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Status of the PPR chapter 5 : Central tracking

This document provides information on the structure, performance, and ongoing development of the central tracking and PID techniques used in the PPR chapter. It covers topics such as TPC tracking, TRD tracking, ITS tracking, TOF matching, and combined tracking.

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Status of the PPR chapter 5 : Central tracking

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  1. Status of the PPR chapter 5 : Central tracking Marian Ivanov

  2. TPC tracking (1) • Structure: • Stochastic processes in TPC • 3 pages 1-4 • Accuracy of local coordinate measurement • 4 pages -4-8 • Center-of-gravity error parametrization • 2 pages – 8-9 • Precision of cluster COG determination using measured amplitude • 1 page 10 • Estimation of the precision of cluster position determination using measured cluster shape • 1.5 page 11-12

  3. TPC tracking (2) • Structure: • TPC Cluster finder • +Subsections: • Cluster unfolding • Cluster characteristic • 3 pages -12-15 • TPC tracking • Subsections: • Track parameterization • Seed finding algorithms, strategy • Parallel kalman tracking • Dedx measurement • 8 pages – 15-23

  4. TPC tracking (3) • Status: • Performance: • Not yet written • Part of the combined tracking performance? • Other mentioned parts • Written • On afs • Under discussion

  5. TPC PID • Structure • dEdx measurement • Truncated mean + • Shared clusters removal • Correction for extended cluster shape • dEdx error parameterization • Function of number measured points, number of shared clusters and dEdx value estimate • Status: • Not yet written • Expected – ~ 4 pages

  6. TRD tracking (1) • Structure: • TRD. General Description and Working Principle. • 2.5 pages -1-2.5 • Stochastic processes in TRD detector and detector Simulations • Subsections: • Transition radiation absorption • Electron drift path. ExB effect. • Pad response function. • 8 pages – 2.5-11 • Accuracy of local coordinate measurement. • Tail cancellation, symmetrization • Cluster reconstruction • Non-Linearities, systematic effects • 8 pages – 11-19

  7. TRD tracking (2) • Structure: • Position and angular resolution. • Subsection • Dependence on S/N • Dependence on Incident Angle • Both subsection: Comparison of simulation and test beam data. • 5 pages, 19-23

  8. TRD tracking (3) • Structure: • Off-line reconstruction • Clustering method • Occupancy and Cluster unfolding • 2 pages, 24-25 • Tracking • Tracklet finding. • Tracklet error parameterization – serial correlation • Kalman filtering

  9. TRD tracking (4) • Status: • Performance: • Not yet written • Templates for picture exist • Part of the combined tracking performance? • Other mentioned parts • Written • On afs • Under discussion

  10. ITS tracking (1) • Structure: • Off-line reconstruction • Clustering method • Cluster unfolding • Cluster error parameterization • Tracking • Parallel tracking • Missing part - to be developed • Extension of ITS tracking in pseudorapidity up to ~2 • Status: • Based on CHEP 2004 article • 3 pages – extended to 5-6

  11. ITS tracking + V0 finder • Structure: • ITS integrated V0 finder algorithm • Primary DCA error parameterization • DCA error parameterization • Point angle error parameterization • Causality likelihood • Combined likelihood • Primary DCA + DCA + PA +Causality • Signal over background as function of cut on combined likelihood • Invariant mass and momenta resolution as function of momenta • Lambda, K0s and gamma conversion • Efficiency as function of likelihood cut • Status: • Written - ~ 9 pages

  12. TOF matching (1) • Structure: • As additional part to TOF • Position resolution of TRD prolongation in TOF (described by covariance matrix) • Space likelihood - integral of probability distribution of TOF pad • Non gaussian probability distribution • Causality likelihood • Time likelihood – as additional information in case of “doubtfull” space likelihood • Combined likelihood – minimax approach • Status: • Not yet written – Delayed by the new development of TRD simulation • ~ 5 pages expected

  13. Combined tracking (1) • Structure: • Off-line reconstruction • Tracking schema • Kink reconstruction • Status: • Not yet written • Based on CHEP 2004 article • 3 pages – extended to 5-6

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