Next-to-leading order QCD and relativistic corrections to $Z \to J/ψ+Υ(nS)$
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913051150647296 |
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| author | Wang, Guang-Yu Zheng, Xu-Chang Xu, Guang-Zhi |
| author_facet | Wang, Guang-Yu Zheng, Xu-Chang Xu, Guang-Zhi |
| contents | In this paper, we calculate the decay widths and branching fractions for the decays $Z \to J/ψ+Υ(nS)$ ($n=1,2,3$) 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. Therefore, it is essential to take these corrections into account for a reliable estimation. For a high-luminosity electron positron collider running around the $Z$-pole, sizable event rates could be produced from these rare decay channels due to the $Z$-boson resonance effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_19439 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Next-to-leading order QCD and relativistic corrections to $Z \to J/ψ+Υ(nS)$ Wang, Guang-Yu Zheng, Xu-Chang Xu, Guang-Zhi High Energy Physics - Phenomenology In this paper, we calculate the decay widths and branching fractions for the decays $Z \to J/ψ+Υ(nS)$ ($n=1,2,3$) 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. Therefore, it is essential to take these corrections into account for a reliable estimation. For a high-luminosity electron positron collider running around the $Z$-pole, sizable event rates could be produced from these rare decay channels due to the $Z$-boson resonance effect. |
| title | Next-to-leading order QCD and relativistic corrections to $Z \to J/ψ+Υ(nS)$ |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.19439 |