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arXiv · 2511.19337

Lepton flavor violation in Higgs boson decays at the HL-LHC

M. A. Arroyo-Ureña·E. A. Herrera-Chacón·Iran Melendez-Hernández·S. Rosado-Navarro
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Abstract

We explore the discovery potential for lepton flavor-violating Higgs boson decays, $h \to \ell_i \ell_j$ ($\ell_i \neq \ell_j$; $\ell = e, μ, τ$), in proton-proton collisions. The analysis is performed within a Froggatt-Nielsen framework, which offers a well-motivated theoretical mechanism for such processes. By performing a systematic scan over the phenomenologically viable parameter space, we identify regions that can yield observable signatures at the High-Luminosity LHC (HL-LHC). For an integrated luminosity of $\mathcal{L}_{\rm int} \gtrsim 1000~\text{fb}^{-1}$, we project that the channels $h \to eμ$ and $h \to τμ$ (with $τ^{\pm} \to π^{\pm} ν_τ$) could reach the $5σ$ discovery threshold, while $h \to τe$ remains inaccessible even at $3000~\text{fb}^{-1}$. Our results highlight the unique capability of the HL-LHC to probe new physics through searches for rare Higgs decays.

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M. A. Arroyo-Ureña, E. A. Herrera-Chacón, Iran Melendez-Hernández, S. Rosado-Navarro. 2026-02-25. Lepton flavor violation in Higgs boson decays at the HL-LHC. https://arxiv.org/abs/2511.19337

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