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We present high precision measurements of elliptic flow near midrapidity($|y|<1.0$) for multi-strange hadrons and $\phi$ meson as a function ofcentrality and transverse momentum in Au+Au collisions at center of mass energy$\sqrt{s_{NN}}=$ 200 GeV. We observe that the transverse momentum dependence of$\phi$ and $\Omega$ $v_{2}$ is similar to that of $\pi$ and $p$, respectively,which may indicate that the heavier strange quark flows as strongly as thelighter up and down quarks. This observation constitutes a clear piece ofevidence for the development of partonic collectivity in heavy-ion collisionsat the top RHIC energy. Number of constituent quark scaling is found to holdwithin statistical uncertainty for both 0-30$\%$ and 30-80$\%$ collisioncentrality. There is an indication of the breakdown of previously observed massordering between $\phi$ and proton $v_{2}$ at low transverse momentum in the0-30$\%$ centrality range, possibly indicating late hadronic interactionsaffecting the proton $v_{2}$.

physical review letters

Centrality and transverse momentum dependence of elliptic flow of  multi-strange hadrons and $\phi$ meson in Au+Au collisions at $\sqrt{s_{NN}}$  = 200 GeV