Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-26
Phys.Rev. D71 (2005) 094019
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 3 figures, text improved, version published in Physical Review D
Scientific paper
10.1103/PhysRevD.71.094019
Measurements by the Belle Collaboration of the cross section for inclusive J/psi production in e^+e^- annihilation have been a serious challenge to current heavy-quarkonium theory. Especially, the measured cross sections for exclusive J/psi+eta_c and inclusive J/psi+cc-bar+X differ from nonrelativistic QCD predictions by an order of magnitude. In order to check if other available alternative theory can resolve such a large discrepancy, we calculate the cross section for inclusive J/psi+cc-bar+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 J/psi+cc-bar+X fraction in the inclusive J/psi production cross section is 0.049, while the empirical value measured by the Belle Collaboration is 0.82.
Kang Daekyoung
Kim Taewon
Ko Pyungwon
Lee Jong-Wan
Lee Jungil
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