Parton collisional effect on the conversion of geometry eccentricities into momentum anisotropies in relativistic heavy-ion collisions

TL;DR

This paper investigates how partonic collisions influence the transformation of initial geometric eccentricities into azimuthal flow anisotropies in high-energy heavy-ion collisions, revealing differential effects based on collision frequency.

Contribution

It introduces a detailed analysis of partonic collision effects on flow development and eccentricity evolution using a multi-phase transport model in Pb+Pb collisions.

Findings

Partonic collisions generate elliptic and triangular flows.

Higher collision counts reduce flow conversion efficiency.

Partonic interactions influence initial eccentricity evolution.

Abstract

We explore parton collisional effects on the conversion of geometry eccentricities into azimuthal anisotropies in Pb+Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV using a multi-phase transport model. The initial eccentricity $\varepsilon_{n}$ (n = 2,3) and flow harmonics $v_{n}$ (n = 2,3) are investigated as a function of the number of parton collisions ($N_{coll}$) during the source evolution of partonic phase. It is found that partonic collisions leads to generate elliptic flow $v_{2}$ and triangular flow $v_{3}$ in Pb+Pb collisions. On the other hand, partonic collisions also result in an evolution of the eccentricity of geometry. The collisional effect on the flow conversion efficiency is therefore studied. We find that the partons with larger $N_{coll}$ show a lower flow conversion efficiency, which reflect differential behaviors with respect to $N_{coll}$. It provides an additional insight into the dynamics of the space-momentum transformation during the QGP evolution from a transport model point of view.