QCD factorization for hadronic quarkonium production at high pT
Kyle Lee, Jian-Wei Qiu, George Sterman, Kazuhiro Watanabe
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Heavy quarkonium production at high transverse momentum (pT) in hadronic collisions is explored in the QCD factorization approach. We find that the leading power in the 1/pT expansion is responsible for high pT regime, while the next-to-leading power contribution is necessary for the low pT region. We present the first numerical analysis of the scale evolution of coupled twist-2 and twist-4 fragmentation functions (FFs) for heavy quarkonium production and demonstrate that the QCD factorization approach is capable of describing the pT spectrum of hadronic J/ψ production at the LHC.
Authors' comments: 7 pages, 3 figures. Contribution to the XXVIII International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2021). SciPost Proceedings
