Triple $Z'$ signatures at $Z$ factories
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913602566356992 |
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| author | Nomura, Takaaki Yagyu, Kei |
| author_facet | Nomura, Takaaki Yagyu, Kei |
| contents | We discuss triple $Z'$ boson signatures via the decay chain of $Z \to Z' ϕ\to Z' Z' Z'$, with a new light scalar $ϕ$, at future Z factories such as CEPC and FCC-ee. These new bosons $ϕ$ and $Z'$ naturally appear in models with a new $U(1)$ gauge symmetry which is spontaneously broken and introduced in various new physics scenarios. The branching ratio of $Z \to Z' ϕ\to Z' Z' Z'$ can be larger than $10^{-12}$, which gives $O(1)$ events at Tera-Z experiments, when a product of $g_X^{}$ (new gauge coupling) and $ζ$ ($Z$-$Z'$ mixing) is larger than around $10^{-6}$. We find that the search for $Z \to Z'Z'Z'$ can significantly improve the current bound on a kinetic mixing parameter $ε$ in the dark photon case, where $ε\gtrsim 10^{-6}$ with $g_X^{}={\cal O}(1)$ can be explored at Tera-Z experiments. We also show that a sufficiently large number of events with multi-lepton plus hadronic jets can be obtained in benchmark points, which cannot be realized by the usual decay of Z in the standard model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_06302 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Triple $Z'$ signatures at $Z$ factories Nomura, Takaaki Yagyu, Kei High Energy Physics - Phenomenology High Energy Physics - Experiment We discuss triple $Z'$ boson signatures via the decay chain of $Z \to Z' ϕ\to Z' Z' Z'$, with a new light scalar $ϕ$, at future Z factories such as CEPC and FCC-ee. These new bosons $ϕ$ and $Z'$ naturally appear in models with a new $U(1)$ gauge symmetry which is spontaneously broken and introduced in various new physics scenarios. The branching ratio of $Z \to Z' ϕ\to Z' Z' Z'$ can be larger than $10^{-12}$, which gives $O(1)$ events at Tera-Z experiments, when a product of $g_X^{}$ (new gauge coupling) and $ζ$ ($Z$-$Z'$ mixing) is larger than around $10^{-6}$. We find that the search for $Z \to Z'Z'Z'$ can significantly improve the current bound on a kinetic mixing parameter $ε$ in the dark photon case, where $ε\gtrsim 10^{-6}$ with $g_X^{}={\cal O}(1)$ can be explored at Tera-Z experiments. We also show that a sufficiently large number of events with multi-lepton plus hadronic jets can be obtained in benchmark points, which cannot be realized by the usual decay of Z in the standard model. |
| title | Triple $Z'$ signatures at $Z$ factories |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.06302 |