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SVT/EST results

SVT/EST results. SVT/EST history and data SVT/EST Relative acceptance to TPC EST efficiency Pt Resolution Global Tracks. Primary Tracks. Track Residuals (Z=anode) Dependance with pt Dependance with num of TPC hits Dependance with the SVT hit error in the refit. EST/SVT enhancements

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SVT/EST results

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  1. SVT/EST results • SVT/EST history and data • SVT/EST Relative acceptance to TPC • EST efficiency • Pt Resolution • Global Tracks. • Primary Tracks. • Track Residuals (Z=anode) • Dependance with pt • Dependance with num of TPC hits • Dependance with the SVT hit error in the refit. • EST/SVT enhancements • dca • strangeness J. Takahashi, STAR Collab. Meeting, Aug. 2003

  2. StEstMaker • It projects TPT tracks to the SVT volume and tries to match SVT hits to the existing track. • It does not increase the Acceptance, but it can change track status from global to primary. HISTORY • A slight problem was detected in the EST matching, that effected tracking efficiency for events with PV z < ± 3 cm. • Changed the min. hit requirement for matching from 2 to 1 hit. • Finner tunning for EST parameters for pp data. • Finner tunning of SeqAdjuster and ClusterFinder. Simulated dAu data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  3. SVT/EST Acceptance to TPC • TPC: with at least 5 hits • TPC+SVT: at least 5 hits in TPC+at least 1 hit in SVT Simulated dAu data Globals Primaries J. Takahashi, STAR Collab. Meeting, Aug. 2003

  4. Relative Acceptance between SVT/EST and TPC Simulated dAu data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  5. Old EST Efficiency Efficiency = (# EST tracks) / (# TPC tracks that has projections to the SVT) 2001 pp data Primaries, 60% Globals, ~50% J. Takahashi, STAR Collab. Meeting, Aug. 2003

  6. New EST Efficiency • Better Sequence Adjuster/Cluster Finder. • Minimum hit requirement for matching: 2 -> 1. • Problem with Z=±3 cm. 2001 pp data Globals, ~60% Primaries, 80% J. Takahashi, STAR Collab. Meeting, Aug. 2003

  7. Pt Resolution for Global Tracks ITTF – Bum Choi Simulated dAu data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  8. pt Resolution for Primaries ITTF – Bum Choi Simulated dAu data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  9. Track Residuals for hits in SVT barrel 2 Simulated dAu data • TPC Only • TPC+SVT, considering 300 um • errors on SVT hits for refit • TPC+SVT, considering 10 um • errors on SVT hits for refit J. Takahashi, STAR Collab. Meeting, Aug. 2003

  10. Track Residual for hits on SVT barrel 2 2001 pp data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  11. Bum Choi’s residuals in Z ITTF – Bum Choi SVT barrel 2 pt > 2GeV/c J. Takahashi, STAR Collab. Meeting, Aug. 2003

  12. Z residual dependance on refit errors TPC only, Simulation TPC only, data pt > 1GeV/c J. Takahashi, STAR Collab. Meeting, Aug. 2003

  13. Z residual vs. Num of TPC hits (data) 2001 pp data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  14. DCA of primary tracks 2001 pp data Simulated dAu data J. Takahashi, STAR Collab. Meeting, Aug. 2003

  15. Lambda reconstruction 2001 pp data J. Takahashi, STAR Collab. Meeting, Aug. 2003

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