第19回Heavy Ion Café並びに第12回Heavy Ion Pub合同研究会

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Presentation transcript:

第19回Heavy Ion Café並びに第12回Heavy Ion Pub合同研究会重イオン衝突における粘性流体描像門内晶彦（東大理）第19回Heavy Ion Café並びに第12回Heavy Ion Pub合同研究会「QCD物質の最前線」、2011年6月8日、名古屋大学

Color glass condensate Introduction “Standard model” of a high-energy heavy ion collision (at RHIC) Hydrodynamic stage Color glass condensate Hadronic cascade Glasma/Thermalization Freezeout ｔ particles t Freezeout QGP phase hadronic phase Pre-equilibrium z Relativistic hydrodynamics Description of collective motion of the QGP (τ ~ 1-10 fm/c) Discuss the latest experimental data at LHC and RHIC from the perspectives of viscous fluids New Developments

New Developments Higher-order harmonics (v3, v4, v5…) - Quantified in hydrodynamic models More observables = more constraints on models - Product of initial fluctuations ALICE plenary ATLAS plenary Higher-Order Harmonics

Higher-Order Harmonics Initial conditions: Glauber (η/s = 1/4π) vs. MC-KLN (η/s = 2/4π) PHENIX arXiv:1105.3928 v3 in favor of Glauber? This does not rule out the KLN - η/s would not be indep. of temperature - Bumpy initial conditions may mimic viscosity - Thermalization (CGChydro) *CGC w/o resonance decay and multiplied by factors obtained in Glauber Higher-Order Harmonics

Higher-Order Harmonics Shear viscosity: Glauber (η/s = 0) vs. Glauber (η/s = 1/4π) ALICE (Talk by J. Schukraft) v3 “has different sensitivity to η/s than v2!” In other words, no complete data fit by a single η/s (at least for now)　 CMS (Talk by J. Velkovska) Bulk viscosity ζ/s ≠ 0 around Tc ; can become non-negligible Higher-Order Harmonics

Higher-Order Harmonics Temperature dependent η/s Talk by H. Niemi Hadronic viscosity always important; QGP viscosity more important at LHC than at RHIC? Poster by C. Shen Higher-Order Harmonics

Higher-Order Harmonics Flux tubes in initial conditions Talk by Ph. Mota vn may depend on “bumpiness” of the initial geometry which mimics viscosity Higher-Order Harmonics

Higher-Order Harmonics More observables translate into more constraints - Higher order harmonics in Au-Au and Pb-Pb collisions Product of fluctuation in initial conditions; centrality independent Possible “other” observables - U-U collisions at RHIC for clearer intrinsic v4? - Intrinsic odd-order harmonics (v3, v5…) in asymmetric collisions (e.g. Cu-Pb) ? Clear centrality dependences may be observed Towards Integrated Pictures

Towards Integrated Pictures Not only transverse; Longitudinal dynamics Pb+Pb, 2.76 TeV at η = 0 CGC ? Charged particle multiplicity (0-5%) CGC predictions ALICE: dNch/dη = 1584 ± 4 ± 76 dNch/dη ~ 1200 CMS: dNch/dη = 1610 ± 55 Towards Integrated Pictures

Towards Integrated Pictures AM and T. Hirano, arXiv:1102.5053 CGC rapidity distribution + Full 2nd order viscous hydro RHIC LHC Entropy production Entropy flux If the true λ is larger at RHIC, it enhances dN/dy at LHC; Hydro effect is an important factor in explaining the LHC data Currently (1+1)D; (3+1)D viscous hydro under development Towards Integrated Pictures

Towards Integrated Pictures AM and T. Hirano, arXiv:1102.5053 CGC rapidity distribution + Full 2nd order viscous hydro RHIC LHC Entropy production Entropy flux If the true λ is larger at RHIC, it enhances dN/dy at LHC; Hydro effect is an important factor in explaining the LHC data If the λ is unchanged at RHIC, dN/dy is still enhanced at LHC; Hydro effect is an important factor in explaining the LHC data Currently (1+1)D; (3+1)D viscous hydro under development Towards Integrated Pictures