title: Comprehensive description of J/ψ production in proton-proton collisions at collider energies.
abstract: We employ a small x color glass condensate (CGC)+ nonrelativistic QCD (NRQCD) formalism to compute J/ψ production at low p(⊥) in proton-proton collisions at collider energies. Very good agreement is obtained for total cross sections, rapidity distributions, and low momentum p(⊥) distributions. Similar agreement is obtained for ψ' production. We observe an overlap region in p(⊥) 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.
authors.affiliation: Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Ma
authors.affiliation: Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
authors.forename: Raju
authors.initials: R
authors.lastname: Venugopalan