Beam-energy and collision-system dependence of the linear and mode-coupled flow harmonics from STAR

Abstract

Recent measurements and hydrodynamic model calculations suggest that the higher-order flow coefficients $v_4$ and $v_5$ have two contributions: a linear contribution driven by the initial-state eccentricities, ${\epsilon }_n$, and a mode-coupled contribution derived from the lower-order eccentricity coefficients ${\epsilon }_2$ and ${\epsilon }_3$. Measurements of these two contributions to $v_4$ and $v_5$ provide crucial insights to discern initial-state models and to constrain the temperature-dependent specific shear viscosity, $\eta /s$, of the plasma produced in heavy-ion collisions. In this work, we have employed the two-subevents cumulant technique to provide the first beam-energy and collision-system dependence of the linear and mode-coupled contributions to the higher-order flow harmonics. Our results are shown and discussed for several centrality intervals for U+U collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$= 193 GeV, Au+Au collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$=200, and 54.4 GeV and Cu+Au collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$=200 GeV. The results are compared with similar studies performed by the ALICE experiment at LHC.

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Cited by in corpus (4)

• Characterizing the initial and final state effects of relativistic nuclear collisions
• A model investigation of the longitudinal broadening of the transverse momentum two-particle correlator
• Azimuthal dependence of two-particle transverse momentum current correlations
• Investigations of the linear and non-linear flow harmonics using the A Multi-Phase Transport model