A model for the production of double quarkonium in PbPb collisions at √s_NN= 5.02 TeV

We model the uncorrelated production of double quarkonium (γ and J/ψ mesons) in Pb+Pb collisions at √s_NN = 5.02 TeV through implementation of a standard Monte Carlo Glauber model and a Monte Carlo particle production simulation, PYTHIA 8.306. A multinomial model, using probabilities obtained from relevant literature as well as from a PYTHIA simulation, was used to obtain estimates of double quarkonium yields corresponding to an integrated luminosity of L = 1.7nb^-1 collected by CMS in the 2018 PbPb run. Distributions from PYTHIA for the γ and J/ψ mesons and their daughter muons were used to calculate acceptance, and muon efficiencies were obtained from studies done in CMS. Estimates of the probability of production for the γ and J/ψ mesons were made from these values. The estimates of double quarkonium production can be used for comparison to future measurements to be performed at the CMS detector.