Contribution of colour-singlet process ϒ→J/Ψ+cc̄g to ϒ→J/Ψ+X

We show that the colour-singlet process ϒ→J/Ψ+cc̄g significantly contributes to the inclusive process ϒ→J/Ψ+X. We calculate the partial width and the momentum distribution of the produced J/Ψ in this channel. The obtained width is comparable to the experimental data. The momentum distribution is fairly soft, which is in contrast to the results from the colour-octet processes discussed earlier in literature but is consistent with the CLEO measurements. Further experiments to check this contribution are suggested.