椭圆流的通用几何标度
Universal geometrical scaling of the elliptic flow
摘要：
实验观测量中尺度变量的存在为给定物理过程的动力学提供了非常有价值的指示。在过去的几年中，几何缩放，即存在的缩放变量编码的碰撞以及其他外部量的总能量的所有几何信息的搜索，一直非常活跃。这在一定程度上是因为它是彩色玻璃凝聚体形式主义对部分子密度饱和的真正预测之一。在这里，我们扩展这些以前的研究结果的情况下，椭圆流的实验数据。我们找到了一个很好的缩放所有的中心和能量，从RHIC大型强子对撞机，与一个简单的概括以前发现的其他观测量和系统的缩放。有趣的是，光子的情况，在大多数形式主义中很难调和，很好地拟合了标度曲线。我们讨论了可能的解释，这一发现的初始或最终状态的影响。
英文摘要：
The presence of scaling variables in experimental observables provide very valuable indications of the dynamics underlying a given physical process. In the last years, the search for geometric scaling, that is the presence of a scaling variable which encodes all geometrical information of the collision as well as other external quantities as the total energy, has been very active. This is motivated, in part, for being one of the genuine predictions of the Color Glass Condensate formalism for saturation of partonic densities. Here we extend these previous findings to the case of experimental data on elliptic flow. We find an excellent scaling for all centralities and energies, from RHIC to LHC, with a simple generalization of the scaling previously found for other observables and systems. Interestingly the case of the photons, difficult to reconcile in most formalisms, nicely fit the scaling curve. We discuss the possible interpretations of this finding in terms of initial or final state effects.
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