arXiv subjects

Yue-Tong Liu

Publications and source records attributed to Yue-Tong Liu.

2 recordsLinked to original sources

arXiv2026

Pair production of $h$ in the $U(1)_X$SSM

Higgs pair production provides an important probe of the Higgs self-interaction and the Higgs potential structure. We study the lightest neutral Higgs pair production process $gg \to hh$ via gluon fusion at the 14 TeV LHC, in the $U(1)_X$ supersymmetric standard model. As a $U(1)$ extension of the minimal supersymmetric standard model (MSSM), this model introduces new superfields that bring additional one-loop contributions to the production amplitude. We analyze the parameter dependence of the cross section numerically and present contour distributions in two-dimensional parameter planes. The results indicate that the gauge couplings $g_X$ and $g_{YX}$ are the most sensitive parameters, and the model yields sizable new physics corrections under current experimental constraints. This work helps to understand Higgs physics in the $U(1)_X$SSM and guides new physics searches at the high-luminosity LHC.

hep-ph↗

arXiv2026

Higgs boson decays $h\rightarrow Z γ$ and $h\rightarrow m_V Z$ in the $U(1)_X$VLFM

We study the Higgs boson decays $h \to Zγ$ and $h \to m_VZ$ in a model with vectorlike fermions and $U(1)_X$ symmetry ($U(1)_X$VLFM), where $m_V$ is a vector meson ($ρ,\ ω,\ ϕ,\ J/ψ,\ Υ$). The exotic Yukawa interactions in this model generate mixing between Standard Model (SM) fermions and vectorlike fermions, and this mixing affects the Higgs boson mass and Higgs couplings. The corrections to the CP-even and CP-odd $hγZ$ couplings come from loop diagrams that involve the new particles, and these corrections have a clear impact on the decay rates of $h\to Zγ$ and $h\to m_VZ$. In suitable regions of the parameter space, the model can produce non-negligible deviations in $Γ_{\rm NP}(h\to Zγ)/Γ_{\rm SM}(h\to Zγ)$ and $Γ_{\rm NP}(h\to m_VZ)/Γ_{\rm SM}(h\to m_V Z)$, providing possible signals of new physics (NP) beyond the SM.

hep-ph↗