Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-08-12
Phys.Lett. B444 (1998) 237-244
Physics
Nuclear Physics
Nuclear Theory
10 pages, 3 figures
Scientific paper
10.1016/S0370-2693(98)01390-2
Charmonium production from the hadron gas formed in ultra-relativistic heavy-ion collisions is studied. Using the $J/\psi$-hadron absorption cross section determined from the nonperturbative quark-exchange model, which has a peak value similar to that used in the comover model for $J/\psi$ suppression and a thermally averaged value consistent from that extracted from $J/\psi$ data in heavy-ion collisions, we find that $J/\psi$ production from the hadron gas is negligible in heavy-ion collisions at RHIC energies but is important at LHC energies as a result of the large number of charm mesons produced at higher energy collisions. The number of $J/\psi$ produced from these secondary collisions at LHC may be comparable to that of primary $J/\psi$'s, which are expected to be dissociated in the quark-gluon plasma created in the collisions, leading thus to a possible absence of $J/\psi$ suppression. Similar results are obtained for $\psi^\prime$ production in ultra-relativistic heavy-ion collisions.
Ko Che Ming
Wang Xin-Nian
Zhang Xiao-Fei
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