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First results on particle correlations from ALICE

First results on particle correlations from ALICE. Dariusz Mi ś kowiec, GSI Darmstadt and EMMI for the ALICE Collaboration . why two-pion correlations two-pion correlations at 900 GeV first look at 7 TeV data try harder: high-p T correlations summary.

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First results on particle correlations from ALICE

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  1. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 First results on particle correlations from ALICE Dariusz Miśkowiec, GSI Darmstadt and EMMI for the ALICE Collaboration why two-pion correlations two-pion correlations at 900 GeV first look at 7 TeV data try harder: high-pT correlations summary

  2. Collectivity in nuclear collisions Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 collective transverse velocity apparent source of pions with given (y,pT) transverse expansion  pT spectra look thermal but boosted longitudinal expansion  source size depends on pT 2 2

  3. Transverse expansion Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Mike Lisa, CERN Theory Phenomenology Seminar, 16-Oct-2009 temperature and transverse flow when energy conservation treated properly transverse expansion seems to be there even in very peripheral nuclear collisions 3 3

  4. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Pion source size from STAR STAR, arXiv:1004.0925 [nucl-ex] STAR, Phys. Rev. C 80 (2009) 24905 p + p (various ways of fitting) Au + Au Cu + Cu pT dependence of pion source size similar in nuclear and pp collisions

  5. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 identical-pion correlation analysis technique (HBT) peak width ~ 1 / source size pion source size accessible experimentally

  6. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Two-pion correlation functions in A+A and p+p collisions baseline shape is the challenge in p+p data

  7. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 pp at sqrt(s) = 900 GeV 250 k minimum bias events 10 days starting on Dec 6, 2009 7 7

  8. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 identical pion correlation functions Bose-Einstein peak clearly visible D. Miskowiec, ALICE femto meeting 2010-03-22 8 8

  9. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Unlike-sign pion correlation function Coulomb and K0S peaks visible D. Miskowiec, ALICE femto meeting 2010-03-22 9 9

  10. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Multiplicity and transverse momentum dependence identical pions unlike-sign pions baseline has to be treated properly

  11. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Multiplicity dependence for comp.: nuclear collisions M. Lisa, Ann. Rev. Nucl. Part. Sci. 55, 357 visible dependence in pp  HBT radii depend on multiplicity rather than on collision geometry

  12. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Transverse momentum dependence no significant dependence on transverse momentum for comparison: in nuclear collisions

  13. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Dependence on the baseline assumption but: transverse momentum dependence is sensitive to the baseline shape assumption

  14. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 pp at sqrt(s) = 7 TeV 180 M minimum bias events from March 31 till now 120 M events used for this talk

  15. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 pp at sqrt(s) = 900 GeV 7 M minbias events on May 2-3, 2010 2.1 M events used for this talk

  16. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 7 TeV and new 900 GeV data identical pion correlations 120 M events at 7 TeV 2.1 M events at 0.9 TeV high-q baseline flatter at 7 TeV

  17. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 π+π-correlations at 7 TeV Coulomb K0S rich resonance structure ω ρ f0 f2 low-q baseline steeper at 7 TeV  origin: jets high-q baseline flatter at 7 TeV  origin: momentum cons.

  18. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Non-identical particle correlations from pp at 7 TeV pion - kaon C(qout ) asymmetry -- another handle on transverse flow K* example: Pb+Au at 17.2 GeV CF’s from CERES π+π -π- p π+p pion - proton Λ Δ

  19. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 Summary HBT radii at 900 GeV depend on multiplicity no strong dependence on transverse momentum correlation baseline of crucial importance

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  21. transverse momentum dependence of Rside Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 21 21

  22. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 baseline slope significant at 0.9 TeV and above study by Adam Kisiel 22 22

  23. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 7 TeV, identical pions low mult high mult

  24. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 High stat 900 GeV from 2010, identical pions low mult high mult

  25. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 7 TeV, unlike-sign pions low mult high mult

  26. Dariusz Miskowiec, Particle correlations in ALICE, Physics at the LHC, Hamburg, 10-Jun-2010 High stat 900 GeV, from 2010 unlike-sign pions low mult high mult

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