Studies of $Z$ boson decay into double $Υ$ mesons at the NLO QCD accuracy
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909295634808832 |
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| author | Li, Cong Jiang, Ying-Zhao Sun, Zhan |
| author_facet | Li, Cong Jiang, Ying-Zhao Sun, Zhan |
| contents | In this paper, we employ the nonrelativistic QCD factorization to conduct a comprehensive examination of the $Z$ boson decay into a pair of $Υ$ mesons, achieving accuracy at the next-to-leading-order (NLO) in $α_s$. Our calculations demonstrate that the QED diagrams are indispensable in comparison to the pure QCD diagrams, and the implementation of QCD corrections markedly enhance the QCD results, whereas it substantially diminish the QED results. To ensure consistency with the experimental methodology, we have taken into account the feed-down transitions originating from higher excited states, which exhibit significant relevance. Combining all the contributions, we arrive at the NLO prediction of $\mathcal{B}_{Z \to Υ(nS)+Υ(mS)} \sim 10^{-11}$, which is notably lower than the upper limits set by CMS. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_19418 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Studies of $Z$ boson decay into double $Υ$ mesons at the NLO QCD accuracy Li, Cong Jiang, Ying-Zhao Sun, Zhan High Energy Physics - Phenomenology In this paper, we employ the nonrelativistic QCD factorization to conduct a comprehensive examination of the $Z$ boson decay into a pair of $Υ$ mesons, achieving accuracy at the next-to-leading-order (NLO) in $α_s$. Our calculations demonstrate that the QED diagrams are indispensable in comparison to the pure QCD diagrams, and the implementation of QCD corrections markedly enhance the QCD results, whereas it substantially diminish the QED results. To ensure consistency with the experimental methodology, we have taken into account the feed-down transitions originating from higher excited states, which exhibit significant relevance. Combining all the contributions, we arrive at the NLO prediction of $\mathcal{B}_{Z \to Υ(nS)+Υ(mS)} \sim 10^{-11}$, which is notably lower than the upper limits set by CMS. |
| title | Studies of $Z$ boson decay into double $Υ$ mesons at the NLO QCD accuracy |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2407.19418 |