Color-singlet direct J/ψ and ψ' production at Tevatron in the k_t factorization approach release_y7ennsugzfa3regxhtoc2qlfgq

by F. Yuan, K.T. Chao

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Direct J/ψ and ψ' production rates at Tevatron are calculated in the k_t-factorization approach within the color-singlet model. In this approach, the production rates are enhanced by a factor of 20 compared to the naive collinear parton model. However, the theoretical predictions are still below the experimental data by at least one order of magnitude. This means that to explain charmonium productions at Tevatron, we still need to call for the contributions from color-octet channels or other production mechanisms.
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