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Hit and Tracking

Hit and Tracking. Data set used: Hijing MinBias simulations Usually, absolute value of efficiency is too ideal … comparisons between current code & IT Approach First look at bulk with loose cuts…

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Hit and Tracking

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  1. Hit and Tracking • Data set used: Hijing MinBias simulations • Usually, absolute value of efficiency is too ideal • … comparisons between current code & IT • Approach • First look at bulk with loose cuts… • All multiplicities, fit Points > 9, |eta|<1.5, no dca cut (3 cm implicit for primaries), look only at pi+ • Then look in finer detail with realistic cuts • 3 multiplicity bins, fit Points>23, |eta|<.5, dca<1.5

  2. Hit Efficiency vs Multiplicity Hit Efficiency = #hits in common / #MC hits • Current Tracker • Integrated Tracker

  3. Hit Efficiency vs pT • Current Tracker • Integrated Tracker

  4. Hit Efficiency vs Eta • Current Tracker • Integrated Tracker

  5. Padrow of Last Hit • Current Tracker • Integrated Tracker padrow

  6. Padrow of Last Hit vs eta • Current Tracker • Integrated Tracker

  7. Padrow of First Hit vs Eta • Current Tracker • Integrated Tracker

  8. Fit Points I • Current Tracker • Integrated Tracker Loose cuts: All mult, |eta|<1.5, dca<3, Fit Pts>9

  9. Fit Points II • Current Tracker • Integrated Tracker Low, Medium, High Multiplicity Tight cuts: Fit Points>23 Dca<1.5, |eta|<0.5 Normalized To 1

  10. Fit Point “Efficiency”: Fit Points/MC Hits • Current Tracker • Integrated Tracker Low, Medium, High Multiplicity

  11. Mean Fit Points vs pT I • Current Tracker • Integrated Tracker

  12. Mean Fit Points vs pT II Low, Medium, High Multiplicity • Current Tracker • Integrated Tracker

  13. Mean Fit Points vs Eta I • Current Tracker • Integrated Tracker

  14. Mean Fit Points vs eta II • Current Tracker • Integrated Tracker Low, Medium, High Multiplicity

  15. “Efficiency” vs Multiplicity Here, efficiency is: All Matched Tracks All MC Tracks (even MC tracks Not in acceptance) So, absolute scale Much worse than True efficiency. • Current Tracker • Integrated Tracker

  16. Efficiency vs pT I Here, efficiency is: Found & Matched MC Accepted i.e. as in all spectra analyses • Current Tracker • Integrated Tracker

  17. Efficiency vs pT II • Current Tracker • Integrated Tracker Low, Medium, High Multiplicity

  18. Efficiency vs eta I • Current Tracker • Integrated Tracker

  19. Efficiency vs eta II • Current Tracker • Integrated Tracker Low, Medium, High Multiplicity

  20. Snapshot of tracker and “To Do” • Shape of distributions are similar to current tracker • Mean Fit Points shows similar trends with multiplicity, pt and eta • Shape at low fit points shows a bump not seen before • Efficiency is still low comparted to current tracker • Low pT part needs tuning • Perhaps a 2nd pass removing hits already used… • Crucial to increase efficiency • Also : test distributions in embedding, need to match real data • Fit points, global DCA, etc.

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