Color-Octet Quarkonium Production at theZPole

Abstract
The direct production rate of J/ψ via the color-octet mechanism is calculated at the Z resonance. The color-octet production process ZJ/ψqq¯ is shown to have a substantial branching ratio as well as a distinctive energy spectrum, which can be used as a powerful tool to distinguish from the color-singlet direct production of the J/ψ.