title: QCD corrections to e+e- -->J/psi+gg at B factories.
abstract: In heavy quarkonium production, the measured ratio R_{cc[over ]}=sigma[J/psi+cc[over ]+X]/sigma[J/psi+X] at B factories is much larger than existing theoretical predictions. To clarify this discrepancy, in nonrelativistic QCD we find the next-to-leading-order (NLO) QCD correction to e;{+}e;{-}-->J/psi+gg can enhance the cross section by about 20%. Together with the calculated NLO result for e;{+}e;{-}-->J/psi+cc[over ], we show that the NLO corrections can significantly improve the fit to the ratio R_{cc[over ]}. The effects of leading logarithm resummation near the end point on the J/psi momentum distribution and total cross section are also considered. Comparison of the calculated cross section for e;{+}e;{-}-->J/psi+gg with the observed cross section for e;{+}e;{-}-->J/psi+non-(cc[over ]) is expected to provide unique information on the issue of color-octet contributions.
authors.affiliation: Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: Yan-Qing
authors.initials: YQ
authors.lastname: Ma
authors.forename: Yu-Jie
authors.initials: YJ
authors.lastname: Zhang
authors.forename: Kuang-Ta
authors.initials: KT
authors.lastname: Chao