| Abstract: | The first ($v_1^{ ext{even}}$), second ($v_2$) and third ($v_3$) harmonic
coefficients of the azimuthal particle distribution at mid-rapidity, are
extracted for charged hadrons and studied as a function of transverse momentum
($p_T$) and mean charged particle multiplicity density $langle mathrm{N_{ch}}
angle$ in U+U ($
oots =193$~GeV), Au+Au, Cu+Au, Cu+Cu, $d$+Au and $p$+Au
collisions at $
oots = 200$~GeV with the STAR Detector. For the same $langle
mathrm{N_{ch}}
angle$, the $v_1^{ ext{even}}$ and $v_3$ coefficients are
observed to be independent of collision system, while $v_2$ exhibits such a
scaling only when normalized by the initial-state eccentricity
($varepsilon_2$). The data also show that $ln(v_2/varepsilon_2)$ scales
linearly with $langle mathrm{N_{ch}}
angle^{-1/3}$. These measurements
provide insight into initial-geometry fluctuations and the role of viscous
hydrodynamic attenuation on $v_n$ from small to large collision systems. |
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