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We calculate the transition between a quarkonium state and an unbound heavyquark-antiquark pair through gluo-dissociation and inelastic parton scatteringusing a partonic picture that interpolates between the formal limits based onpotential nonrelativistic QCD (pNRQCD) at different temperatures. While thethermal width increases with momentum and temperature, the quarkoniumregeneration is affected by the heavy quark distribution function which dependson the diffusion constant. By solving the Boltzmann equation with thedissociation and regeneration terms, we investigate the medium modifications ofquarkonium momentum spectra. Our numerical results indicate that the$\Upsilon(1S)$ $R_{AA}$ at high transverse momentum are influenced by theregeneration effects depending on the heavy quark diffusion. In this picture,the published CMS data that show an almost transverse momentum independence canbe explained by the interplay between the suppression by dissociation andenhancement by regeneration at low and high transverse momenta, respectively.With the same input, we also calculate the transverse momentum dependence ofthe $\Upsilon(1S)$ $v_2$ and show that it lies within the limits of theavailable data.

$\Upsilon(1S)$ transverse momentum spectra through dissociation and regeneration in heavy ion collisions