论文标题
通过事件形状工程探测最初的几何各向异性和最终方位角各向异性的重型离子碰撞碰撞。
Probing initial geometrical anisotropy and final azimuthal anisotropy in heavy-ion collisions at Large Hadron Collider energies through event-shape engineering
论文作者
论文摘要
认可各向异性流量，其作用来自核重叠区域的初始状态几何形状和波动。最终状态粒子的椭圆流（$ v_2 $）和三角形流量（$ v_3 $）的系数有望分别受参与者的偏心率（$ \ varepsilon_2 $）和三角形（$ \ varepsilon_3 $）的影响。在这项工作中，我们研究$ v_2 $，$ v_3 $，$ \ varepsilon_2 $，$ \ varepsilon_3 $以及它们之间的相关性与多相运输模型（AMPT）框架的事件拓扑相关。在本研究中，我们使用横向球和减少流量为事件形状分类器。横向球体具有基于几何形状（即码头和各向同性）分离事件的独特能力，分别与高能物理学中的颗粒产生的颗粒产生和非PQCD结构域有关。我们使用两粒子相关方法研究不同的各向异性流量系数。我们与更广泛使用的事件形状分类器（降低流量矢量（$ q_n $））面对横向球，发现它们之间具有显着的（反）相关性。我们观察到$ v_2 $，$ v_3 $和$ \ varepsilon_2 $的球形性依赖性很大。这项工作还解决了$ v_2 $和$ v_3 $之间的横向动量依赖性交叉点，这在不同的中心性和球形百分位数方面有所不同。
Anisotropic flow is accredited to have effects from the initial state geometry and fluctuations in the nuclear overlap region. The elliptic flow ($v_2$) and triangular flow ($v_3$) coefficients of the final state particles are expected to have influenced by eccentricity ($\varepsilon_2$) and triangularity ($\varepsilon_3$) of the participants, respectively. In this work, we study $v_2$, $v_3$, $\varepsilon_2$, $\varepsilon_3$ and the correlations among them with respect to event topology in the framework of a multi-phase transport model (AMPT). We use transverse spherocity and reduced flow vector as event shape classifiers in this study. Transverse spherocity has the unique ability to separate events based on geometrical shapes, i.e., jetty and isotropic, which pertain to pQCD and non-pQCD domains of particle production in high-energy physics, respectively. We use the two-particle correlation method to study different anisotropic flow coefficients. We confront transverse spherocity with a more widely used event shape classifier -- reduced flow vector ($q_n$) and they are found to have significant (anti-)correlations among them. We observe significant spherocity dependence on $v_2$, $v_3$ and $\varepsilon_2$. This work also addresses transverse momentum dependent crossing points between $v_2$ and $v_3$, which varies for different centrality and spherocity percentiles.
