Color-singlet J/psi production at alpha_s^6 in Upsilon decay

Abstract

To clarify the conflict between the theoretical predictions and experimental measurements of the inclusive J/psi production in Upsilon decay, We consider the alpha_s^6 order color-singlet contributions of processes Upsilon --> J/psi+gg and Upsilon --> J/psi+gggg. Both the branching ratio and J/psi momentum spectrum are calculated, and the branching ratio 4.7 x 10^{-4} is larger than the leading-order contribution (alpha_s^5, Upsilon --> J/psi+c\bar{c}g). Together with the QCD and QED leading-order contributions considered in our previous work, the color-singlet prediction of the branching ratio for the direct J/psi production is Br(Upsilon--> J/psi_{direct}+X)=0.90^{+0.49}_{-0.31} x 10^{-4}, which is still about 3.8 times less than the CLEO measurement. We also obtain a preliminary color-singlet prediction of R_{cc}=sigma(Upsilon --> J/psi+c\bar{c}+X)/ sigma(Upsilon --> J/psi+X) and find the value 0.39^{+0.21}_{-0.20} is much larger than the color-octet predictions, and suggest to measure this quality in future experimental analysis.

arXiv comment6 pages, 5 figures

References in corpus (31)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Color-Octet Fragmentation and the psi' Surplus at the Tevatron
• Observation of Double cc bar Production in e+ e- Annihilation at sqrt{s} ~ 10.6 GeV
• QCD corrections to J/psi and Upsilon production at hadron colliders
• Next-to-Leading Order QCD Correction to ${\mathbf{e}}^{+}{\mathbf{e}}^{-}\to \mathbf{J}/\mathbf{\psi }+{\mathbf{\eta }}_{\mathbf{c}}$ at $\sqrt{s}=10.6$GeV}
• QCD corrections to J/psi polarization of hadronproduction at Tevatron and LHC
• Hadroproduction of J/psi and Upsilon in association with a heavy-quark pair
• Progress in FDC Project
• QCD corrections to J/psi production via color octet states at Tevatron and LHC
• Relativistic corrections to $J/\psi$ exclusive and inclusive double charm production at B factories
• QCD radiative correction to color-octet $J/\psi$ inclusive production at B Factories
• Complete next-to-leading-order corrections to J/psi photoproduction in nonrelativistic quantum chromodynamics
• QCD corrections to ${\mathbf{e}}^{+}{\mathbf{e}}^{-}\to \mathbf{J}/\mathbf{\psi gg}$ at B Factories
• Next-to-Leading-Order QCD Corrections to e^ + e^- -> J/ψ+gg at the B Factories
• QCD corrections to polarization of J/ψand Υat Fermilab Tevatron and CERN LHC
• Measurement of the e+e- -> J/psi ccbar cross section at \sqrt{s} ~10.6 GeV
• J/psi production at HERA
• Next-to-Leading-Order QCD Corrections to e+ e- --> J/psi c c_bar at the B Factories
• Relativistic correction to $e^{+}{e}^{-}\to J/\psi +gg$ at $B$ factories and constraint on color-octet matrix elements
• J/ψpolarization in photo-production up-to the next-to-leading order of QCD
• Color-Octet $J/\psi$ Production in the ${\rm Y}$ Decay
• Color-singlet relativistic correction to inclusive $J/\psi$ production associated with light hadrons at $B$ factories
• New Measurements of Upsilon(1S) Decays to Charmonium Final States
• ${\rm Y}$ decay into charmonium and the color octet mechanism
• The next-to-leading-order QCD correction to inclusive J/ψ(Υ) production in Z^0 decay
• Inclusive J/psi production in Upsilon decay via color-octet mechanisms
• Contribution of Colour-singlet Process ${\rm Y}\to J/\Psi +c\bar{c}g$ to ${\rm Y}\to J/\Psi +X$
• QED contribution to the production of J/ψ+c\bar{c}+X at the Tevatron and LHC
• Inclusive J/ψProduction In ΥDecay Via Color-singlet Mechanism
• Remarks on CLEO New Measurements for Upsilon(1S) Decays to Charmonium Final States and Investigations on Associate Strange Particle Enhancement in Upsilon to J/Psi +X
• Color-Octet $\jpsi$ Production in ${\rm Y}$ Decay near the Kinematic Limit

Cited by in corpus (5)

• Breakdown of NRQCD Factorization in Processes Involving Two Quarkonia and its Cure
• 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