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Particle species dependence of elliptic flow fluctuations in Pb-Pb collisions at LHC energies in a multiphase transport model

Jie Wan, Chun-Zheng Wang, Yu-Gang Ma, Qi-Ye Shou, Song Zhang

Abstract

The fluctuations of elliptic flow (\vtwo) in relativistic heavy-ion collisions offer a powerful tool to probe the collective behavior and transport properties of the quark-gluon plasma (QGP). The dependence of these fluctuations on particle species further sheds light on the hadronization mechanism. At LHC energies, the ALICE experiment has measured $v_2$ fluctuations for charged pions, kaons, and (anti-)protons via the ratio of \vtwo measured with respect to the spectator plane (\vtwosp) and from the four-particle cumulants (\vtwofour). However, the observed dependencies on transverse momentum and particle type remain not fully understood. In this study, we perform a phenomenological investigation using a multiphase transport (AMPT) model, which allows us to trace the full evolution of flow fluctuations intertwined with the quark coalescence. The results qualitatively reproduce the ALICE measurements and offer deeper insights into the transport dynamics and hadronization of the QGP.

Particle species dependence of elliptic flow fluctuations in Pb-Pb collisions at LHC energies in a multiphase transport model

Abstract

The fluctuations of elliptic flow (\vtwo) in relativistic heavy-ion collisions offer a powerful tool to probe the collective behavior and transport properties of the quark-gluon plasma (QGP). The dependence of these fluctuations on particle species further sheds light on the hadronization mechanism. At LHC energies, the ALICE experiment has measured fluctuations for charged pions, kaons, and (anti-)protons via the ratio of \vtwo measured with respect to the spectator plane (\vtwosp) and from the four-particle cumulants (\vtwofour). However, the observed dependencies on transverse momentum and particle type remain not fully understood. In this study, we perform a phenomenological investigation using a multiphase transport (AMPT) model, which allows us to trace the full evolution of flow fluctuations intertwined with the quark coalescence. The results qualitatively reproduce the ALICE measurements and offer deeper insights into the transport dynamics and hadronization of the QGP.

Paper Structure

This paper contains 7 sections, 6 equations, 5 figures, 1 table.

Table of Contents

  1. Introduction
  2. Model and analysis method
  3. Results and discussions
  4. The $p_{\rm T}$ dependent $v_2 \{2\}$, $v_2 \{4\}$ and $v_2 \{\rm SP\}$ for $\pi$, $K$, and $p$
  5. Crosscheck with event mixing and selected $\Psi_{\rm PP}$
  6. Comparison with eccentricity and centrality dependence of slope, intercept and double ratio
  7. Summary

Figures (5)

  • Figure 1: (Color online) The $p_{\rm T}$ dependent $v_2 \{2\}$, $v_2 \{4\}$ and $v_2 \{\rm SP\}$ for $u$, $d$ and $s$ quarks, in the initial stage before ZPC in 30-40% AMPT Pb-Pb collisions.
  • Figure 2: (Color online) The $p_{\rm T}$ dependent $v_2 \{2\}$, $v_2 \{4\}$ and $v_2 \{\rm SP\}$ and their ratios for $u$, $d$ and $s$ quarks (panels a and d) and for $\pi, K, p$ (panels b, c, e, f), in three evolution stages in 30-40% AMPT Pb-Pb collisions.
  • Figure 3: (Color online) Same as Fig. \ref{['fig:fig_v2']}, but with event mixing applied.
  • Figure 4: (Color online) The $p_{\rm T}$ dependent $v_2 \{2\}$, $v_2 \{4\}$ and $v_2 \{\rm SP\}$ and their ratios for inclusive charged hadrons in three $|\Psi_{\rm RP} - \Psi_{\rm PP}|$ conditions in 30-40% AMPT Pb-Pb collisions.
  • Figure 5: (Color online) The centrality dependence of $v_2\xspace \{\rm SP\}$/$v_2\xspace \{4\}$, slope, intercept and double ratio to $h$ for $\pi, K, p$ in AMPT Pb-Pb collisions. The $v_2\xspace \{\rm SP\}$/$v_2\xspace \{4\}$ is also compared with $\varepsilon_2 \{\rm RP\}$/$\varepsilon_2 \{4\}$ is panel (a).