Centrality and transverse momentum dependence of higher-order flow harmonics of identified hadrons in Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV

TL;DR

This paper reports precise measurements of higher-order flow harmonics for identified hadrons in Au+Au collisions at 200 GeV, revealing quark-level collectivity and supporting hydrodynamic modeling of the quark-gluon plasma.

Contribution

It provides detailed flow harmonic data for various hadrons and confirms the validity of number-of-constituent-quark scaling across different centralities.

Findings

Similar flow trends between light and strange hadrons.

Number-of-constituent-quark scaling holds within uncertainties.

Results constrain viscous hydrodynamic models.

Abstract

We present high-precision measurements of elliptic, triangular, and quadrangular flow $v_{2}$, $v_{3}$, and $v_{4}$, respectively, at midrapidity ($|\eta|<1.0$) for identified hadrons $\pi$, $p$, $K$, $\varphi$, $K_s$, $\Lambda$ as a function of centrality and transverse momentum in Au+Au collisions at the center-of-mass energy $\sqrt{s_{\rm NN}}=$ 200 GeV. We observe similar $v_{n}$ trends between light and strange mesons which indicates that the heavier strange quarks flow as strongly as the lighter up and down quarks. The number-of-constituent-quark scaling for $v_{2}$, $v_{3}$, and $v_{4}$ is found to hold within statistical uncertainty for 0-10$\%$, 10-40$\%$ and 40-80$\%$ collision centrality intervals. The results are compared to several viscous hydrodynamic calculations with varying initial conditions, and could serve as an additional constraint to the development of hydrodynamic models.