2004/12/31 by Daekyoung Kang, Jong-Wan Lee, Jungil Lee +2 · 10 citations
Physics and Astronomy · #Annihilation #Computer science #Evaporation #High-Energy Particle Collisions Research #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quarkonium #Section (typography) #Thermodynamics #hep-ph
paper · pdf · doi:10.1103/physrevd.71.094019
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 71(9) (American Physical Society) · 8 pages, 3 figures, text improved, version published in Physical Review D
arxiv created 2005/05/18 · openalex publication_date 2005/05/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Measurements by Belle Collaboration of the cross section for inclusive J/\ensuremathψ production in e+e^\ensuremath- annihilation have been a serious challenge to current heavy-quarkonium theory. In particular, the measured cross sections for exclusive J/\ensuremathψ+\ensuremathηc and inclusive J/\ensuremathψ+cc+X differ from nonrelativistic QCD predictions by an order of magnitude. In order to check if other available alternative theories can resolve such a large discrepancy, we calculate the cross section for inclusive J/\ensuremathψ+cc+X based on the color-evaporation model. As a phenomenological model, the color-evaporation model is still employed to predict cross sections for inclusive quarkonium production in various processes. Our results show that the color-evaporation-model prediction is even smaller than the nonrelativistic QCD prediction by an order of magnitude. The resultant color-evaporation-model prediction for the J/\ensuremathψ+cc+X fraction in the inclusive J/\ensuremathψ production cross section is 0.049, while the empirical value measured by Belle Collaboration is 0.82.