Update on Pb-Pb spectra

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