Final state effects on charge asymmetry of pion elliptic flow in high-energy heavy-ion collisions
Final state effects on charge asymmetry of pion elliptic flow in high-energy heavy-ion collisions
复制标题
高能重离子碰撞中π介子椭圆流电荷不对称性的终态效应
DOI：
10.1016/j.physletb.2014.06.074
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发表时间：
2014
影响因子：
4.4
通讯作者：
Ma Guo-Liang
中科院分区：
文献类型：
--
作者：
Ma Guo-Liang
在考虑弦熔化机制和引入初始电四极矩的多相输运模型中，计算了正负π介子椭圆流的差别。由于部分子级联将初始的电四极分布转化为最终的电荷依赖的椭圆流，得到了Δ v2 = v2（π−）− v2（π+）对Ach =（N+− N−）/（N++ N−）的线性依赖关系的斜率参数r.斜率参数r被发现增加强子化的合并，并减少共振衰变。斜率参数r对初始电四极矩百分比和中心度仓都很敏感，因此对于RHIC顶能的Au+ Au碰撞，得到了手征磁波四极矩的一个有用约束.
Within a multi-phase transport (AMPT) model with the string melting mechanism and imported initial electric quadrupole moment, the difference between the elliptic flow of positive and negative pions is calculated. The slope parameter r of the linear dependence of Δ v 2= v 2 (π−)− v 2 (π+) on A ch=(N+− N−)/(N++ N−) is yielded owing to the parton cascade, which converts the initial electric quadrupole distribution into the final charge-dependent elliptic flow. The slope parameter r is found to be increased by the hadronization given by the coalescence, and decreased by the resonance decays. The slope parameter r is very sensitive to both the initial electric quadrupole percentage and centrality bin and consequently a helpful constraint on the quadrupole moment of the chiral magnetic wave is obtained for Au+ Au collisions at the top RHIC energy.