Prasad Suraj, Mallick Neelkamal, Behera Debadatta, Sahoo Raghunath, Tripathy Sushanta
Department of Physics, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.
CERN, CH 1211, Geneva 23, Switzerland.
Sci Rep. 2022 Mar 10;12(1):3917. doi: 10.1038/s41598-022-07547-z.
Particle production and event topology are very strongly correlated in high-energy hadronic and nuclear collisions. Event topology is decided by the underlying particle production dynamics and medium effects. Transverse spherocity is an event shape observable, which has been used in pp and heavy-ion collisions to separate the events based on their geometrical shapes. It has the unique capability to distinguish between jetty and isotropic events. In this work, we have implemented transverse spherocity in Pb-Pb collisions at [Formula: see text] = 5.02 TeV using A Multi-Phase Transport Model (AMPT). While awaiting for experimental explorations, we perform a feasibility study of transverse spherocity dependence of some of the global observables in heavy-ion collisions at the Large Hadron Collider energies. These global observables include the Bjorken energy density ([Formula: see text]), squared speed of sound ([Formula: see text]) in the medium and the kinetic freeze-out properties for different collision centralities. The present study reveals about the usefulness of event topology dependent measurements in heavy-ion collisions.
在高能强子碰撞和核碰撞中,粒子产生与事件拓扑结构紧密相关。事件拓扑结构由潜在的粒子产生动力学和介质效应决定。横向球度是一种可观测的事件形状,已在质子-质子碰撞和重离子碰撞中用于根据事件的几何形状对其进行区分。它具有区分喷射状事件和各向同性事件的独特能力。在这项工作中,我们使用多相输运模型(AMPT)在质心能量√s = 5.02 TeV的铅-铅碰撞中实现了横向球度。在等待实验探索的同时,我们对大型强子对撞机能量下重离子碰撞中一些全局可观测量对横向球度的依赖性进行了可行性研究。这些全局可观测量包括比约肯能量密度(εB)、介质中的声速平方(c s 2)以及不同碰撞中心度下的动力学冻结特性。本研究揭示了重离子碰撞中依赖事件拓扑结构测量的有用性。