High order flow harmonics of identified hadrons in 2.76 A TeV Pb+Pb collisions

TL;DR

This study uses the iEBE-VISHNU hybrid model to analyze higher order flow harmonics of identified hadrons in Pb+Pb collisions at 2.76 A TeV, successfully reproducing experimental data and exploring the evolution of flow harmonic mass ordering.

Contribution

It introduces detailed modeling of flow harmonic mass ordering across centralities and investigates the development of flow patterns during hadronic evolution.

Findings

The model accurately describes flow harmonics below 2 GeV for 20-30 ext{ extperthousand} centrality.

Mass-ordering patterns of flow harmonics are consistent across different centralities.

Flow harmonic mass splitting evolves during hadronic evolution, as shown by comparison with pure hydrodynamics.

Abstract

Using iEBE-VISHNU hybrid model with the AMPT initial conditions, we study the higher order flow harmonics of identified hadrons in 2.76 A TeV Pb+Pb collisions. Comparison with the recent ALICE measurements at 20-30\% centrality shows that our calculations nicely describe the data below 2 GeV, especially for the $v_2$, $v_3$ and $v_4$ mass-orderings among pions, kaons and protons. We also extended the calculations to other centrality bins, which presents similar mass-ordering patterns for these flow harmonics as the ones observed at 20-30\% centrality. In the later part of this article, we explore the development of $v_n$ mass ordering/splitting during the hadronic evolution through the comparison runs from iEBE-VISHNU hybrid model and pure hydrodynamics with different decoupling temperatures.