Long-range collectivity in small collision-systems with two- and four-particle correlations @ STAR

New STAR differential and integral v_2,3 measurements that explicitly account for non-flow contributions, are reported for p/d/³He+Au, collisions at s_NN=200GeV. The measurements, which leverage the two-particle correlators for p/d/³He+Au and minimum-bias p+p collisions in tandem with three well established methods of non-flow subtraction, are observed to be method-independent. For comparable multiplicities, they further indicate system-independent v₂{2} and v₃{2} values that are consistent with the critical role of both “size” (N_ch) and the subnucleonic-fluctuations-driven eccentricities ε_2,3, but are inconsistent with the notion of shape engineering in p/d/³He+Au collisions. The scaling function derived from the measurements, confirm the important role of final-state effects across a broad spectrum of collision-system sizes and energies, and suggests an increase in η/s(T,μ_B) for small collision-systems.