2012/08/30 by Wang Meijuan, Meijuan, Wang, Chen Gang +4
Mathematics · Physics and Astronomy · #High-Energy Particle Collisions Research #Statistical Mechanics and Entropy #Stochastic processes and statistical mechanics #hep-ph #nucl-th
paper · pdf · doi:10.48550/arxiv.1208.6105
4 pages, 3 figures, accepted by Chinese Physics C
arxiv created 2012/08/30 · arxiv updated 2012/08/31
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.