Flavor-Violating Higgs and Top Decays in the Type 1B Flavorful Two-Higgs-Doublet Model with a Twist
Abstract
We study flavor-violating decays of the SM-like Higgs boson and rare top decays in the Type 1B realization of the flavorful two-Higgs-doublet model with a twist, focusing on h→ sb, h→ db, h→ uc, h→μτ, h→ eτ, h→ eμ, t→ ch, and t→ uh. We present the relevant amplitude and branching-ratio formulae, include one-loop vertex corrections, and impose constraints from Higgs signal-strength measurements, electroweak precision tests, meson mixing, B→ Xsγ, direct HFV searches and CLFV constraints, including μ−e conversion. The surviving parameter space favors BR(h→ sb)≫BR(h→ db), BR(t→ ch)≫BR(t→ uh), and BR(h→μτ)≫BR(h→ eτ)∼BR(h→ eμ) in the lepton sector. One-loop effects usually preserve these hierarchies, but can modify individual channels through different mechanisms: sizable destructive tree--loop interference can reduce h→ sb enough to yield rare BR1L(h→ db)>BR1L(h→ sb) points, whereas the large relative corrections found in rare top decays mainly reflect strong SM-like alignment suppressing the tree-level amplitudes.
Versions
Related
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BibTeX
@misc{hou2026flavorviolating,
title = {{Flavor-Violating Higgs and Top Decays in the Type 1B Flavorful Two-Higgs-Doublet Model with a Twist}},
author = {Ti-Bin Hou and Zheng Li and Yu-Ju Peng and Jin-Lei Yang and Hao-Ran Ma and Tai-Fu Feng},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.00692},
eprint = {2609.00692},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00692},
}
RIS
TY - UNPB
TI - Flavor-Violating Higgs and Top Decays in the Type 1B Flavorful Two-Higgs-Doublet Model with a Twist
AU - Ti-Bin Hou
AU - Zheng Li
AU - Yu-Ju Peng
AU - Jin-Lei Yang
AU - Hao-Ran Ma
AU - Tai-Fu Feng
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2609.00692
UR - https://arxiv.org/abs/2609.00692
AB - We study flavor-violating decays of the SM-like Higgs boson and rare top decays in the Type 1B realization of the flavorful two-Higgs-doublet model with a twist, focusing on h→ sb, h→ db, h→ uc, h→μτ, h→ eτ, h→ eμ, t→ ch, and t→ uh. We present the relevant amplitude and branching-ratio formulae, include one-loop vertex corrections, and impose constraints from Higgs signal-strength measurements, electroweak precision tests, meson mixing, B→ X_sγ, direct HFV searches and CLFV constraints, including μ−e conversion. The surviving parameter space favors BR(h→ sb)≫BR(h→ db), BR(t→ ch)≫BR(t→ uh), and BR(h→μτ)≫BR(h→ eτ)∼BR(h→ eμ) in the lepton sector. One-loop effects usually preserve these hierarchies, but can modify individual channels through different mechanisms: sizable destructive tree--loop interference can reduce h→ sb enough to yield rare BR_1L(h→ db)>BR_1L(h→ sb) points, whereas the large relative corrections found in rare top decays mainly reflect strong SM-like alignment suppressing the tree-level amplitudes.
ER -