Systematic investigation of partonic collectivity through centrality dependence of elliptic flow of multi-strange hadrons in Au + Au collisions at image in STAR

We present the measurement of centrality dependence of multi-strange hadrons (image and ϕ) elliptic flow (image) at mid-rapidity in Au + Au collision at image.We investigate number-of-constituent quark (NCQ) scaling of identified hadrons image for different collision centralities. Maximum deviation from ideal NCQ scaling is observed at the level of 10% for centrality 30–80% at image. This may indicate smaller contribution to the collectivity from the partonic phase in the peripheral collisions. We also observe that the mass ordering of image break down between proton and ϕ-meson for image. This could be due to the effect of later stage hadronic interactions on image.