Elliptic flow ins=200GeV Au+Au collisions ands=2.76TeV Pb+Pb collisions: Insights from viscous hydrodynamics+hadron cascade hybrid model

2011/03/31 by Huichao Song, Steffen A. Bass, Ulrich Heinz +1 · 1 citation
Physics and Astronomy · #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark–gluon plasma #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.83.054912

published as Phys.Rev.C83:054912,2011 · added a figure and discussion; this version accepted by Phys. Rev. C

arxiv created 2011/04/21 · openalex publication_date 2011/05/27 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Using the newly developed hybrid model VISHNU, which connects viscous hydrodynamics with a hadron cascade model, we study the differential and integrated elliptic flow v₂ at different centrality bins for 200 A GeV Au+Au collisions and 2.76 A TeV Pb+Pb collisions. We find that the average quark-gluon plasma (QGP)-specific shear viscosity \ensuremathη/s slightly increases from Relativistic Heavy Ion Collider to Large Hadron Collider (LHC) energies. However, a further study assuming different temperature dependencies for (\ensuremathη/s)_QGP shows that one cannot uniquely constrain the form of (\ensuremathη/s)_QGP(T) by fitting the spectra and v₂ alone. Based on our current understanding, the question whether the QGP fluid is more viscous or more perfect in the temperature regime reached by LHC energies is still open.

Citations

• Transverse flow and hadrochemistry inAu+Aucollisions atsNN=200GeV
• QCD equation of state and hadron resonance gas
• Elliptic and Triangular Flow in Event-by-EventD=3+1Viscous Hydrodynamics
• Effect of flow fluctuations and nonflow on elliptic flow methods
• Importance of Granular Structure in the Initial Conditions for the Elliptic Flow
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Importance of correlations and fluctuations on the initial source eccentricity in high-energy nucleus-nucleus collisions
• Causal viscous hydrodynamics for central heavy-ion collisions II: meson spectra and HBT radii
• Event-by-event hydrodynamics and elliptic flow from fluctuating initial states
• Hadron production in Au–Au collisions at RHIC
• Elliptic flow from a hybrid CGC, full 3D hydro and hadronic cascade model
• Interplay of shear and bulk viscosity in generating flow in heavy-ion collisions
• Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at sNN=2.76 TeV
• Microscopic models for ultrarelativistic heavy ion collisions
• Glauber Modeling in High-Energy Nuclear Collisions
• Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions
• Viscous Hydrodynamic Predictions for Nuclear Collisions at the LHC
• Chemical freeze-out temperature in the hydrodynamical description of Au + Au collisions at √ ^S NN = 200 GeV
• Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions atsNN=2.76 TeV

Cited by

• Spectra and elliptic flow for identified hadrons in2.76ATeV Pb + Pb collisions