This article presents measurements of inclusive J/ψ production at midrapidity (|y| < 1. 0) in Au+Au collisions at sNN = 54. 4 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A suppression of the J/ψ yield, quantified using the nuclear modification factors (R₀₀, R₂), is observed with respect to the scaled production in p+p collisions. The dependence of R₀₀ on collision centrality and J/ψ transverse momentum is measured with improved precision compared to previous measurements at 39 and 62. 4 GeV, while the centrality dependence of R₂ is measured and compared to the same results at 39, 62. 4, and 200 GeV. In central collisions, no significant collision energy dependence of R₀₀ is found within uncertainties for collision energies between 17. 3 and 200 GeV. Two transport model calculations that include dissociation and regeneration contributions are consistent with the experimental results within uncertainties. Although no significant collision energy dependence of the J/ψ suppression in high energy heavy-ion collisions up to sNN = 200 GeV is observed within uncertainties, the newly measured results at 54. 4 GeV Au+Au collisions provide additional constraints on theoretical calculations of the hot medium evolution and cold nuclear matter effects.
the STAR Collaboration (Thu,) studied this question.