Inclusive J/ψProduction In ΥDecay Via Color-singlet Mechanism

Abstract

We reconsider the tree level color-singlet contribution for the inclusive J/ψproduction in Υdecay with the α_{s}^{5} order QCD process Υ\to J/ψ+c\bar{c}+g and α^{2}α_s^{2} order QED processes Υ\toγ^{\ast}\to J/ψ+c\bar{c} and Υ\to J/ψ+gg. It is found that the contribution of the QED process is compatible with that of the QCD process, and the numerical results for the QCD process alone is an order of magnitude smaller than the previous theoretical predictions, and our theoretical prediction in total is about an order of magnitude smaller than the recent CLEO measurement on the branching fraction B(Υ\to J/ψ+X). It indicates that the J/ψproduction mechanism in Υdecay is not well understood, and further theoretical work and experimental analysis are still necessary.

16 pages, 3 figures

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• QCD corrections to J/psi and Upsilon production at hadron colliders
• Upsilon production at the Tevatron and the LHC
• QCD corrections to J/psi polarization of hadronproduction at Tevatron and LHC
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Cited by in corpus (9)

• QCD corrections to Upsilon production via color-octet states at the Tevatron and LHC
• ${\chi }_{cJ}$ production associated with a $c\bar{c}$ pair at hadron colliders
• The next-to-leading-order QCD correction to inclusive J/ψ(Υ) production in Z^0 decay
• Breakdown of NRQCD Factorization in Processes Involving Two Quarkonia and its Cure
• Color-singlet J/psi production at alpha_s^6 in Upsilon decay
• Photoproduction of $J/\psi$ with forward hadron tagging in hadronic collisions
• Inclusive $J/\psi$ and ${\eta }_c$ production in ${\rm Y}$ decay at $\mathcal{O}({\alpha }_s^5)$ in nonrelativistic QCD factorization
• Inclusive ${\chi }_{cJ}$ production in ${\rm Y}$ decay at $\mathcal{O}({\alpha }_s^5)$ in NRQCD factorization
• The QED contribution to $J/\psi$ plus light hadrons production at B-factories