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- W2174659267 abstract "To clarify the conflict between the theoretical predictions and experimental measurements of the inclusive $J/ensuremath{psi}$ production in $ensuremath{Upsilon}$ decay, we consider the ${ensuremath{alpha}}_{s}^{6}$ order color-singlet (CS) contributions of processes $ensuremath{Upsilon}ensuremath{rightarrow}J/ensuremath{psi}+gg$ and $ensuremath{Upsilon}ensuremath{rightarrow}J/ensuremath{psi}+gggg$. Both the branching ratio and the $J/ensuremath{psi}$ momentum spectrum are calculated, and the branching ratio ($4.7ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$) is larger than the leading-order contribution (${ensuremath{alpha}}_{s}^{5}$, $ensuremath{Upsilon}ensuremath{rightarrow}J/ensuremath{psi}+coverline{c}g$). Together with the QCD and QED leading-order contributions considered in our previous work, the CS prediction of the branching ratio for the direct $J/ensuremath{psi}$ production is $mathrm{Br}(ensuremath{Upsilon}ensuremath{rightarrow}J/{ensuremath{psi}}_{mathrm{direct}}+X)={0.90}_{ensuremath{-}0.31}^{+0.49}ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$, which is still about 3.8 times less than the CLEO measurement. We also obtain a preliminary CS prediction of ${R}_{cc}=frac{mathcal{B}(ensuremath{Upsilon}ensuremath{rightarrow}J/ensuremath{psi}+coverline{c}+X)}{mathcal{B}(ensuremath{Upsilon}ensuremath{rightarrow}J/ensuremath{psi}+X)}$ and find that the value ${0.39}_{ensuremath{-}0.20}^{+0.21}$ is much larger than the color-octet prediction, and suggest to measure this quality in future experimental analysis." @default.
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- W2174659267 date "2010-11-30" @default.
- W2174659267 modified "2023-09-25" @default.
- W2174659267 title "Color-singletJ/ψproduction atO(αs6)inΥdecay" @default.
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- W2174659267 doi "https://doi.org/10.1103/physrevd.82.094033" @default.
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