We present high precision measurements of elliptic flow near midrapidity
(∣y∣<1.0) for multi-strange hadrons and ϕ meson as a function of
centrality and transverse momentum in Au+Au collisions at center of mass energy
sNN= 200 GeV. We observe that the transverse momentum dependence of
ϕ and Ωv2 is similar to that of π and p, respectively,
which may indicate that the heavier strange quark flows as strongly as the
lighter up and down quarks. This observation constitutes a clear piece of
evidence for the development of partonic collectivity in heavy-ion collisions
at the top RHIC energy. Number of constituent quark scaling is found to hold
within statistical uncertainty for both 0-30% and 30-80% collision
centrality. There is an indication of the breakdown of previously observed mass
ordering between ϕ and proton v2 at low transverse momentum in the
0-30% centrality range, possibly indicating late hadronic interactions
affecting the proton v2.Comment: 7 pages and 4 figures, Accepted for publication in Physical Review
Letter