Next on agenda: utilize Tom’s robust fitting algorithm to clean up these tracks • Study systematics/array sizes/speed • etc. etc.

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