Energy dependence study of directed flow in Au+Au collisions using an improved coalescence in AMPT model

Abstract

The rapidity-odd component of directed flow ($v_1$) of identified hardons (${\pi }^{\pm }$, $K^{\pm }$, $K_S^0$, $p$, $\bar{p}$, $\varphi$, $\Xi$, $\bar{\Xi }$, $\Lambda$, $\bar{\Lambda }$) and partons ($u$, $\bar{u}$, $d$, $\bar{d}$, $s$, $\bar{s}$) in Au+Au collisions at various beam energies ($\sqrt{s_{\mathrm{NN}}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 54.4, 62.4, 200 GeV) using a multi-phase transport model is analyzed. A data driven approach (inspired from the experimental analysis) is performed here to distinguish the transported and produced quarks which are found to have different directed flow values at various collision beam energies. The coalescence sum rule (Number of Constituent Quark scaling) violation is observed at lower energies where hadronic matters dominate. The strange quark ($s$) and $\varphi$ meson slope (d$v_1$/d$y$) show a double sign change around 14.5 GeV, unlike other partons and hadrons. It suggests that strange quark is more sensitive to the softening of Equation of State (EoS).

9 pages, 8 figures, submitted to Phys. Rev. C

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• A Study of the Properties of the QCD Phase Diagram in High-Energy Nuclear Collisions
• Directed flow of $\Lambda$ in high-energy heavy-ion collisions and $\Lambda$ potential in dense nuclear matter
• Collective Excitation in High-Energy Nuclear Collisions -- In Memory of Professor Lianshou Liu
• Anti-flow of Mesons in the High Baryon Density Region
• Directed and elliptic flow of identified hadrons, high-$p_{\mathrm{T}}$ charged hadrons and light nuclei in Au+Au collisions at STAR
• Constraining input parameters of AMPT model with $\varphi$ meson production
• Exploring Electromagnetic Field Effects and Constraining Transport Parameters of QGP using STAR BES-II data
• Measurement of Kaon Directed Flow in Au+Au Collisions in the High Baryon Density Region
• Left-right splitting of elliptic flow due to directed flow in heavy ion collisions
• Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions
• Directed flow of $\Lambda$ from heavy-ion collisions and hyperon puzzle of neutron stars
• System size dependence of charged hadrons directed flow at $\sqrt{s_{NN}}$ = 200 GeV using a multi-phase transport model