Charmonium Production at High pt at RHIC

We calculate transverse-momentum (pt) spectra and elliptic flow of J/ψ’s in Au-Au and Cu-Cu collisions at RHIC. We employ an earlier constructed 2-component approach for direct and regenerated charmonia which is fairly consistent with the centrality dependence of inclusive J/ψ yields at SPS and RHIC. Discrepancies with high-pt data in Cu-Cu collisions are addressed by implementing effects of a finite formation time and an estimate of B meson feeddown, which largely resolve the problem. The sensitivity of the spectra to the Cronin effect and different in-medium dissociation rates is studied. The predicted elliptic flow in semicentral Au-Au collisions is rather small, ∼2-3%.