相对论性重离子碰撞中可观测到的末态的痕量初始相互作用
Trace initial interaction from final state observable in relativistic heavy ion collisions
摘要：
为了追踪超相对论性重离子碰撞中各个方位上的初始相互作用，提出了两种方位多重关联模式--相邻关联模式和固定于任意角仓关联模式.用考虑强子再散射的RQMD模型和考虑弦熔化和不考虑弦熔化的AMPT模型对200 GeV的Au + Au碰撞进行了模拟，观察到当碰撞中心由中心向外围移动时，关联模式由面外优先模式逐渐变为面内优先模式，而各向异性集体流v2在所有情况下都保持为正。这种规律性被发现是模型和碰撞能量无关。两个相反的趋势的相关模式，特别是在RHIC能量的平面外的相关模式的存在下，背后的物理进行了讨论。
英文摘要：
In order to trace the initial interaction in ultra-relativistic heavy ion collision in all azimuthal directions, two azimuthal multiplicity-correlation patterns -- neighboring and fixed-to-arbitrary angular-bin correlation patterns -- are suggested. From the simulation of Au + Au collisions at 200 GeV by using the Monte Carlo models RQMD with hadron re-scattering and AMPT with and without string melting, we observe that the correlation patterns change gradually from out-of-plane preferential one to in-plane preferential one when the centrality of collision shifts from central to peripheral, meanwhile the anisotropic collective flow v_2 keeps positive in all cases. This regularity is found to be model and collision energy independent. The physics behind the two opposite trends of correlation patterns, in particular, the presence of out-of-plane correlation patterns at RHIC energy, are discussed.
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