Azimuthal anisotropy measurement of (multi-)strange hadrons in Au+Au collisions at $\sqrt{s_{\text{NN}}}$ = 54.4 GeV

Abstract

Azimuthal anisotropy of produced particles is one of the most important observables used to access the collective properties of the expanding medium created in relativistic heavy-ion collisions. In this paper, we present second ($v_2$) and third ($v_3$) order azimuthal anisotropies of $K_S^0$, $\varphi$, $\Lambda$, $\Xi$ and $\Omega$ at mid-rapidity ($|y|<$1) in Au+Au collisions at $\sqrt{s_{\text{NN}}}$ = 54.4 GeV measured by the STAR detector. The $v_2$ and $v_3$ are measured as a function of transverse momentum and centrality. Their energy dependence is also studied. $v_3$ is found to be more sensitive to the change in the center-of-mass energy than $v_2$. Scaling by constituent quark number is found to hold for $v_2$ within 10%. This observation could be evidence for the development of partonic collectivity in 54.4 GeV Au+Au collisions. Differences in $v_2$ and $v_3$ between baryons and anti-baryons are presented, and ratios of $v_3$/$v_2^{3/2}$ are studied and motivated by hydrodynamical calculations. The ratio of $v_2$ of $\varphi$ mesons to that of anti-protons ($v_2(\varphi )/v_2(\bar{p})$) shows centrality dependence at low transverse momentum, presumably resulting from the larger effects from hadronic interactions on anti-proton $v_2$.

12 pages, 14 figures

References in corpus (12)

• Centrality dependence of charged hadron and strange hadron elliptic flow from sqrt(s_NN) = 200 GeV Au+Au collisions
• Partonic flow and $\varphi$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Inclusive charged hadron elliptic flow in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7 - 39 GeV
• Elliptic Flow: A Brief Review
• Experimental evidence for an attractive p-$\varphi$ interaction
• Collision Energy Dependence of Viscous Hydrodynamic Flow in Relativistic Heavy-Ion Collisions
• Measurement of the in-medium phi-meson width in proton-nucleus collisions
• Title Quantum Optics and Heavy Ion Physics
• Azimuthally sensitive correlations in nucleus-nucleus collisions
• $\varphi$ meson transparency in nuclei from $\varphi N$ resonant interactions
• Azimuthal anisotropy measurements of strange and multistrange hadrons in U+U collisions at $\sqrt{s_{NN}}=193$ GeV at the BNL Relativistic Heavy Ion Collider
• A-dependence of phi-meson production in p+A collisions

Cited by in corpus (1)

• Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter