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Update on Pb-Pb spectra

Update on Pb-Pb spectra

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Update on Pb-Pb spectra

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  1. HMPID weekly meeting Update on Pb-Pb spectra G. Volpe CERN, 19/09/2013

  2. Updates • Monte Carlo statistics to evaluate PID efficiency has been increased. • Corrected spectra evaluated in central and semi-central collisions (0 – 50 %)

  3. Spectra in Pb-Pb collisions: pions (0-50 % centr.) Corrected spectra PRELIMINARY Centrality bins: 0 – 5 % 5 – 10 % 10 – 20 % 20 – 30 % 30 – 40 % 40 – 50 %

  4. Spectra in Pb-Pb collisions: kaons (0-50 % centr.) Corrected spectra PRELIMINARY Centrality bins: 0 – 5 % 5 – 10 % 10 – 20 % 20 – 30 % 30 – 40 % 40 – 50 %

  5. Spectra in Pb-Pb collisions: kaons (0-50 % centr.) Corrected spectra PRELIMINARY Centrality bins: 0 – 5 % 5 – 10 % 10 – 20 % 20 – 30 % 30 – 40 % 40 – 50 %

  6. Conclusions • Pb-Pb corrected spectra have been evaluated in central and semi-central collisions (0-50%). • Main corrections have been applied (tracking eff., PID eff., distance cut). • To do: • Further increase Monte Carlo statistic for PID efficiency evaluation. • Cross check PID efficiency from MC with that extracted from real data (V0’s decays). • Estimate feed-down correction.

  7. Backup

  8. Spctra in Pb-Pb collisions: fit exapmples

  9. Spectra in Pb-Pb collisions: pions raw yields Centrality bins: 0 – 5 % 5 – 10 % 10 – 20 % 20 – 30 % 30 – 40 % 40 – 50 %

  10. Spectra in Pb-Pb: kaons raw yields Centrality bins: 0 – 5 % 5 – 10 % 10 – 20 % 20 – 30 % 30 – 40 % 40 – 50 %

  11. Spectra in Pb-Pbcollsions: protons raw yields Centrality bins: 0 – 5 % 5 – 10 % 10 – 20 % 20 – 30 % 30 – 40 % 40 – 50 %

  12. Spectra in Pb-Pb collisions: tracking efficiency Tracking efficiency convoluted with the detector acceptance in the required rapidity range (MC prod. : LHC12a17a_fix)

  13. Spectra in Pb-Pb collisions: PID efficiency (0-5 % centr.)

  14. Spectra in Pb-Pb collisions: PID efficiency (5-10 % centr.)

  15. Spectra in Pb-Pb collisions: PID efficiency

  16. Spectra in Pb-Pb collisions: distance cut correction

  17. Primarytracksmultiplicity