Some insights on the partonic collectivity in heavy-ion collisions

TL;DR

This paper discusses the transition from hadronic to partonic collectivity in heavy-ion collisions, highlighting how elliptic flow and NCQ scaling serve as signatures of medium evolution and QGP formation.

Contribution

It provides new insights into the energy-dependent behavior of elliptic flow and NCQ scaling, indicating the onset of partonic collectivity at higher collision energies.

Findings

At low energies ($rac{s}{NN}} q 4.0$ GeV), $v_2$ may be negative and NCQ scaling breaks down.

Beyond 4.0 GeV, $v_2$ becomes positive and NCQ scaling gradually restores.

The transition signals the increasing importance of partonic interactions and the emergence of QGP-like properties.

Abstract

Elliptic flow and Number of Constituent Quarks scaling provide crucial insights into the underlying dynamics and degrees of freedom in heavy-ion collisions. This article provides some insights on the transition from hadronic to partonic collectivity, revealing possible key signatures of medium evolution. At low energies around ($\sqrt{s_{\rm NN}} \leq 4.0$ GeV), $v_2$ may be negative and NCQ scaling might break down. We expect that as the collision energy rises beyond 4.0 GeV, $v_2$ may become positive and NCQ scaling gradually restores. The transition in $v_2$ behavior, coupled with the breakdown and restoration of NCQ scaling, highlights the increasing significance of partonic interactions at higher energies, marking the onset of partonic collectivity and the emergence of quark-gluon plasma (QGP)-like properties.