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Update on Pb-Pb Spectra Analysis: Tracking and PID Efficiencies from CERN Meeting

This document summarizes findings from the CERN weekly meeting held on April 9, 2013, focusing on the analysis of Pb-Pb collision spectra. It includes detailed fit examples and raw yield data for pions, kaons, and protons across various centrality bins (0-5%, 5-10%, etc.). Key topics addressed include tracking efficiency, PID efficiency, and necessary corrections. Preliminary results for corrected spectra of pions, kaons, and protons in the most central bins (0-10%) are presented, highlighting the importance of both Monte Carlo and real data for accurate PID efficiency estimation.

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Update on Pb-Pb Spectra Analysis: Tracking and PID Efficiencies from CERN Meeting

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  1. HMPID weekly meeting Update on Pb-Pb spectra G. Volpe CERN, 04/09/2013

  2. Spctra in Pb-Pb collisions: fit exapmples

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

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

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

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

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

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

  9. Spectra in Pb-Pb collisions: PID efficiency

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

  11. Spectra in Pb-Pb collisions: pions (0-10 % centr.) Corrected spectra PRELIMINARY

  12. Spectra in Pb-Pb collisions: kaons (0-10 % centr.) Corrected spectra PRELIMINARY

  13. Spectra in Pb-Pb collisions: protons (0-10 % centr.) Corrected spectra PRELIMINARY

  14. Conclusions • Pb-Pb corrected spectra have beeb evaluated in two most central centrality bins (0-5%, 5-10%). The same procedure will be applied for the semi central collisions asap. • Main corrections have been applied (tracking eff., PID eff., distance cut), feed down still missing. • PID efficiency has been extracted fromMonte Carlo. It is a very critical parameter, real data have to be also used (V0’s decays).

  15. Backup

  16. Primarytracksmultiplicity

  17. Pb-Pb analysis status: protons PID eff. from V0s PID efficiency for protons and anti-protons, extracted by means of V0s selection. Difference between the two charge is present. Protons Anti-protons From Francesco

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