QCD Corrections to e+e-→J/ψ+gg at B Factories

In heavy quarkonium production, the measured ratio Rcc=σ[J/ψ+cc+X]/σ[J/ψ+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/ψ+gg can enhance the cross section by about 20%. Together with the calculated NLO result for e+e-→J/ψ+cc, we show that the NLO corrections can significantly improve the fit to the ratio Rcc. The effects of leading logarithm resummation near the end point on the J/ψ momentum distribution and total cross section are also considered. Comparison of the calculated cross section for e+e-→J/ψ+gg with the observed cross section for e+e-→J/ψ+non-(cc) is expected to provide unique information on the issue of color-octet contributions.