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Update on p-Pb Collision Spectra at 5.02 TeV: Preliminary Results and Analysis

This document presents a detailed update on the spectra obtained from p-Pb collisions at a center-of-mass energy of 5.02 TeV. We report on the total statistics collected, highlighting approximately 90 million minimum bias events from LHC runs. The data includes corrected spectra for pions, kaons, and protons across various centrality classes. The main corrections and efficiencies have been evaluated using Monte Carlo simulations. Future steps include improving tracking and PID efficiency evaluations, systematic uncertainty assessments, and further analysis on the collected data.

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Update on p-Pb Collision Spectra at 5.02 TeV: Preliminary Results and Analysis

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  1. HMPID weekly meeting Update on p-Pb spectra G. Volpe 31/10/2013

  2. Spectra in p-Pb collisions p Pb • proton beam energy = 4 TeV; • proton energy in lead nuclei = 4x82/208 ≈ 1.58 TeV; • Center of mass energy per nucleon pair = 2(4x1.58)0.5 ≈ 5.02 TeV; • The center of mass moves in the lab. frame with rapidity Y = - 0.465.

  3. Spectra in p-Pb collisions • Total statistic • p-Pb 5.02 TeV, LHC13b (EDSs pass3): ≈ 20 millions MB events • p-Pb 5.02 TeV, LHC13c (ESDs pass2): ≈ 70 millions MB events • Centrality (multiplicity) selected using the amplitude of the signal of V0A detector; • Spectra evaluated in the rapidity range 0 < YCMS < 0.5; • YLAB = YCMS – 0.465, 0 < YCMS < 0.5 corresponds to -0.465 < YLAB < 0.035 • For each mass hypothesis a cut on YLAB has been applied and the corresponding raw yields has been evaluated. • The main corrections have been estimated from Monte Carlo: • MC productions: LHC13b2_efix_p1, LHC13b2_efix_p2

  4. Spectra in p-Pb collisions: pions Corrected spectra PRELIMINARY

  5. Spectra in p-Pb collisions: kaons Corrected spectra PRELIMINARY

  6. Spectra in p-Pb collisions: protons Corrected spectra PRELIMINARY

  7. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 0-5 %

  8. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 5-10 %

  9. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 10-20 %

  10. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 20-40 %

  11. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 40-60 %

  12. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 60-80 %

  13. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF+rTPC): 80-100 %

  14. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF) Pions

  15. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF): kaon K+ Kaons

  16. Comparison HMPID spectra with combined spectra (ITS+TPC+TOF): proton Protons p

  17. Spectra in p-Pb collisions: pions & kaons < 4 GeV/c Verypreliminary Positive

  18. Spectra in p-Pb collisions: pions & kaons < 4 GeV/c Verypreliminary Negative

  19. Conclusions • p-Pb corrected spectra have been evaluated in all events classes (V0A 0-100%). • Main corrections have been applied (tracking eff., PID eff., distance cut). • Pions and kaons spectra pushed up to 4 GeV/c (very preliminary)!! • To do: • Further increase Monte Carlo statistic for tracking and PID efficiency evaluation? • Cross check PID efficiency from MC with that extracted from real data (V0’s decays). • Estimate GEANT-FLUKA and feed-down correction. • Systematic uncertanties.

  20. Backup

  21. Spectra p-Pb (0-5%): Fit examples

  22. Spectra p-Pb (40-60%): Fit examples

  23. Spectra in p-Pb collisions: tracking efficiency • Tracking efficiency convoluted with the detector acceptance in the required rapidity range; • MC productions: LHC13b2_efix_p1, LHC13b2_efix_p1, LHC13b2_efix_p3 • The corresponding correction is obtained by fitting such distributions

  24. Spectra in p-Pb collisions: PID efficiency

  25. Spectra in p-Pb collisions: distance cut correction

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