RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA and Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.
Phys Rev Lett. 2014 Dec 19;113(25):252301. doi: 10.1103/PhysRevLett.113.252301. Epub 2014 Dec 15.
Using a multiphase transport model (AMPT) we calculate the elliptic v_{2} and triangular v_{3} Fourier coefficients of the two-particle azimuthal correlation function in proton-nucleus (p-Pb) and peripheral nucleus-nucleus (Pb-Pb) collisions. Our results for v_{3} are in a good agreement with the CMS data collected at the Large Hadron Collider. The v_{2} coefficient is very well described in p-Pb collisions and is underestimated for higher transverse momenta in Pb-Pb interactions. The characteristic mass ordering of v_{2} in p-Pb is reproduced, whereas for v_{3}, this effect is not observed. We further predict the pseudorapidity dependence of v_{2} and v_{3} in p-Pb and observe that both are increasing when going from a proton side to a Pb-nucleus side. Predictions for the higher-order Fourier coefficients, v_{4} and v_{5}, in p-Pb are also presented.
我们使用多相输运模型（AMPT）计算了质子-核（p-Pb）和外围核-核（Pb-Pb）碰撞中两粒子方位关联函数的椭圆 v_{2}和三角 v_{3}傅里叶系数。我们得到的 v_{3}结果与在大型强子对撞机上收集的 CMS 数据吻合较好。在 p-Pb 碰撞中，v_{2}系数得到了很好的描述，而在 Pb-Pb 相互作用中，当横向动量较高时，v_{2}系数被低估。在 p-Pb 中，v_{2}的特征质量排序得到了重现，而对于 v_{3}，则没有观察到这种效应。我们进一步预测了 p-Pb 中 v_{2}和 v_{3}的赝快度依赖性，并观察到它们从质子侧到 Pb 核侧都在增加。我们还给出了 p-Pb 中更高阶傅里叶系数 v_{4}和 v_{5}的预测。
