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Drift Chamber Track Model Status -- April

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 ( f 0 ) similar (though not identical) procedure in the ‘non-bend’ plane. Plan: extend this to the exterior detectors.

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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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