Elliptic Flow: A Brief Review

Abstract

One of the fundamental questions in the field of subatomic physics is what happens to matter at extreme densities and temperatures as may have existed in the first microseconds after the Big Bang and exists, perhaps, in the core of dense neutron stars. The aim of heavy-ion physics is to collide nuclei at very high energies and thereby create such a state of matter in the laboratory. The experimental program started in the 1990's with collisions made available at the Brookhaven Alternating Gradient Synchrotron (AGS), the CERN Super Proton Synchrotron (SPS) and continued at the Brookhaven Relativistic Heavy-Ion Collider (RHIC) with maximum center of mass energies of 4.75, 17.2 and 200 GeV respectively. Collisions of heavy-ions at the unprecedented energy of 2.76 TeV have recently become available at the LHC collider at CERN. In this review I will give a brief introduction to the physics of ultra-relativistic heavy-ion collisions and discuss the current status of elliptic flow measurements.

version accepted by NJP

References in corpus (36)

• Experimental and Theoretical Challenges in the Search for the Quark Gluon Plasma: The STAR Collaboration's Critical Assessment of the Evidence from RHIC Collisions
• Formation of dense partonic matter in relativistic nucleus-nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration
• Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics
• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• The PHOBOS Perspective on Discoveries at RHIC
• Glauber Modeling in High Energy Nuclear Collisions
• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• New Forms of QCD Matter Discovered at RHIC
• Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
• Conformal Relativistic Viscous Hydrodynamics: Applications to RHIC results at sqrt(s_NN) = 200 GeV
• The Effect of Shear Viscosity on Spectra, Elliptic Flow, and HBT Radii
• Equation of state and QCD transition at finite temperature
• QCD Equation of State and Hadron Resonance Gas
• Flow analysis with cumulants: direct calculations
• Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
• Flow analysis from multiparticle azimuthal correlations
• On the Strongly-Interacting Low-Viscosity Matter Created in Relativistic Nuclear Collisions
• Elliptic flow from two- and four-particle correlations in Au + Au collisions at sqrt{s_{NN}} = 130 GeV
• Hydrodynamic Models for Heavy Ion Collisions
• The Importance of Correlations and Fluctuations on the Initial Source Eccentricity in High-Energy Nucleus-Nucleus Collisions
• Has the QCD Critical Point been Signaled by Observations at RHIC ?
• Translation of collision geometry fluctuations into momentum anisotropies in relativistic heavy-ion collisions
• Elliptic flow in the Gaussian model of eccentricity fluctuations
• Effect of flow fluctuations and nonflow on elliptic flow methods
• Systematic parameter study of hadron spectra and elliptic flow from viscous hydrodynamic simulations of Au+Au collisions at sqrt(s_NN) = 200 GeV
• Viscous Hydrodynamic Predictions for Nuclear Collisions at the LHC
• Eccentricity fluctuations and elliptic flow at RHIC
• Energy dependence of elliptic flow over a large pseudorapidity range in Au+Au collisions at RHIC
• System size, energy and pseudorapidity dependence of directed and elliptic flow at RHIC
• Hydrodynamic radial and elliptic flow in heavy-ion collisions from AGS to LHC energies
• Elliptic Flow from a Hybrid CGC, Full 3D Hydro and Hadronic Cascade Model
• Elliptic flow in nuclear collisions at the Large Hadron Collider
• Trends in multiparticle production and some "predictions" for pp and PbPb collisions at LHC
• Eccentricity Fluctuation in Initial Conditions of Hydrodynamics
• The centrality dependence of v2/epsilon: the ideal hydro limit and eta/s
• Quantitative and Conceptual Considerations for Extracting the Knudsen Number in Heavy Ion Collisions

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