Onset of J/ψ melting in quark-gluon fluid at RHIC

We have developed a hydro+J/psi model to study the sequential suppression of charmonia at RHIC energy. The (3+1)-dimensional relativistic ideal hydrodynamics is employed to describe the spacetime evolution of hot and dense matter, and charmonia are treated as impurity traversing through the matter. The observed J/psi suppression at mid-rapidity in Au+Au collisions at RHIC is reproduced well by the sequential melting of chi(c), psi' and J/psi in the medium. The melting temperature of directly produced J/psi is well determined to be similar to 2T(c). Azimuthal anisotropy of J/psi (v(2)) is calculated with this model. Survival probability and azimuthal anisotropy in the 'hot-wind scenario' are also presented.