Flavor ordering of elliptic flows at high transverse momentum

Based on the quark coalescence model for the parton-to-hadron phase transition in relativistic heavy ion collisions, we relate the elliptic flow (v2) of high pT hadrons to that of high pT quarks. For high pT hadrons produced from an isospin-symmetric and quark-antiquark-symmetric partonic matter, magnitudes of their elliptic flows follow a flavor ordering as (v2,π=v2,N)>(v2,Λ=v2,Σ)>v2,K>v2,Ξ>(v2,φ=v2,Ω) if strange quarks have a smaller elliptic flow than light quarks. The elliptic flows of high pT hadrons further follow a simple quark counting rule if strange quarks and light quarks have the same high pT spectrum and coalescence probability.