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The first ($v_1^{\text{even}}$), second ($v_2$) and third ($v_3$) harmoniccoefficients of the azimuthal particle distribution at mid-rapidity, areextracted for charged hadrons and studied as a function of transverse momentum($p_T$) and mean charged particle multiplicity density $\langle \mathrm{N_{ch}}\rangle$ in U+U ($\roots =193$~GeV), Au+Au, Cu+Au, Cu+Cu, $d$+Au and $p$+Aucollisions at $\roots = 200$~GeV with the STAR Detector. For the same $\langle\mathrm{N_{ch}} \rangle$, the $v_1^{\text{even}}$ and $v_3$ coefficients areobserved to be independent of collision system, while $v_2$ exhibits such ascaling only when normalized by the initial-state eccentricity($\varepsilon_2$). The data also show that $\ln(v_2/\varepsilon_2)$ scaleslinearly with $\langle \mathrm{N_{ch}} \rangle^{-1/3}$. These measurementsprovide insight into initial-geometry fluctuations and the role of viscoushydrodynamic attenuation on $v_n$ from small to large collision systems.

Azimuthal harmonics in small and large collision systems at RHIC top energies