Transverse Momentum Spectra of J/ψin Heavy-Ion Collisions

Abstract

We investigate J/ψtransverse-momentum (p_t) distributions and their centrality dependence in heavy-ion collisions at SPS and RHIC within the framework of a two-component model, which includes (i) primordial production coupled with various phases of dissociation, (ii) statistical coalescence of c and \bar{c} quarks at the hadronization transition. The suppression of the direct component (i) is calculated by solving a transport equation for J/ψ, χ_c and ψ' in an expanding fireball using momentum dependent dissociation rates in the Quark-Gluon Plasma (QGP). The coalescence component is inferred from a kinetic rate equation with a momentum dependence following from a blast wave approach. At SPS energies, where the direct component dominates, the interplay of Cronin effect and QGP suppression results in fair agreement with NA50 p_t spectra. At RHIC energies, the p_t spectra in central Au+Au collisions are characterized by a transition from regeneration at low p_t to direct production above. At lower centralities, the latter dominates at all p_t.

7 pages, 6 figures; NA50 2000 data corrected in Fig.3 in v2; Implementation of leakage effect is corrected in v3, Numerical results for Cronin effect at RHIC are corrected in v3

References in corpus (8)

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• J/psi Production vs Centrality, Transverse Momentum, and Rapidity in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Statistical hadronization of heavy quarks in ultra-relativistic nucleus-nucleus collisions
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• Comprehensive Interpretation of Thermal Dileptons at the SPS
• Charmonium dynamics in nucleus-nucleus collisions at SPS and FAIR energies

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