Parton evolution time dependent transverse shape asymmetry in peripheral Pb-Pb and p-Pb collisions at 5.02 TeV

TL;DR

This study uses a multi-phase transport model to analyze how transverse shape asymmetry evolves over time in peripheral Pb-Pb and p-Pb collisions at 5.02 TeV, revealing system-dependent initial spatial asymmetry and system-independent momentum asymmetries.

Contribution

It introduces a detailed simulation of time-dependent transverse asymmetry in heavy-ion collisions, highlighting the role of particle species and momentum in asymmetry evolution.

Findings

Initial spatial asymmetry depends on collision system.

Momentum asymmetries are system-independent.

Transverse asymmetry varies with particle species and momentum.

Abstract

In this paper, we use a multi-phase transport model to simulate the parton evolution time-dependent transverse asymmetry in peripheral Pb-Pb (b=14-15 fm) and p-Pb (b=0-1 fm) collisions at $\sqrt{s_{NN}}$= 5.02 TeV, respectively. The simulated results showed that the initial spatial asymmetry depends on the collision system, while both the initial momentum asymmetry and final momentum asymmetry are independent on the collision system. It is also shown that the final momentum asymmetry is similar to the initial momentum asymmetry. Furthermore, the averaged transverse shape asymmetry, which includes the initial spatial asymmetry, the initial momentum asymmetry, and the final momentum asymmetry, is significantly dependent on the transverse momentum and particle species identity (PID). The PID scales ordering transverse asymmetry indicated that it provides a possible observation for studying the fluctuating droplet properties of quark-gluon plasma, which may produce in heavy-ion collisions.