Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-23
Phys.Rev. C68 (2003) 041902
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, RevTeX4, 1 PS-figure. V2: The final PHENIX data are analyzed
Scientific paper
10.1103/PhysRevC.68.041902
The J/psi yield at midrapidity at the top RHIC (relativistic heavy ion collider) energy is calculated within the statistical coalescence model, which assumes charmonium formation at the late stage of the reaction from the charm quarks and antiquarks created earlier in hard parton collisions. The results are compared to the new PHENIX data and to predictions of the standard models, which assume formation of charmonia exclusively at the initial stage of the reaction and their subsequent suppression. Two versions of the suppression scenario are considered. One of them assumes gradual charmonium suppression by comovers, while the other one supposes that the suppression sets in abruptly due to quark-gluon plasma formation. Surprisingly, both versions give very similar results. In contrast, the statistical coalescence model predicts a few times larger $J/\psi$ yield in the most central collisions.
Gorenstein Mark I.
Greiner Walter
Kostyuk A. P.
Stoecker Horst
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