Eccentricity and elliptic flow at fixed centrality in Au+Au collisions at sqrt(s_NN)=200GeV in AMPT

2012/08/30 by Gang Chen, Meijuan, Wang, Gang, Chen +2
Physics and Astronomy · Mathematics · #High-Energy Particle Collisions Research #Statistical Mechanics and Entropy #Stochastic processes and statistical mechanics

paper · pdf · doi:10.48550/arxiv.1208.6105

Abstract

To reduce the effect of the fluctuations of initial geometrical shape, elliptic flow are studied at fixed centrality in Au+Au collision at √s_{\rm NN}=200GeV. It is observed with the participant increasing, elliptic flow has an increase and a decrease at different fixed impact parameter, but not a trivial fluctuation. It is analyzed that the initial space anisotropy dominates the participant dependence of elliptic flow in near-central collisions(b=5fm) and mid-central collisions(b=8fm), while the interaction between particles can mainly answer for the behavior of elliptic flow in peripheral collisions(b=12fm). To distinguish the pure geometrical effect, elliptic flow scaled by initial eccentricity is studied. It is found that the ratio v₂/ε increases with participant and reaches a saturation when the participant is large enough, indicating that the collision system reach the local equilibrium.

Related

• The eccentricities of flow - elliptic flow fluctuations and evidence for transverse localization in the initial state of the matter in relativistic heavy ion collisions
• Energy Dependence of Elliptic Flow Ratio v₂^PP/v₂^RP in Heavy-ion Collisions Using the AMPT Model
• Elliptic flow of charged hadrons in d+Au collisions at √s_NN = 200 GeV using a multi-phase transport model
• Exploring the centrality dependence of elliptic and triangular flows
• Eccentricity fluctuations and its possible effect on elliptic flow measurements