Event topology and global observables in heavy-ion collisions at the Large Hadron Collider

Suraj Prasad; Neelkamal Mallick; Debadatta Behera; Raghunath Sahoo; Sushanta Tripathy

doi:10.1038/s41598-022-07547-z

Event topology and global observables in heavy-ion collisions at the Large Hadron Collider

Sci Rep. 2022 Mar 10;12(1):3917. doi: 10.1038/s41598-022-07547-z.

Authors

Suraj Prasad¹, Neelkamal Mallick¹, Debadatta Behera¹, Raghunath Sahoo^{2

3}, Sushanta Tripathy⁴

Affiliations

¹ Department of Physics, Indian Institute of Technology Indore, Simrol, Indore, 453552, India.
² Department of Physics, Indian Institute of Technology Indore, Simrol, Indore, 453552, India. Raghunath.Sahoo@cern.ch.
³ CERN, CH 1211, Geneva 23, Switzerland. Raghunath.Sahoo@cern.ch.
⁴ INFN - sezione di Bologna, via Irnerio 46, 40126, Bologna, BO, Italy.

Abstract

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.