Download
slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013 PowerPoint Presentation
Download Presentation
NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013

NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013

70 Vues Download Presentation
Télécharger la présentation

NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Dynamical Modeling and Soft Physics at RHIC and the LHC Huichao Song Peking University NFQCD2013, Kyoto, Japan, Nov.18-Dec.20,2013 Selected Topics: (1) QGP viscosity at RHIC and the LHC (2) Initial State fluctuations & final state correlations (3) Elliptic flow for strange & multi-strange hadrons (4) Soft particle yields and Chemical Freeze-out at the LHC (5) Dynamical modeling near the critical point 12/04/2013

  2. Viscous Hydrodynamics viscous hydrodynamics Song & Heinz PLB08, PRC08 Neglect bulk viscosity Assume zero net baryon density & heat conductivity at RHIC and LHC 2+1-d: OSU, INT, Stony Brook, Pudue, Calcutta (2008), Crakow, Frankfurt(2010) 3+1-d: Mcgill(2011), MSU(2012), Crakow(2012), Nagoya(2013)

  3. Viscous Hydro + hadron Cascade Hybrid Model ideal hydro (QGP & HRG) viscous hydro(QGP & HRG) Initial conditions viscous hydro hadron cascade viscous hydro (QGP) + URQMD (HRG) QGP HRG HRG H. Song, S. Bass, U. Heinz, PRC2011

  4. Event-by-event hydrodynamics Single shot simulations: smoothed initial conditions (before 2010) E-b-E simulations: fluctuating initial conditions (since 2010) B. Schenke et al, Phys.Rev. C85 (2012) 024901

  5. (1)Extracting QGP viscosity from elliptic flow data – VISHNU results

  6. VISHNU hybrid model & QGP viscosity (2011) H. Song, S. Bass, U. Heinz, T. Hirano, and C. Shen, PRL2011 MC-KLN MC-Glauber -Main uncertainties come from initial conditions -Other uncertainties (much smaller) -Initial flow, bulk viscosity, single shot vs. e-b-e calculations (each of them shift V2 by a few percent, partial cancellation among them)

  7. V2 and QGP viscosity at the LHC Song, Bass & Heinz, PRC 2011 The average QGP viscosity is slightly larger at the LHC Please also refer to C. Gale, et al., ArXiv: 1209.5330 [nucl-th]

  8. LHC: spectra for identified hadrons H. Song, S. Bass, U. Heinz, arXiv:13110157 [nucl-th] -a nice fit for pions, kaons and proton spectra

  9. LHC: for identified hadrons VISHNU H. Song, S. Bass, U. Heinz, arXiv:13110157 [nucl-th] A very nice fit of V2(PT) for all centrality bins at LHC from VISHNU hybrid model

  10. (2) Initial State Fluctuations, Final State Correlations & the QGP viscosity

  11. Uncertainties from Initial Conditions H. Song, S. Bass, U. Heinz, T. Hirano, and C. Shen, PRL2011 MC-KLN MC-Glauber Main uncertainties come from initial conditions MC-KLN, larger HIGHER value of QGP viscosity MC-Glauber, smaller LOWER value of QGP viscosity

  12. MC-KLN & MC-Glauber initializations & V3 Pure viscous hydro simulations : Qiu, Shen & Heinz, PLB2012 V3 prefer lower value of QGP viscosity

  13. Initialization & Pre-equilibrium: Updates after 2011 -fluctuations of nucleon positions: MC-Glauber, MC-KLN -fluctuations of color charges (in the framework of CGC): IP-Glasma:B. Schenke et al., arXiv:1202.6646; 1206.6805 [nucl-th] -Pre-equilibriums: Correlated Fluctuation:B. Muller & A. Schafer, arXiv:1111.3347 [hep-ph] . URQMD initialization:H.Petersen & M. Bleicher, Phys. Rev. C81, 044906,2010 AMPT initialization: L. Pang, Q.Wang & X.Wang, arXiv:1205.5019[nucl-th] EPOS/NEXUS initialization:K. Werner et al., Phys. Rev. C83:044915,2011 -fluctuations of local gluon numbers (in the famework of MC-KLN): Multiplicity fluctuations:A. Dumitru and Y. Nara, Phys. Rev. C 85, (2012) 034907 … … … … Mostly, the effects of initializations /pre-equilibrium dynamics was studied with ideal hydro. Their quantitative influences on are still unknown.

  14. Flow at RHIC & LHC: results from IP-Glasma + MUSIC Gale, Jeon ,Schenke, Tribedy &Venugopalan PRL2013

  15. New Observables for Higher Order Flow Harmonics Luzum & Ollitrault, 2012-10 Qiu & Heinz,12-08 C. Gale et al. 12-09 -A further study of flow data in different aspects, using e-b-e hybrid model -They are all sensitive to the QGP viscosity will constrain initialization models, tightening the limit on

  16. Massive data evaluating • Early CHIMERA Results (Comprehensive Heavy Ion Model Evaluation and Reporting Algorithm) Spectra spectra elliptic flow HBT R. Soltz, et al., arXiv:1208.0897[nucl-th] -- Massive data evaluating algorithm becoming available

  17. QGP viscosity at RHIC and the LHC (1) H. Song, NPA2013 (3) (2) (5) (4) (1) Luzum& Romatschke, PRC 2008 RHIC (2) Song, Bass, Heinz, Hirano, and Shen, PRL2011, PRC2011 (3) Song, Bass, Heinz, PRC2011 LHC (4) Qiu, Shen & Heinz, PLB 2012 (5) Gale, Jeon ,Schenke, Tribedy & Venugopalan, PRL2013

  18. (3) Soft Particle Yields & Chemical Freeze-out Temperature at the LHC Tch= 164MeV v.s. Tch= 150MeV J. Stachel,SQM 2013

  19. dN/dyfor identified hadrons (RHIC & LHC) H. Song, S. Bass, U. Heinz, arXiv:1311.0157 [nucl-th] RHIC : 200 A GeVAu+Au LHC : 2.76 A TeVPb+Pb -VISHNU nicely describes the multiplicity for pions, kaons & protons VISHNU: Tsw= 165MeV

  20. dN/dyfor identified hadrons (RHIC & LHC) H. Song, S. Bass, U. Heinz, arXiv:13110157 [nucl-th] RHIC : 200 A GeVAu+Au LHC : 2.76 A TeVPb+Pb -VISHNU nicely describes the multiplicity for pions, kaons & protons -B-Bbar annihilations plays an important role for a nice fit of the proton data VISHNU : Tsw= 165MeV Please also refer to F. Becattini et al., PRC2012

  21. dN/dyfor identified hadrons (RHIC & LHC) J. Stachel,SQM 2013 LHC : 2.76 A TeVPb+Pb -B-Bbar annihilations plays an important role for a nice fit of the proton data Statistical Model : Tch~ 150 MeV (no B-Bbar annihilations!) A system with B-Bbar annihilations does not reach chemical freeze-out ! VISHNU : Tsw= 165MeV

  22. (4) Elliptic flow for Strange & multi-strange hadrons

  23. v2 of Strange & Multi-strange Hadrons Song et al., arXiv:1310.3462 [nucl-th] -Nice descriptions of Lambda, Xi and Omega V2 at various centralities

  24. UrQMD freeze-out time distributions Song et al., in preparation Preliminary Omega pions proton Lambda Xi -On Average Lamba freeze-out even later than pion and protons! -earlier freeze-out for Xi and Omega!

  25. VISHNU vs Hydro with Tdec=165 & 100 MeV Song et al., in preparation Preliminary -freeze-out temperature for Lambda is much below Tc! -freeze-out temperatures for Omega and xi are closer to Tc!

  26. phi-meson

  27. Elliptic flow for phi at the LHC Song, Bass & Heinz, arXiv:1311. 0157 200A GeV Au+Au -Hadron cascade: small cross sections for phi -mass ordering between phi and proton are independent of collision energies, centralities & theoretical details T. Hirano 3+1-d ideal hydro+JAM

  28. Elliptic flow for phi at the LHC Song, Bass & Heinz, arXiv:1311. 0157 200A GeV Au+Au T. Hirano 3+1-d ideal hydro+JAM 200A GeV Au+Au

  29. phi V2 in strong & weakly coupling limit H. Song, S. Bass, U. Heinz, arXiv:13110157 [nucl-th] -hydro + Tdec =165 MeV weakly coupling limit -hydro + Tdec =100 MeV strong coupling limit VISHNU: small cross sections for phi Neither the strongly nor the weakly coupling limit nor the cases in between (VISHNU) could explain the mass-ordering between proton & phi shown by STAR phi-meson puzzle !

  30. (6) Beyond Hydrodynamics dynamical modeling near the critical point Critical Fluctuations: At critical point : Size effects: It is important to address the effects from dynamical evolutions

  31. Dynamical modeling near the critical point -mean field approximation quark & anti-quark is treated as the heat bath (fluid), which interact with the chiral field via effective mass order parameter K. Peach, H. Stocker and A. Dumitru, PRC2003

  32. propagation of initial fluctuations -mean field approximation fluid g=5.5 fluid g=3.7 Critical point First -order K. Peach, H. Stocker and A. Dumitru, PRC2003

  33. Dynamical modeling near the critical point -beyond mean field M.Nahrgang, S.leupold. C. Herold, M. Bleicher , PRC 2011 : damping : noise, Jiang &Song preliminary

  34. Dynamical modeling near the critical point (Chiralfluid dynamics with a Polyakov loop PNJL) C. Herold, et, al. PRC 2012 First -order Critical point -To compare with the experimental data, systematic treatment of freeze-out with external field is necessary

  35. Summary (1) QGP viscosity at RHIC and the LHC -(MC-Glauber; MC-KLN) -Approximately similar averaged QGP viscosity at RHIC and LHC energies (2) Initial state fluctuations & final state correlations -New observables to constrain QGP viscosity & initial conditions (3) Soft particle yields & chemical freeze-out at the LHC -B-Bbar annihilation plays an important role for proton yields -Effective chemical freeze-out of the system with B-Bbar annihilation (4) Elliptic flow for strange & multi-strange hadrons -phi-elliptic flow needs a better understanding (5) Dynamical modeling near the critical point -External sigma field re-organize the structure of initial & internal fluctuations -systematic treatment of the freeze-out with external field is needed in the future

  36. Thank you