Title: Bottomonium Production at RHIC and the LHC
Abstract: We investigate the production of ground and excited states of bottomonia in high energy heavy-ion collisions within a rate equation approach. The bottomonium transport parameters include several recent improvements: in-medium binding energies based on microscopic T-matrix calculations with pertinent dissociation rates, effects of B-meson resonance formation near hadronization in the bottom chemistry, and realistic (non-thermalized) b-quark spectra to model the transverse momentum spectra of regenerated bottomonia. The bulk medium evolution is based on a parametrization of the equation of state computed in lattice QCD, using an expanding fireball with a collective flow guided by hydrodynamic simulations. We calculate the centrality and transverse-momentum dependent nuclear modification factor R_AA of Y(1S) and Y(2S) , and compare the results to experimental data at RHIC and the LHC. We also provide predictions for the elliptic flow v2 and discuss its sensitivity to different production and suppression mechanisms. The sensitivity of observables to various modelling components is studies in order to quantify the significance of in-medium binding energy of bottomonia. We argue that the Y(1S) suppression is a promising observable for quantifying the color screening effect on the in-medium QCD force.
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