J/psi Transverse Momentum Distribution in High Energy Nuclear Collisions
Yunpeng Liu, Zhen Qu, Nu Xu, Pengfei Zhuang
TL;DR
This paper studies how J/psi particles' transverse momentum distribution in high energy nuclear collisions is affected by initial production, regeneration, and gluon scattering, revealing characteristic suppression and enhancement patterns at RHIC energies.
Contribution
It introduces a transport model that simultaneously considers initial production and regeneration of J/psi, capturing key phenomena observed in RHIC collisions.
Findings
Pt suppression in central collisions
High pt enhancement from gluon multi-scattering
Low pt regeneration leading to R_AA(pt) minimum
Abstract
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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