arXiv 1409.21602014-09-07nucl-thhep-phnucl-ex

超相对论$^3$ He-Au碰撞中的集体流

Collective flow in ultrarelativistic $^3$He-Au collisions

Piotr Bozek, Wojciech Broniowski

DOI：: 10.1016/j.physletb.2014.11.006

摘要：

在RHIC能区超相对论$^3$ He-Au碰撞中，由于$^3$ He中核子组态的三角形排列，三角形流得到增强.在Glauber Monte Carlo模型中研究了火球的偏心率，发现由于抛射体$^3$ He的形状是拉长的三角形，所产生的火球具有较大的椭圆率和较小的三角度。三角形性对中心性的依赖性很弱，因此不能从三角形流$v_3$的中心性依赖性中提取，因为它受流体动力响应的中心性依赖性支配。我们建议看看的比率$v_n\{4\}/v_n\{2\}$，其中的流体动力学响应取消的不确定性的中心依赖性，并显示几何驱动的集体流的基本签名是提高的比率$v_3\{4\}/v_3\{2\}$与参与的核子的中心小于10%。

英文摘要：

The triangular flow in ultrarelativistic $^3$He-Au collisions at RHIC energies is enhanced due to the triangular arrangement of the nucleon configurations in $^3$He. We study the fireball eccentricities in the Glauber Monte Carlo model and find that since the configurations of the projectile $^3$He are elongated triangles, the created fireball has a large ellipticity and a smaller triangularity. The dependence of the triangularity on centrality is weak, so it cannot be extracted from the centrality dependence of the triangular flow $v_3$, as it is dominated by the centrality dependence of the hydrodynamic response. We propose to look at the centrality dependence of the ratio $v_n\{4\}/v_n\{2\}$, where the uncertainties from the hydrodynamic response cancel, and show that the basic signature of the geometry-driven collective flow is the raise of the ratio $v_3\{4\}/v_3\{2\}$ with the number of participant nucleons for centralities less than 10%.

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