QCD corrections to ${\mathbf{e}}^{+}{\mathbf{e}}^{-}\to \mathbf{J}/\mathbf{\psi gg}$ at B Factories

Abstract

In heavy quarkonium production, the measured ratio $R_{c\bar{c}}=\sigma [J/\psi +c\bar{c}+X]/\sigma [J/\psi +X]$ at B factories is much larger than existing theoretical predictions. To clarify this discrepancy, in nonrelativistic QCD (NRQCD) we find the next-to-leading-order (NLO) QCD correction to $e^{+}{e}^{-}\to J/\psi +gg$ can enhance the cross section by about 20%. Together with the calculated NLO result for $e^{+}{e}^{-}\to J/\psi +c\bar{c}$, we show that the NLO corrections can significantly improve the fit to the ratio $R_{c\bar{c}}$. 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 $e^{+}{e}^{-}\to J/\psi +gg$ with observed cross section for $e^{+}{e}^{-}\to J/\psi +non(c\bar{c})$ is expected to provide unique information on the issue of color-octet contributions.

published version in PRL, 4 pages, 6 figures, references added, one figure changed

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• Upsilon production at the Tevatron and the LHC
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• Hadroproduction of J/psi and Upsilon in association with a heavy-quark pair
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• Next-to-Leading-Order QCD Corrections to e^ + e^- -> J/ψ+gg at the B Factories
• Factorization and NLO QCD correction in e^+ e^- \to J/ψ(ψ(2S))+ χ_{c0} at B Factories}
• QCD corrections to double J/ψproduction in e+e- annihilation at \sqrt{s}=10.6 GeV
• Color Transfer in Associated Heavy-Quarkonium Production
• Color Transfer Enhancement for Heavy Quarkonium Production
• The color-singlet contribution to e^+ e^- ->J/psi + X at the endpoint

Cited by in corpus (5)

• Next-to-Leading-Order QCD Corrections to e^ + e^- -> J/ψ+gg at the B Factories
• Real next-to-next-to-leading-order QCD corrections to J/psi and Upsilon hadroproduction in association with a photon
• Pair Production of Heavy Quarkonium and $B_c{(}^{\ast })$ Mesons at Hadron Colliders
• J/ψpolarization in photo-production up-to the next-to-leading order of QCD
• QED contribution to the production of J/ψ+c\bar{c}+X at the Tevatron and LHC