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arXiv 1107.3587nucl-th
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NEXSPHERIO模型中两粒子动量关联的纵向依赖性

Longitudinal dependence of two-particle momentum correlations from NEXSPHERIO model

Monika Sharma, Claude Pruneau, Sean Gavin, Jun Takahashi, R. Derradi de Souza, T. Kodama

备注：
8 pages, 5 figures, updated version based on PRC referee's comments
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摘要：

两粒子动量关联的快度依赖性可以用来探测RHIC重核碰撞中产生的液体的粘性。我们重新审视这个探头在最近的实验分析的方位角的依赖性的数量相关性，这表明在这些相关性的流体动力流传播的初始状态波动的重要性。NEXSPHERIO模型将波动的初始条件与无粘性流体动力学演化相结合，事实上，已被证明可以描述方位角相关性。利用该模型计算了$\sqrt{s_{NN}} = $~200 GeV低横动量Au + Au碰撞中的数密度关联$R_{2}$和动量流关联函数{\it C}. {\it C}对碰撞动力学的细节敏感。其纵向宽度预计会在粘性效应的影响下变宽，并在存在相当大的径向流的情况下变窄。NEXSPHERIO模型定性描述了$R_2$和{\it C}观测量的近侧脊状结构的出现，我们发现，它预测了纵向窄的近侧峰的这些关联函数的参与者的数量增加，与最近的观测相比，由STAR合作的显着扩大，在大多数中心碰撞相对于外围碰撞。

英文摘要：

The rapidity dependence of two-particle momentum correlations can be used to probe the viscosity of the liquid produced in heavy nuclei collisions at RHIC. We reexamine this probe in light of the recent experimental analyses of the azimuthal-angle dependence of number correlations, which demonstrate the importance of initial state fluctuations propagated by hydrodynamic flow in these correlations. The NEXSPHERIO model combines fluctuating initial conditions with viscosity-free hydrodynamic evolution and, indeed, has been shown to describe azimuthal correlations. We use this model to compute the number density correlation $R_{2}$ and the momentum current correlation function {\it C}, at low transverse momentum in Au+Au collisions at $\sqrt{s_{NN}} = $~200 GeV. {\it C} is sensitive to details of the collision dynamics. Its longitudinal width is expected to broaden under the influence of viscous effects and narrow in the presence of sizable radial flow. While NEXSPHERIO model qualitatively describes the emergence of a near-side ridge-like structure for both the $R_2$ and {\it C} observables, we find that it predicts a longitudinal narrowing of the near side peak of these correlation functions for increasing number of participants in contrast with recent observations by the STAR Collaboration of a significant broadening in most central collisions relative to peripheral collisions.

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