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Analysis of ɸ Resonances and Kaon Identification in ALICE with GRID Framework

This presentation by Francesco Noferini details the methods and results of analyzing ɸ resonances and kaon identification efficiencies in proton-proton collisions at 10 TeV using the ALICE detector. It covers the procedure for efficiency estimation, corrections applied, mass resolution from tracking, and the impact of systematic effects. By utilizing Monte Carlo simulations, various pT spectra and ɸ properties (mass and width) were assessed. The findings suggest that the presented methods are capable of effectively extracting essential particle physics data from early data acquisition phases.

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Analysis of ɸ Resonances and Kaon Identification in ALICE with GRID Framework

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  1. GRID and f analysis in pp Francesco noferini (infncnaf – infnbologna) ALICE TOF - general meeting - F. Noferini - GRID and resonances

  2. ɸanalysis – the procedure • Efficiency estimate • Particle Identification (PID) efficiency for kaons • From kaons efficiency to ɸ efficiency • Corrections • Mass resolution from the tracking • Shift on the mass from the tracking • Systematics effects • For tracking • For PID • pT spectrum • ɸ properties : (mass, width) ALICE TOF - general meeting - F. Noferini - GRID and resonances

  3. pTspectrumcorrectedforefficiency (II) 5.6M ppMB at 10 TeV Systematics evaluated with MC 78M ppMB at 10 TeV TOF time resolution  T0 resolution = 80 ps ALICE TOF - general meeting - F. Noferini - GRID and resonances

  4. Mass resolution from the tracking allpT ALICE TOF - general meeting - F. Noferini - GRID and resonances

  5. ɸproperties : (mass, width) from Monte Carlo “truth” 74M ppMBevents Effect due to the acceptance (0.1%) Integrated on the whole pT range ALICE TOF - general meeting - F. Noferini - GRID and resonances

  6. ɸproperties : (mass, width)(Voigtian = Breit-Wignergaussian) realisticanalysis Background fit 78M ppMBevents ALICE TOF - general meeting - F. Noferini - GRID and resonances

  7. ɸproperties : (mass, width)(Voigtian = Breit-Wignergaussian) realisticanalysis Background fit 5.6M ppMBevents ALICE TOF - general meeting - F. Noferini - GRID and resonances

  8. pTspectrumfor TOF timeresolutionof 130 ps Presented at IFAE ‘09(Bari, 16th April) Reconstructedspectrumcorrectedforefficiecy. The currentstatisticsisenoughtoperformsuchmeasurementsin the first daysof data acquistion. • A sample of1.8MppMB (√s = 10 TeV) eventswasgeneratedwith PYTHIA6 and usedtoperform the followinganalyses. The first analyses on real data (pp@900GeV) are confirming the hypoteses assumed in these studies (T0 resolution, TOF time resolution, …) TOF time resolution = 130 ps LHC clock T0 resolution = 160 ps TOF T0 resolution  50-60 ps ALICE TOF - general meeting - F. Noferini - GRID and resonances

  9. PbPb MB results (preliminary) No background subtruction 90% of background (same sign kaons) subtructed ALICE TOF - general meeting - F. Noferini - GRID and resonances

  10. Preparationofpublicationofanearlyphysicspaper ALICE TOF - general meeting - F. Noferini - GRID and resonances

  11. First look at ppMB data - √s = 900 GeV T0 from TOF when available (if not from the machine clock, beam-beam < 160 ps)  PRELIMINARY 1° day results results on 7/12/2009 collisions on 6/12/2009 Run: 104068, 104070, 104157, 104159 NeventsSPD= 4222 NT0-TOF=262 K p ALICE TOF - general meeting - F. Noferini - GRID and resonances

  12. TOF resolution and abundancies With time slewing correction Nevents = 26726 NeventsSPD = 7367 NeventsT0-TOF = 478 NtracksTOF = 2123 PRELIMINARY ALICE TOF - general meeting - F. Noferini - GRID and resonances

  13. TOF resolution and abundancies Nevents = 26726 NeventsSPD = 7367 NeventsTOF-T0 = 478 NtracksTOF = 2123 PRELIMINARY ALICE TOF - general meeting - F. Noferini - GRID and resonances

  14. Eventtime (T0-TOF) efficiency Nevents ALICE TOF - general meeting - F. Noferini - GRID and resonances

  15. T0-TOF Run 1 Nevents Run 2 ALICE TOF - general meeting - F. Noferini - GRID and resonances

  16. Backup ALICE TOF - general meeting - F. Noferini - GRID and resonances

  17. PID Efficiency (Contamination) TOF resolution at 80 ps (final resolution) • Efficiency • contamination TOF resolution at 130 ps (current resolution) ALICE TOF - general meeting - F. Noferini - GRID and resonances

  18. Calcolo parametri della ɸ con risoluzione realistica (Voigtian = Breit-Wigner  gaussiana) con l’effetto dovuto al Background subtraction 74M ppMBevents Sovrastima dovuta a fondo residuo (2-3%) ALICE TOF - general meeting - F. Noferini - GRID and resonances

  19. ALICE TOF - general meeting - F. Noferini - GRID and resonances

  20. PYTHIA ppMB 193k eventi Meeting TOF offline - F. Noferini - task performance

  21. PYTHIA ppMB 193k eventi Meeting TOF offline - F. Noferini - task performance

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