Color-octetJψproduction in theϒdecay

The direct production rate of $\psi$ in the $\Upsilon$ decay is shown to be dominated by the process $\Upsilon \to \mathrm{gg}{g}^{*}$ followed by $g^{*}\to \psi$ via the color-octet mechanism proposed recently to explain the anomalous prompt charmonium production at the Fermilab Tevatron. We show that this plausibly dominant process has a branching ratio compatible with the experimental data. Further experimental study in this channel is important to test the significance of the color-octet component of the $c\overline{c}$ pair inside the $\psi$ system.