Heavy-Ion Physics - Hydrodynamic Approach Introduction Hydrodynamic aspect Observables explained Recombination model Summary 전남대 이강석 HIM 2008.11.14.

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Presentation transcript:

Heavy-Ion Physics - Hydrodynamic Approach Introduction Hydrodynamic aspect Observables explained Recombination model Summary 전남대 이강석 HIM

Nuclear matter at high temperature/ density Normal nucleus QCD - color - confinement - asymptotic freedom - gluon Strong interaction Nucleus at high T or baryon density QGP

Normal nucleus

Relativistic heavy-ion collisions Brookhaven AGS S+Au 15GeV A CERN SPS Pb+Pb 158GeV A RHIC Au+Au 200 Gev A LHC : ALICE, CMS -under construction

Landau Hydrodynamics Landau, Izv. Akad. Nauk SSSR 17,51(1953) Nuovo Ciment, Suppl. 3, 11115(1956) pp collision Initial condition – initial entropy of the system adiabatic hydrodynamic motion constant total entropy - constant number of particles longitudinal expansion followed by transverse expansion has successfully explained 1. total number of produced charged particles 2. rapidity distribution

Longitudinal expansion Transverse expansion Equation of state for relativistic massless gas Hydrodynamic equations Energy momentum tensor

Schematic view of heavy-ion collisions fireball model

Cooper-Frye formula for produced hadrons : freeze-out hypersurface

Particle Ratios Central 130 GeV Au+Au STAR QM Poster: M. Kaneta Agreement between model and data is very good! STAR Preliminary fit parameters :

transverse momentun spectra Exponential shape Higher the mass, flatter the slope Fits all the different slopes simultaneouly 200 GeV Central Au+Au Preliminary p -- K-K- fit parameters

line of S/A = const

Early chemical freeze-out followed by later thermal freeze-out Particle numbers fixed after chem. f.o. until thermal f.o. - need many chem. pot. Chem. f.o. + hadron cascade Teaney, Hirano Nonaka, Bass Sudden hadronization ?

Elliptic coefficient v2 Directed flowElliptic flow Anisotropic flow  correlations with respect to the reaction plane X Z XZ – the reaction plane Picture: © UrQMD

Elliptic coefficients agree with those from the hydrodynamic calculation for the perfect fluid - should be system of quarks and gluons but not of hadrons Son : There exists lower limit of, where is bulk viscosity. How can this contradiction reconciled? - viscous relativistic hydrodynamics is being actively studied. - problem of causality : Israel-Stewart formulation - Son’s prediction may be wrong. Ads/CFT

V2 and pT per number of constituent quarks scales. - quarks show collective behavior.

Constituent quark number scaling - quarks show collective flow

Transverse momentum spectra in the large PT region

Pt (GeV/c) P/pion

Recombination model

Dynamic recombination model initial state pre-equilibrium QGP and hydrodynamic expansion hadronization hadronic phase and freeze-out QGP hydrodynamic evolution - C. Nonaka reasonable for a perfect fluid Hadronization via recombination recombination Hadronic rescattering URQMD - S. Bass

mesons baryons quark distribution meson wave function Degeneracy factor or

Quenching or broadening of away-side jet?  4 < p T trig < 6 GeV/c

summary Hydrodynamic approach in heavy-ion collisions is quite successful in many of the observables. RHIC has revealed many new features - high pt suppression of hadrons - elliptic flow : strongly interacting perfect liquid vs. lower limit of - viscous hydrodynamics - broadening of away-side jet : Mach cone? - ridge structure of near-side jet LHC is expected to show many interesting new Physics.

Suppression of high pt particles