Color Screening and Regeneration of Bottomonia in High-Energy Heavy-Ion Collisions

Abstract

The production of ground-state and excited bottomonia in ultrarelativistic heavy-ion collisions is investigated within a kinetic-rate equation approach including regeneration. We augment our previous calculations by an improved treatment of medium effects, with temperature-dependent binding energies and pertinent reaction rates, $B$-meson resonance states in the equilibrium limit near the hadronization temperature, and a lattice-QCD based equation of state for the bulk medium. In addition to the centrality dependence of the bottomonium yields we compute their transverse-momentum ($p_T$) spectra and elliptic flow with momentum-dependent reaction rates and a regeneration component based on $b$-quark spectra from a nonperturbative transport model of heavy-quark diffusion. The latter has noticeable consequences for the shape of the bottomonium $p_T$ spectra. We quantify how uncertainties in the various modeling components affect the predictions for observables. Based on this we argue that the ${\rm Y}(1S)$ suppression is a promising observable for mapping out the in-medium properties of the QCD force, while ${\rm Y}(2S)$ production can help to quantify the role of regeneration from partially thermalized $b$ quarks.

arXiv comment26 pages, 52 figures

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