J/ψ transverse momentum distribution in high energy nuclear collisions

• DOI: 10.1016/j.physletb.2009.06.006
• Publication Date: 2009-06-09T08:42:27Z
• Authors: Yunpeng Liu; Zhen Qu; Nu Xu; Pengfei Zhuang
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

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.<br/>7 pages, 3 figures, final version, accepted by Phys. Lett. B<br/>