Sensitivity to top-quark FCNC interactions at future muon colliders
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866918447686877184 |
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| author | Senol, A. Ozaltay, B. S. Tekin, M. Denizli, H. |
| author_facet | Senol, A. Ozaltay, B. S. Tekin, M. Denizli, H. |
| contents | We investigate flavor-changing neutral current (FCNC) interactions of the top quark at a future muon collider with a center-of-mass energy of $\sqrt{s} = 10~\mathrm{TeV}$. The process $μ^{+}μ^{-} \to ν_μ\,μ^+\,b\,j$ and its corresponding charge conjugate are considered as a probe of anomalous $tqZ$ and $tqγ$ couplings, parametrized within an effective field theory framework in terms of $κ_{tqZ}$ and $λ_{tqγ}$. Signal and background events are simulated using Monte Carlo techniques, including parton showering and hadronization with \texttt{Pythia} and a fast detector simulation based on \texttt{Delphes} with a dedicated 10~TeV muon collider setup. A multivariate analysis based on boosted decision trees is employed to enhance the signal discrimination. Assuming an integrated luminosity of $10~\mathrm{ab}^{-1}$, we obtain projected sensitivities to the anomalous couplings at the $\mathcal{O}(10^{-3})$ level, corresponding to branching ratio limits of $\mathcal{O}(10^{-6})$ for the rare $t \to qZ$ and $t \to qγ$ decays. These results significantly improve upon the current bounds from the CMS and ATLAS collaborations, extending the sensitivity by more than one order of magnitude. Our findings demonstrate that a multi-TeV muon collider provides a powerful and complementary platform for probing rare top-quark interactions, offering a unique opportunity to explore physics beyond the Standard Model through FCNC processes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_13562 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Sensitivity to top-quark FCNC interactions at future muon colliders Senol, A. Ozaltay, B. S. Tekin, M. Denizli, H. High Energy Physics - Phenomenology High Energy Physics - Experiment We investigate flavor-changing neutral current (FCNC) interactions of the top quark at a future muon collider with a center-of-mass energy of $\sqrt{s} = 10~\mathrm{TeV}$. The process $μ^{+}μ^{-} \to ν_μ\,μ^+\,b\,j$ and its corresponding charge conjugate are considered as a probe of anomalous $tqZ$ and $tqγ$ couplings, parametrized within an effective field theory framework in terms of $κ_{tqZ}$ and $λ_{tqγ}$. Signal and background events are simulated using Monte Carlo techniques, including parton showering and hadronization with \texttt{Pythia} and a fast detector simulation based on \texttt{Delphes} with a dedicated 10~TeV muon collider setup. A multivariate analysis based on boosted decision trees is employed to enhance the signal discrimination. Assuming an integrated luminosity of $10~\mathrm{ab}^{-1}$, we obtain projected sensitivities to the anomalous couplings at the $\mathcal{O}(10^{-3})$ level, corresponding to branching ratio limits of $\mathcal{O}(10^{-6})$ for the rare $t \to qZ$ and $t \to qγ$ decays. These results significantly improve upon the current bounds from the CMS and ATLAS collaborations, extending the sensitivity by more than one order of magnitude. Our findings demonstrate that a multi-TeV muon collider provides a powerful and complementary platform for probing rare top-quark interactions, offering a unique opportunity to explore physics beyond the Standard Model through FCNC processes. |
| title | Sensitivity to top-quark FCNC interactions at future muon colliders |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.13562 |