The gluon-gluon fusion process gg -> J/psi + c cbar is computed at NLO QCD, with large corrections, nearly unpolarized J/psi, and improved agreement with LHC data, while a normalization gap of about an order of magnitude persists.
NLO corrections to $J/\psi+c+\bar{c}$ photoproduction
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abstract
Based on the factorization framework of nonrelativistic quantum chromodynamics, we study the associated $J/\psi+c+\bar{c}$ photoproduction process at next-to-leading order in $\alpha_s$ and leading order in the velocity expansion. The total cross section and differential cross section in $p_T^2$, $W$ and $z$ are presented. The results indicate that the next-to-leading order corrections are substantial, and testable in experiment.
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$J/\psi$ Polarization and $p_T$ distribution in $c\ \!\bar{c}$ associated hadroproduction at $\mathcal{O}(\alpha_s^5)$
The gluon-gluon fusion process gg -> J/psi + c cbar is computed at NLO QCD, with large corrections, nearly unpolarized J/psi, and improved agreement with LHC data, while a normalization gap of about an order of magnitude persists.