Higher flow harmonics in heavy ion collisions from STAR

Abstract

We report STAR measurements relating to higher flow harmonics including the centrality dependence of two- and four-particle cumulants for harmonics 1–6. Two-particle correlation functions versus Δη and Δϕ are presented for pT and number correlations. We find the power spectra (Fourier transforms of the correlation functions) for central collisions drop quickly for higher harmonics. The Δη dependence of v3{2}2 and pT and the centrality dependence of v2 and v3 are studied. Trends are consistent with expectations from models including hot-spots in the initial energy density and an expansion phase. We also present v3 and v2{2}2 − v2{4}2 versus .