Next-to-leading order QCD and relativistic corrections to $Z \to J/\psi+\Upsilon(nS)$

Guang-Yu Wang; Xu-Chang Zheng; Guang-Zhi Xu

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arXiv · 2604.19439

Next-to-leading order QCD and relativistic corrections to $Z \to J/\psi+\Upsilon(nS)$

Guang-Yu Wang·Xu-Chang Zheng·Guang-Zhi Xu

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Abstract

In this paper, we calculate the decay widths and branching fractions for the decays $Z \to J/\psi+\Upsilon(nS)$ ($n=1,2,3$) at future super $Z$ factory and at the CEPC/FCC-ee, including both the relativistic and QCD corrections within the framework of nonrelativistic QCD. Both the relativistic and QCD corrections are found to be large and negative. Compared to the leading-order results, the decay widths are significantly reduced by the higher-order corrections due to significant numerical cancellations. Despite the resulting large theoretical uncertainties, sizable event rates from these rare decay channels could still be anticipated at future high-luminosity electron-positron colliders running around the Z-pole. Ultimately, our results provide an essential theoretical baseline, highlighting the necessity of incorporating even higher-order corrections and resummation techniques for future precision phenomenological studies.

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Guang-Yu Wang, Xu-Chang Zheng, Guang-Zhi Xu. 2026-04-21. Next-to-leading order QCD and relativistic corrections to $Z \to J/\psi+\Upsilon(nS)$. https://arxiv.org/abs/2604.19439

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