Comprehensive Description of J/ψ Production in Proton-Proton Collisions at Collider Energies

We employ a small x color glass condensate (CGC)+ nonrelativistic QCD (NRQCD) formalism to compute J/psi production at low p(perpendicular to) in proton-proton collisions at collider energies. Very good agreement is obtained for total cross sections, rapidity distributions, and low momentum p(perpendicular to) distributions. Similar agreement is obtained for psi' production. We observe an overlap region in p(perpendicular to) where our results match smoothly to those obtained in a next-to-leading order collinearly factorized NRQCD formalism. The relative contribution of color singlet and color octet contributions can be quantified in the CGC + NRQCD framework, with the former contributing approximately 10% of the total cross section.