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.
Testing the QCD fragmentation mechanism on heavy quarkonium production at LHC
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abstract
We calculate the fragmentation function for charm quark into J/psi at the QCD next-to-leading-order (NLO) and find that the produced J/psi is of larger momentum fraction than it is at the leading-order. Based on the fragmentation function and partonic processes calculated at the NLO, the transverse momentum distribution on J/psi hadroproduction associated with a charm c (or \bar{c}) jet are predicted. We find that the distribution is enhanced by a factor of 2.0--3.3 at the NLO as p_t increased from 10 GeV to 100 GeV and it is measurable at the LHC with charm tagger. The measurement at the LHC will supply a first chance to directly test the QCD fragmentation mechanism on heavy quarkonium production where the fragmentation function is calculable in perturbative QCD. It is also applied to J/psi (Upsilon) production in the decay of Z^0 (top quark).
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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.