Top-quark flavor-changing neutral currents and charged-lepton flavor violation in a generational three-Higgs-doublet model
Abstract
In this work, we systematically investigate top-quark flavor-changing neutral-current decays, charged-lepton flavor-violating processes, and coherent μ−e conversion in the CP-conserving generational three-Higgs-doublet model (G3HDM), including the relevant tree-level and one-loop contributions. The 4839-point sample passes conservative sufficient vacuum-stability conditions, necessary perturbative-unitarity preselection cuts, Higgs-mass and signal-strength constraints, electroweak precision data, the UTfit 2025 neutral-meson-mixing ranges, B̅→ Xsγ, and Bs→μ+μ-. In the scanned region, Br(t→ c h1)≤ 1.04×10−5 and Br(h1→μτ)≤ 4.83×10−4, while the maximal conversion rates are CR(μAl→ eAl)≈ 4.95×10−15 and CR(μAu→ eAu)≈ 1.05×10−14. The dominant collider signals are mainly driven by tree-level flavor-changing neutral-Higgs couplings, which determine the relative strengths of these processes and induce the pronounced enhancement of t→ c h1 and h1→μτ. Meanwhile, the upper range of the predicted μ−e conversion rate in aluminum lies within the sensitivity reach of next-generation μ−e conversion experiments.
Related
- Search for top quark flavor-changing neutral currents in multilepton final states using an effective field theory approach in proton--proton collisions at √s = 13 TeV
- Probing strange-sector flavor-changing neutral currents at DUNE-like facilities
- Chaos bound violation and greybody factors of charged-AdS black holes surrounded by dark matter halos and quintessence
- Charged Lepton Flavor Violation: A Theory Overview
- Searching for Charged Lepton Flavor Violation
BibTeX
@misc{ma2026topquark,
title = {{Top-quark flavor-changing neutral currents and charged-lepton flavor violation in a generational three-Higgs-doublet model}},
author = {Hao-Ran Ma and Ti-Bin Hou and Yu-Ju Peng and Jin-Lei Yang and Tai-Fu Feng},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08350},
eprint = {2609.08350},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08350},
}
RIS
TY - UNPB
TI - Top-quark flavor-changing neutral currents and charged-lepton flavor violation in a generational three-Higgs-doublet model
AU - Hao-Ran Ma
AU - Ti-Bin Hou
AU - Yu-Ju Peng
AU - Jin-Lei Yang
AU - Tai-Fu Feng
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08350
UR - https://arxiv.org/abs/2609.08350
AB - In this work, we systematically investigate top-quark flavor-changing neutral-current decays, charged-lepton flavor-violating processes, and coherent μ−e conversion in the CP-conserving generational three-Higgs-doublet model (G3HDM), including the relevant tree-level and one-loop contributions. The 4839-point sample passes conservative sufficient vacuum-stability conditions, necessary perturbative-unitarity preselection cuts, Higgs-mass and signal-strength constraints, electroweak precision data, the UTfit 2025 neutral-meson-mixing ranges, B̅→ X_sγ, and B_s→μ^+μ^-. In the scanned region, Br(t→ c h_1)≤ 1.04×10^−5 and Br(h_1→μτ)≤ 4.83×10^−4, while the maximal conversion rates are CR(μAl→ eAl)≈ 4.95×10^−15 and CR(μAu→ eAu)≈ 1.05×10^−14. The dominant collider signals are mainly driven by tree-level flavor-changing neutral-Higgs couplings, which determine the relative strengths of these processes and induce the pronounced enhancement of t→ c h_1 and h_1→μτ. Meanwhile, the upper range of the predicted μ−e conversion rate in aluminum lies within the sensitivity reach of next-generation μ−e conversion experiments.
ER -