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Strangeness Reconstruction with ITTF

Strangeness Reconstruction with ITTF. Lee Barnby. Introduction. New code (Gene just told you) What we did Results: a chronology Future plans. What we did. ITTF tracking run and tracks added to StEvent I ran 2 jobs New V0 finder looking only at ITTF tracks

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Strangeness Reconstruction with ITTF

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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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