Speaker
Description
Heavy quarkonium production of high transverse momentum ($p_T$) in hadronic collisions can be pursued in the QCD factorization formalism with heavy quarkonium fragmentation functions (FFs), which carry rich information on how a physically observed quarkonium was emerged from quarks and gluons produced in high energy scattering. The scale evolution of quarkonium FFs enables us to resum logarithmically enhanced corrections to the production cross sections. In [arXiv:2108.00305], we demonstrated that the QCD factorization approach at leading-power in $1/p_T$ with single parton FFs describes LHC data on the differential cross-section for $J/\psi$ production in hadronic collisions at $p_T$ much larger than heavy quark mass scale. When $p_T$ decreases, the subleading power contribution with double parton FFs at twist-4 becomes more significant than the leading power contribution. In this talk, we will demonstrate how QCD factorization approach including both leading power and next-to-leading power contributions can describe the transverse momentum distribution of J/psi production at both Tevatron and the LHC, emphasizing the important role of the new subleading power contributions in hadronic quarkonium production and the matching to the low $p_T$ region.
| speaker affiliation | Jefferson Lab |
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