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arXiv 1401.2265nucl-thhep-phnucl-ex
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能量$\sqrt{s_{NN}}=$ 2.7- 39 GeV重离子碰撞中的椭圆流

Elliptic Flow in Heavy-Ion Collisions at Energies $\sqrt{s_{NN}}=$ 2.7--39 GeV

Yu. B. Ivanov, A. A. Soldatov

备注：
10 pages, 5 figures. Version published in Phys. Rev. C
发表信息：
Phys. Rev. C 91, 024914 (2015)
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摘要：

在入射能量为2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV的宽范围内，计算了中快度带电粒子的横动量积分椭圆流、$v_2$（带电）和Au+Au碰撞中确定的强子的横动量积分椭圆流.模拟是在一个三流体模型采用三种不同的状态方程（EoS的）：一个纯粹的强子EoS和两个版本的EoS涉及解除禁闭过渡-一阶相变和一个平滑的交叉。本模拟证明了$v_2$（带电）对EoS的低灵敏度。所有考虑的情况下同样很好地再现最近的STAR数据$v_2$（收费）中中心金+金碰撞，并正确地描述其变化的符号在入射能量降低到$\sqrt{s_{NN}}\approx$ 3.5 GeV以下。预测的综合椭圆流的各种物种表现出较强的依赖于EoS。反重子对EoS有明显的敏感性，$K^-$介子的敏感性较小。特别是，反重子的$v_2$激发函数在Kolb，Sollfrank和Heinz预测的解除禁闭的情况下表现出非单调性。然而，在$\sqrt{s_{NN}}\leq$ 10 GeV的反重子的低多重数导致它们的$v_2$的大的波动，这可能会洗掉这种非单调性。

英文摘要：

The transverse-momentum integrated elliptic flow of charged particles at midrapidity, $v_2$(charged), and that of identified hadrons from Au+Au collisions are computed in a wide range of incident energies 2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The simulations are performed within a three-fluid model employing three different equations of state (EoS's): a purely hadronic EoS and two versions of the EoS involving the deconfinement transition---a first-order phase transition and a smooth crossover one. The present simulations demonstrate low sensitivity of $v_2$(charged) to the EoS. All considered scenarios equally well reproduce recent STAR data on $v_2$(charged) for mid-central Au+Au collisions and properly describe its change of sign at the incident energy decrease below $\sqrt{s_{NN}}\approx$ 3.5 GeV. The predicted integrated elliptic flow of various species exhibits a stronger dependence on the EoS. A noticeable sensitivity to the EoS is found for anti-baryons and, to a lesser extent, for $K^-$ mesons. In particular, the $v_2$ excitation functions of anti-baryons exhibit a non-monotonicity within the deconfinement scenarios that was predicted by Kolb, Sollfrank and Heinz. However, low multiplicities of anti-baryons at $\sqrt{s_{NN}}\leq$ 10 GeV result in large fluctuations of their $v_2$ which may wash out this non-monotonicity.

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