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ITTF Strangeness Reconstruction: Methods, Results, and Future Plans by Lee Barnby

This review by Lee Barnby discusses the latest advancements in the ITTF strangeness reconstruction project. It highlights methodologies used including the novel V0 finder designed to improve track analysis, the challenges with real central data production, and findings regarding Lambda and anti-Lambda ratios. The report also outlines future strategies for further research, including efficiency analysis in simulations and optimizations for various particle tracks. Barnby emphasizes the importance of reproducibility in physics results and the continual development of tracking techniques.

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ITTF Strangeness Reconstruction: Methods, Results, and Future Plans by Lee Barnby

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  1. Strangeness Reconstruction with ITTF Lee Barnby ITTF Review - BNL 24 September 2002

  2. Introduction • New code (Gene just told you) • What we did • Results: a chronology • Future plans ITTF Strangeness - Lee Barnby

  3. What we did • ITTF tracking run and tracks added to StEvent • I ran 2 jobs • New V0 finder looking only at ITTF tracks • New V0 finder looking only at orginal • Otherwise I’d get 4x as many V0s • Separately run analysis • All this is for real central data ITTF Strangeness - Lee Barnby

  4. Why only real central data? • Real central data production worked • hijing data had SVT, this is extra complication because tracks with SVT points have different set of cuts • We have no experience with SVT V0s (yet) so conclusions would be difficult • Also ran over embedding output to get increased Lambda sample but ran out of time looking at that ITTF Strangeness - Lee Barnby

  5. p||+ + pT(arm) - pT(arm) neutral p||- Armenteros Plot pT(arm) K0 _ L L ITTF Strangeness - Lee Barnby 

  6. ITTF as of last week ITTF Strangeness - Lee Barnby

  7. ITTF Last week Ratio =0.69 ITTF Strangeness - Lee Barnby

  8. Original tracks Not due to V0 Finder… ITTF Strangeness - Lee Barnby

  9. Original tracks Ratio = 0.75 ITTF Strangeness - Lee Barnby

  10. ITTF this weekend ITTF Strangeness - Lee Barnby

  11. Original tracks – this weekend (same of course) ITTF Strangeness - Lee Barnby

  12. ITTF latest – Forward field Ratio = 0.70 ITTF Strangeness - Lee Barnby

  13. Original tracks latest Forward field Ratio = 0.78 (previously 0.75) Yield comparsion Lam. O: 1360 I:1063 Lbar. O:1061 I:740 i.e. 22% reduction for Lam, 30% reduction for Lbar ITTF Strangeness - Lee Barnby

  14. ITTF latest Reverse field Ratio = 1.3 !!! Charge signs are switched Lambda and anti-Lambda get switched ITTF Strangeness - Lee Barnby

  15. Latest original tracks Reverse field Ratio = 0.78 (Just to show you its Not the V0 finder) ITTF Strangeness - Lee Barnby

  16. 0.4 GeV 1.0 GeV K0 Masses as function of pt From ITTF 2.0 GeV ITTF Strangeness - Lee Barnby

  17. 0.4 GeV 1.0 GeV K0 Masses as function of pt From original 2.0 GeV ITTF reduced at all pt, needs to be quantified ITTF Strangeness - Lee Barnby

  18. Future plans - testing • Check change in efficiency from simulation • Can actually do full analysis for central data and compare results (K0 would be better than Lambda though) • Try to track down reasons for efficiency loss • All comparisons use same cuts, may have to optimize cuts separately for each • Other particles Xi, kink kaons • Xi is similar, kink daughters are short tracks in outer TPC ITTF Strangeness - Lee Barnby

  19. Longer term • V0 finder could use Kalman extrapolation and look for overlap of cones and not a fixed distance of closest approach • Requires very good knowledge of errors of course • Should be driven by physics for spectra reproducibility of cut quantity distributions in MC is important. For HBT, flow etc. efficiency and putiry important. ITTF Strangeness - Lee Barnby

  20. Conclusion • I think we can use this ITTF Strangeness - Lee Barnby

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