Peng Sun, C. -P. Yuan, Feng Yuan
We extend the non-relativistic QCD (NRQCD) prediction for the production of heavy quarkonium with low transverse momentum in hadronic collisions by taking into account effects from all order soft gluon resummation. Following the Collins-Soper-Sterman formalism, we resum the most singular terms in the partonic subprocesses. The theoretical predictions of J/psi and Upsilon productions are compared to the experimental data from the fixed target experiments (E866) and the collider experiments (RHIC, Tevatron, LHC). The associated non-perturbative Sudakov form factor for the gluon distributions is found to be different from the previous assumption of rescaling the quark form factor by the ratio of color factors. We further comment on the implication of our results on determining the color-octet matrix elements associated with the J/psi and Upsilon productions in the NRQCD factorization formalism.
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http://arxiv.org/abs/1210.3432
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