Searching for Lepton Flavor Violating decays of the Higgs Boson into $μτ$, $eτ$, and $eμ$ final states at FCC-ee
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| Format: | Preprint |
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2026
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| _version_ | 1866914616107335680 |
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| author | Sriling, P. Srimanobhas, N. Uttayarat, P. Uttho, R. Wachirapusitanand, V. |
| author_facet | Sriling, P. Srimanobhas, N. Uttayarat, P. Uttho, R. Wachirapusitanand, V. |
| contents | We investigate the projected sensitivity of the FCC-ee in probing the LFV decay of the 125 GeV Higgs boson, $h\toμτ$, $h\to eτ$, and $h \to eμ$ at center-of-mass energy of 240 GeV with an integrated luminosity of 5 ab$^{-1}$. With the clean multi-lepton final states, we consider the Higgs production modes that contribute to $e^+e^- \to \ell\ell h$, in particular, the Higgs-strahlung and the vector boson fusion production channels. The 95\% CL upper limits on branching ratio are found to be $5.92 \times 10^{-4}$, $6.27 \times 10^{-4}$, and $7.48 \times 10^{-5}$ for the channels $h\toμτ$, $h\to eτ$, and $h \to eμ$, respectively. In addition, we also consider the LFV decay of a new CP-even Higgs boson with mass in the range of $110-200$ GeV. The projected FCC-ee sensitivities are then compared to those from low energy searches for $\ell\to\ell'γ$ decay. We find that the FCC-ee sensitivity for the LFV decays of the Higgs in the $e-τ$ and $μ-τ$ channels is superior to the low-energy constraints. However, in the $e-μ$ case, the low energy search offers stronger constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_30971 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Searching for Lepton Flavor Violating decays of the Higgs Boson into $μτ$, $eτ$, and $eμ$ final states at FCC-ee Sriling, P. Srimanobhas, N. Uttayarat, P. Uttho, R. Wachirapusitanand, V. High Energy Physics - Phenomenology High Energy Physics - Experiment We investigate the projected sensitivity of the FCC-ee in probing the LFV decay of the 125 GeV Higgs boson, $h\toμτ$, $h\to eτ$, and $h \to eμ$ at center-of-mass energy of 240 GeV with an integrated luminosity of 5 ab$^{-1}$. With the clean multi-lepton final states, we consider the Higgs production modes that contribute to $e^+e^- \to \ell\ell h$, in particular, the Higgs-strahlung and the vector boson fusion production channels. The 95\% CL upper limits on branching ratio are found to be $5.92 \times 10^{-4}$, $6.27 \times 10^{-4}$, and $7.48 \times 10^{-5}$ for the channels $h\toμτ$, $h\to eτ$, and $h \to eμ$, respectively. In addition, we also consider the LFV decay of a new CP-even Higgs boson with mass in the range of $110-200$ GeV. The projected FCC-ee sensitivities are then compared to those from low energy searches for $\ell\to\ell'γ$ decay. We find that the FCC-ee sensitivity for the LFV decays of the Higgs in the $e-τ$ and $μ-τ$ channels is superior to the low-energy constraints. However, in the $e-μ$ case, the low energy search offers stronger constraints. |
| title | Searching for Lepton Flavor Violating decays of the Higgs Boson into $μτ$, $eτ$, and $eμ$ final states at FCC-ee |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.30971 |