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Outline

Strange and Identified Particle Production Lee Barnby , University of Birmingham & Michele Floris , CERN For the ALICE Collaboration. Outline. Particle Identification in ALICE Detectors and techniques Final results at √ s = 900 GeV Submitted to EPJC Status of the analysis at 7 TeV

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Outline

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  1. Strange and Identified Particle ProductionLee Barnby, University of Birmingham& Michele Floris, CERNFor the ALICE Collaboration

  2. Outline • Particle Identification in ALICE • Detectors and techniques • Final results at √s = 900 GeV • Submitted to EPJC • Status of the analysis at 7 TeV • Plans arXiv:1101.4110 arXiv:1012.325 L. Barnby - MB&UE WG ALICE Strangeness and PID

  3. ALICE Collaboration: > 1000 Members>100 Institutes > 30 countries Detector: Size: 16 x 26 meters Weight: 10,000 tons 3

  4. PID detectors Different detectors/techniques to cover a wide momentum range Today 0.1 – 2.5 GeV TPC dE/dxs ≈5-6% No vertex cut ! Vertex detector pT(min)<100MeV TOF 150k channels! s ≈ 90 ps L. Barnby - MB&UE WG ALICE Strangeness and PID PLC 20J. Schukraft

  5. Secondary vertex studies +PID Reconstruction from charged tracks tracking inward secondary track selection displaced vertex finder Identification of secondary vertices quality selection (ITS clusters…) daughterPID(dE/dx, TOF, etc…) Strange particles: topological identification Weak decay of strange particles displaced vertices (ct~cm) charged decay daughters K0S, L, X- and W- high branching ratio (>64%) L. Barnby - MB&UE WG ALICE Strangeness and PID

  6. X reconstruction L. Barnby - MB&UE WG ALICE Strangeness and PID

  7. Invariant mass distributions arXiv:1012.3257 L. Barnby - MB&UE WG ALICE Strangeness and PID

  8. Systematic checks Multiple detectors or techniques can be cross-checked L. Barnby - MB&UE WG ALICE Strangeness and PID

  9. Levy Fits Maybe add a 1 or 2 fits of dE/dx and reshuffle slides L. Barnby - MB&UE WG ALICE Strangeness and PID

  10. K/p ratio pT dependence √s dependence ALICE STAR NA49 E735 UA5 L. Barnby - MB&UE WG ALICE Strangeness and PID

  11. PYTHIA Comparisons L. Barnby - MB&UE WG ALICE Strangeness and PID

  12. Strangeness, pT and PYTHIA L K0S X f L. Barnby - MB&UE WG ALICE Strangeness and PID

  13. Mean pT L. Barnby - MB&UE WG ALICE Strangeness and PID

  14. Lambda/K0 ratio Part of difference to CDF is because they do not correct for feed-down from Ξ L. Barnby - MB&UE WG ALICE Strangeness and PID

  15. Performance 7 TeV For particles which were limited (X, f) or not possible (W) at 900 GeV we expect at 7 TeV many more pT bins for X, Φ and enough to extract W yield Λ and K0S also have much bigger pT reach L. Barnby - MB&UE WG ALICE Strangeness and PID

  16. Plans • pp @ 7 TeV • Finish standard analysis like 900 GeV • Include PYTHIA8 comparison • PID underlying event analysis • mT spectra • Multiplicity dependence • Divide using measured Nch • Report dNch/dh in each class • Approach used in HBT paper Eur. Phys. J. C (2010) 68: 345–354 L. Barnby - MB&UE WG ALICE Strangeness and PID

  17. Perspective • Possible future developments • Correlations of identified particles • Hadro-chemistry of jets • Normalization to different classes of events for comparsions • INEL>0 or INEL>1 classes • Need to find common definition - same or unidentified spectra or ? • Report in similar limited phasespace • Eg “candle” pT> 0.5, |eta| < 0.8 L. Barnby - MB&UE WG ALICE Strangeness and PID

  18. Thanks… • … especially to our PhD students working on strangeness and identified particles L. Barnby - MB&UE WG ALICE Strangeness and PID

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