arXiv 2110.040982021-10-08hep-phhep-exnucl-exnucl-th

用多相输运模型研究LHC重离子碰撞中方位各向异性的横向球速依赖性

Transverse spherocity dependence of azimuthal anisotropy in heavy-ion collisions at the LHC using a multi-phase transport model

Neelkamal Mallick, Raghunath Sahoo, Sushanta Tripathy, Antonio Ortiz

备注：: Presented in LHCP-2021 conference. To appear in PoS

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摘要：

横向球速（$S_0$）是事件形状观测量之一，在小型碰撞系统（如LHC上的质子-质子碰撞）中已被成功地研究，并被用作分离突堤事件和各向同性事件的工具。它有一种独特的能力，可以根据事件的几何形状来区分它们。在这项工作中，我们报告的第一个实施的横向球速度在重离子碰撞使用多相输运模型（AMPT）。我们对重离子碰撞中产生的带电粒子的方位各向异性随横向球速（$S_0$）的变化进行了广泛的研究。采用两粒子相关（2 PC）方法，对$\sqrt{s_{\rm NN}}$ = 5.02 TeV的高$S_0$、$S_0$积分和低$S_0$积分的Pb-Pb碰撞中不同中心度类的椭圆流（$v_2$）进行了估算.我们发现，横向球速成功地区分重离子碰撞事件拓扑结构的基础上，他们的几何形状，即，球度的高值和低值。高$S_0$事件具有接近零的椭圆流，而低$S_0$事件对球度积分事件的椭圆流贡献显著。

英文摘要：

One of the event shape observables, the transverse spherocity ($S_0$), has been studied successfully in small collision systems such as proton-proton collisions at the LHC as a tool to separate jetty and isotropic events. It has a unique capability to distinguish events based on their geometrical shapes. In this work, we report the first implementation of transverse spherocity in heavy-ion collisions using a multi-phase transport model (AMPT). We have performed an extensive study of azimuthal anisotropy of charged particles produced in heavy-ion collisions as a function of transverse spherocity ($S_0$). We have followed the two-particle correlation (2PC) method to estimate the elliptic flow ($v_2$) in different centrality classes in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV for high-$S_0$, $S_0$-integrated and low-$S_0$ events. We found that transverse spherocity successfully differentiates heavy-ion collisions event topology based on their geometrical shapes, i.e., high and low values of spherocity. The high-$S_0$ events have nearly zero elliptic flow, while the low-$S_0$ events contribute significantly to the elliptic flow of spherocity-integrated events.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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