System Size, Energy, Pseudorapidity, and Centrality Dependence of Elliptic Flow

2006/10/24 by B. Alver, B. B. Back, M. D. Baker +65 · 9 citations
Physics and Astronomy · #Centrality #Charged particle #Combinatorics #Eccentricity (behavior) #Elliptic flow #Energy (signal processing) #Flow (mathematics) #Geometry #Heavy ion #High-Energy Particle Collisions Research #Impact parameter #Ion #Mechanics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudorapidity #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Relativistic Heavy Ion Collider #Scaling #nucl-ex

paper · pdf · doi:10.1103/physrevlett.98.242302

published as Phys.Rev.Lett.98:242302,2007

arxiv created 2006/10/24 · openalex publication_date 2007/06/15 · arxiv updated 2019/08/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

This Letter presents measurements of the elliptic flow of charged particles as a function of pseudorapidity and centrality from Cu-Cu collisions at 62.4 and 200 GeV using the PHOBOS detector at the Relativistic Heavy Ion Collider. The elliptic flow in Cu-Cu collisions is found to be significant even for the most central events. For comparison with the Au-Au results, it is found that the detailed way in which the collision geometry (eccentricity) is estimated is of critical importance when scaling out system-size effects. A new form of eccentricity, called the participant eccentricity, is introduced which yields a scaled elliptic flow in the Cu-Cu system that has the same relative magnitude and qualitative features as that in the Au-Au system.

Citations

• Elliptic Flow of Identified Hadrons inAu+AuCollisions atsNN=200 GeV
• Highly Sensitive Centrality Dependence of Elliptic Flow: A Novel Signature of the Phase Transition in QCD
• Saturation of Azimuthal Anisotropy in Au+Au Collisions at sNN=62–200 GeV

Cited by

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• Relating multihadron production in hadronic and nuclear collisions
• Direct real photons in relativistic heavy ion collisions
• Bulk viscosity and cavitation in boost-invariant hydrodynamic expansion
• Relative flow fluctuations as a probe of initial state fluctuations
• Hydrodynamic modelling for relativistic heavy-ion collisions at RHIC and LHC