J/psi Transverse Momentum Distribution in High Energy Nuclear Collisions

Details J/psi Transverse Momentum Distribution in High Energy Nuclear Collisions J/psi Transverse Momentum Distribution in High Energy Nuclear Collisions

2009-01-19

arxiv.org/abs/0901.2757v2

Physics Letters B 678 (2009), pp. 72-76

Physics

Nuclear Physics

Nuclear Theory

7 pages, 3 figures, final version, accepted by Phys. Lett. B

Scientific paper

10.1016/j.physletb.2009.06.006

The transverse momentum (pt) dependence of J/psi production in heavy ion collisions is investigated in a transport model with both initial production and continuous regeneration of charmonia. The competition between the two production mechanisms results in a pt suppression in central collisions, the gluon multi-scattering in the initial stage leads to a high pt enhancement, and the regeneration populates J/psis at low pt region and induces a minimum in R_AA(pt). These three phenomena are indeed observed in both 200 GeV Cu+Cu and Au+Au collisions at RHIC energy.

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