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arXiv 1408.0098nucl-thnucl-ex
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集体流激发函数能告诉我们关于夸克-胶子等离子体的什么

What the collective flow excitation function can tell about the quark-gluon plasma

Jussi Auvinen, Jan Steinheimer, Hannah Petersen

摘要:

最近的来自RHIC束流能量扫描(BES)的STAR数据表明,净质子定向流v1的中快度斜率dv 1/dy在碰撞能量范围7.7 - 39 GeV内改变了两次符号。为了研究这一现象,我们研究碰撞能量依赖的V1利用玻尔兹曼+流体动力学混合模型。动态演化的初始和最终状态的计算表明,与早期的纯流体预测相比,具有交叉的状态方程和具有一阶相变的状态方程之间没有质的差异。此外,我们的椭圆流V2的分析表明,预平衡运输动力学部分补偿减少椭圆流生产在流体动力学阶段在较低的能量,这导致定性协议与星BES结果在midcentral碰撞。在我们的模型中没有发现来自运输的补偿,综合v3,从sqrt(sNN)= 27 GeV的约0.02下降到sqrt(sNN)= 7.7 GeV的约0.005在midcentral碰撞。

英文摘要:

Recent STAR data from the RHIC beam energy scan (BES) show that the midrapidity slope dv1/dy of the directed flow v1 of net-protons changes sign twice within the collision energy range 7.7 - 39 GeV. To investigate this phenomenon, we study the collision energy dependence of v1 utilizing a Boltzmann + hydrodynamics hybrid model. Calculations with dynamically evolved initial and final state show no qualitative difference between an equation of state with a cross-over and one with a first-order phase transition, in contrast to earlier pure fluid predictions. Furthermore, our analysis of the elliptic flow v2 shows that pre-equilibrium transport dynamics are partially compensating for the diminished elliptic flow production in the hydrodynamical phase at lower energies, which leads to a qualitative agreement with STAR BES results in midcentral collisions. No compensation from transport is found in our model for integrated v3, which decreases from approx 0.02 at sqrt(sNN) = 27 GeV to approx 0.005 at sqrt(sNN) = 7.7 GeV in midcentral collisions.

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