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Theory Contribution to study of relativistic Heavy ion collisions at LHC

Larissa Bravina (UiO) pp, flow, freeze-out, HBT, charm-beauty, HYDJET++, Shadowing, small x physics I. Arsene , K.Tywoniuk , Dr. E. Zabrodin Flow in pp Dr. R. Kolevatov , HBT, flow, jets (ALICE and BRAHMS) : I. Arsene , Dr. L. Malinina , PhD G. Eyyubova , PhD M.S.Nilsson.

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Theory Contribution to study of relativistic Heavy ion collisions at LHC

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  1. LarissaBravina (UiO) pp, flow, freeze-out, HBT, charm-beauty, HYDJET++, Shadowing, small x physics I. Arsene, K.Tywoniuk, Dr. E. Zabrodin Flow in pp Dr. R. Kolevatov, HBT, flow, jets (ALICE and BRAHMS) : I. Arsene, Dr. L. Malinina, PhD G. Eyyubova, PhD M.S.Nilsson Bergen town-meeting, 13.04.2010 TheoryContribution to studyofrelativistic Heavy ion collisions at LHC

  2. 1. Gluon shadowing 6. Equation of State Oslo Heavy-iontheorygroup(projects) 4. Freeze-out 2. Elliptic flow 7. Predictions for pp 5. HBT correlations 3. HYDJET++ 8. Flow in pp 9. Di-hadron azimuthal correl. …

  3. 1.Shadowing:Comparisonwith RHIC Au+au @ 200 Gev A. Capella, L.B., E. Ferreiro, A. Kaidalov, K. Tywoniuk, E. Zabrodin, Eur. Phys. J C58 (2008) 437 • weaker comover suppression at forward • weaker recombination at forward • stronger initial state effects! no adjusted parameters!

  4. 1. shadowing: predictions for LHC K. Tywoniuk, L.B. et al., J. Phys. G 35 (2008) 104156 A. Capella, L.B. et al., Eur. Phys. J. C 58 (2008) 437

  5. 2. HYDJET++ = HYDJET + FASTMC I. Lokhtin et al., Comput. Phys. Commun. 180 (2009) 779 N. Amelin, … L.B. … et al., Phys. Rev. C 77 (2008) 014903 FASTMC HYDJET HYDJET++ K. Tywoniuk, L.B. et al., Phys. Lett. B 657 (2007) 170

  6. 3. Elliptic flow in HYDJET++ Hydro flow Jet contribution The model possesses crossing of baryon and meson branches. Hydrodynamics gives mass ordering of v2 G. Eyyubova, L.B. et al., Phys. Rev. C80 (2009) 064907; arxiv:1001.3602[hep-ph]

  7. 3. ELLIPTIC FLOW: predictions for LHC L. B., G. Eyyubova et al., arXiv:1001.3602; PRC 80 (2009) 064907 20% RHIC Hydro+jets = reduction of flow LHC 44% Influence of resonance decays

  8. Constituent Quark Scaling at LHC No scaling for Appearance of the approximate direct particles scaling for all particles LHC: NCQ scaling will be only approximate SQM’09, Buzios, Brasil, 27.09-02.10.2009

  9. 4. Freeze-out at RHIC: UrQMD M.S. Nilsson, ”LHC and beyond” (Lund, Feb. 2009)

  10. freeze-out at RHIC: QGSM M.S. Nilsson , ”LHC and beyond” (Lund, Feb. 2009)

  11. 5. Hanbury-Brown—Twisscorrelations M.S. Nilsson , L.B. et al. (to be submitted) Detector Detector

  12. Non-Identical HBT correlations M.S. Nilsson , L. Malinina, L.B. et al. (to be submitted)

  13. Identical HBT correlations M.S. Nilsson , L. Malinina, L.B. et al. (to be submitted)

  14. 6. EQUILIBRATION IN THE CENTRAL CELL (FAIR) Kinetic equilibrium: Isotropy of velocity distributions Isotropy of pressure Thermal equilibrium: Energy spectra of particles are described by Boltzmann distribution Chemical equlibrium:Particle yields are reproduced by SM with the same values of

  15. EOS: HOW DENSE CAN BE THE MEDIUM? L. B. et al., Phys. Rev. C 78 (2008) 014907 ”Big” cell (V = 5x5x5 fm^3) “Small” cell (V => 0) Dramatic differences at the non-equilibrium stage; after beginning of kinetic equilibrium the energy densities and the baryon densities are the same for ”small” and ”big” cell

  16. EOS IN THE CELL: OBSERVATION OF KNEE temperature vs. chemical potentials L.B. et al., PRC 78 (2008) 014907; E. Zabrodin, L.B. et al, arXiv:0902.4601 S. Ejiri et al., PRD 73 (2006) 054506 Although the “knee” is similar to that in 2-flavor lattice QCD, it is related to inelastic (chemical) freeze-out in the system

  17. A.B. Kaidalov, K.A.Ter-Martirosyan, PLB 117 (1982) N.S.Amelin, L.B., Sov.J.Nucl.Phys. 51 (1990) 133 N.S.Amelin, E.F.Staubo, L.P.Csernai, PRD 46 (1992) 4873 7. QGSM PREDICTIONS FOR PP AT LHC At ultra-relativistic energies: multi-Pomeron scattering, single and double diffraction, and jets (hard Pomeron exchange) Gribov’s Reggeon Calculus + string phenomenology

  18. 7. QGSM:

  19. 7. QGSM:

  20. PREDICTIONS FOR LHC Inelastic collisions NSD collisions

  21. PREDICTIONS FOR PP @ LHC QGSM: extended longitudinal scaling in p+p collisions holds

  22. VIOLATION OF KNO SCALING AT LHC High-multiplicity tail is pushed up, whereas maximum of the distribution is shifted towards small values of z At energies below 100 GeV different contributions overlap strongly, whereas at higher energies – more multi-string processes 2 4 6 8 => Enhancement of high multiplicities

  23. 8. Anisotropic flow in pp

  24. 8. Anisotropic flow in pp

  25. 8. Anisotropic flow in pp

  26. 9. Di-hadron correlations (J. Milosevic, O. Djordjic )

  27. 9. Di-hadron correlations

  28. 9. Di-hadron correlations

  29. 9. Di-hadron correlations

  30. 9. Di-hadron correlations

  31. 9. Di-hadron correlations

  32. Summary and outlook • LHC is a discovery machine for both hard and soft physics in HI collisions • Event generators are an indispensable tool for planing the experiments and analysis of data • => Further development of existing MC generators • HI theory groups in Oslo utilizes it to study : EOS, elliptic flow, particle freeze-out, HBT correlations of unlike particles, particle-jet correlations, heavy quark production in a large pT range, scaling properties …

  33. Back-up Slides

  34. Motivation: ExperimentalResults W. Busza, JPG 35 (2008) 044040 e+e－ Example of extended longitudinal scaling in different reactions

  35. violationofFeynmanscaling UA5 Collab., Phys. Rep. 154 (1987) 247 W. Busza, JPG 35 (2008) 044040 Violation of Feynman scaling, but ext. long. scaling holds?! Charged particle pseudorapidity density at h = 0 as a function of √s

  36. VIOLATION OF ELS IN A+A AT LHC? J. Cleymans, J.Struempfer, L.Turko, PRC 78 (2008) 017901 s Statistical thermal model: ELS will be violated in A+A @ LHC. What about p+p ?

  37. WHY SCALING HOLDS IN THE MODEL? Short range correlations In string models both FS and ELS holds in the fragmentation regions

  38. VIOLATION OF KNO SCALING A.B.Kaidalov, K.A.Ter-Martirosyan, PLB 117 (1982) 247 UA5 Collaboration, Phys. Rep. 154 (1987) 247 N.S.Amelin, L.V.Bravina, Sov.J.Nucl.Phys. 51 (1990) 133 Charged-particle multiplicity distributions in the KNO variables in nondiffractive antiproton-proton collisions at √s = 546 GeV and 53 GeV √s

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