Abstract
In this article, we study in detail the double-J/ψ yield through Z decay at the next-to-leading-order (NLO) QCD accuracy within the nonrelativistic QCD factorization. At the tree level, the pure QCD diagrams predict a branching ratio of \( {\mathcal{B}}_{Z\to J/\psi +J/\psi } \) ~ 10−12; however, the inclusion of the QED diagrams would augment this prediction by approximately 2–3 orders of magnitude. After incorporating the QCD corrections, the QCD results exhibit a considerable increase, whereas the QED results undergo a substantial reduction. Combining the QCD and QED contributions at NLO in αs, it is observed that the prediction of \( {\mathcal{B}}_{Z\to J/\psi +J/\psi } \) = (\( {1.110}_{-0.241-0.001}^{+0.334+0.054} \)) × 10−10, which displays a fairly steady dependence on the renormalization scale, is significantly lower than the upper limits released by CMS.
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This work is supported by the Natural Science Foundation of China under the Grant No. 12065006.
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Li, C., Sun, Z. & Zhang, GY. Analysis of double-J/ψ production in Z decay at next-to-leading-order QCD accuracy. J. High Energ. Phys. 2023, 120 (2023). https://doi.org/10.1007/JHEP10(2023)120
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DOI: https://doi.org/10.1007/JHEP10(2023)120