Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of π + and π - in heavy-ion collisions
Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of π + and π - in heavy-ion collisions
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DOI：
10.1016/j.physletb.2013.08.003
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发表时间：
2013-03
影响因子：
4.4
通讯作者：
A. Bzdak;P. Bożek
中科院分区：
文献类型：
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作者：
A. Bzdak;P. Bożek
我们讨论了π+和π−椭圆流对逐个事件电荷不对称性的各种贡献，这是最近在RHIC的恒星合作测量到的。结果表明，在一般假设下，在给定的非对称参数A的波动范围内，v2+和v2−之间的差值是A的线性函数，正如在初步数据中所观察到的那样。我们讨论了两种机制，这两种机制与实验数据定性一致，并产生了正确的量级信号。我们随后的流体动力学计算，假设冻结时的局部电荷守恒，对观察到的信号产生了定性和部分定量的理解，因此提供了重离子碰撞中流体动力学模型的详细测试。
We discuss various contributions to the event-by-event charge asymmetry dependence of π+ and π− elliptic flow, recently measured by the STAR Collaboration at RHIC. It is shown that under general assumptions, the difference between v 2+ and v 2− at a given fluctuating value of an asymmetry parameter, A, is a linear function of A, as observed in the preliminary data. We discuss two mechanisms that are qualitatively consistent with the experimental data and result in a signal of the correct order of magnitude. Our subsequent hydrodynamic calculations, assuming local charge conservation at freeze-out, yield a qualitative and partial quantitative understanding of the observed signal, so offering a detailed test of the hydrodynamic model in heavy-ion collisions.