Chinese Physics C > 2013, Vol. 37 > Issue(1): 014104 DOI: 10.1088/1674-1137/37/1/014104

Eccentricity and elliptic flow at fixed centrality in Au+Au collisions at^sNN=200 GeV in AMPT model

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In this paper, elliptic flow is studied at fixed centrality in Au+Au collision at √ s_NN=200 GeV in the AMPT model. It is observed that with the participant increasing, elliptic flow has an increase or a decrease at different fixed impact parameter, but it does not have a trivial fluctuation. It is analyzed that the initial space anisotropy dominates the participant dependence of elliptic flow in near-central collisions( b=5 fm) and mid-central collisions( b=8 fm), while the interaction between particles can mainly answer for the behavior of elliptic flow with participant in peripheral collisions ( b=12 fm). To distinguish the pure geometrical effect, elliptic flow scaled by initial eccentricity is studied. It is found that the ratio v ₂/ εincreases with participant and reaches a saturation when the participant is large enough, indicating that the collision system may reach the local equilibrium.

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WANG Mei-Juan, CHEN Gang and WU Yuan-Fang. Eccentricity and elliptic flow at fixed centrality in Au+Au collisions at ^sNN=200 GeV in AMPT model[J]. Chinese Physics C, 2013, 37(1): 014104. doi: 10.1088/1674-1137/37/1/014104

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Received: 2012-05-18
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Eccentricity and elliptic flow at fixed centrality in Au+Au collisions at^sNN=200 GeV in AMPT model

Corresponding author:WANG Mei-Juan,

Received Date:2012-05-18
Accepted Date:1900-01-01
Available Online:2013-01-05

Abstract:In this paper, elliptic flow is studied at fixed centrality in Au+Au collision at √s_NN=200 GeV in the AMPT model. It is observed that with the participant increasing, elliptic flow has an increase or a decrease at different fixed impact parameter, but it does not have a trivial fluctuation. It is analyzed that the initial space anisotropy dominates the participant dependence of elliptic flow in near-central collisions(b=5 fm) and mid-central collisions(b=8 fm), while the interaction between particles can mainly answer for the behavior of elliptic flow with participant in peripheral collisions (b=12 fm). To distinguish the pure geometrical effect, elliptic flow scaled by initial eccentricity is studied. It is found that the ratiov₂/εincreases with participant and reaches a saturation when the participant is large enough, indicating that the collision system may reach the local equilibrium.