Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-14
Phys.Lett.B664:253-257,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 6 figures; NA50 2000 data corrected in Fig.3 in v2; Implementation of leakage effect is corrected in v3, Numerical re
Scientific paper
10.1016/j.physletb.2008.03.068
We investigate J/\psi transverse-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/\psi, \chi_c and \psi' 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.
Rapp Ralf
Zhao Xingbo
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