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QCD analysis of near-threshold photon-proton production of heavy quarkonium

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Guo, Yuxun ; Ji, Xiangdong ; Liu, Yizhuang
License: Creative Commons Attribution 4.0
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Date of publication of this fulltext: 20 Feb 2022 15:37


The near-threshold photo or electroproduction of heavy vector quarkonium off the proton is studied in quantum chromodynamics. Similar to the high-energy limit, the production amplitude can be factorized in terms of gluonic generalized parton distributions and the quarkonium distribution amplitude. At the threshold, the threshold kinematics has a large skewness parameter xi, leading to the ...


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