Higgs boson decays h→ Z γ and h→ mV Z in the U(1)XVLFM

We study the Higgs boson decays h → Zγ h → Z γ and h → mVZ h → m V Z in a model with vectorlike fermions and U(1)X U ( 1 ) X symmetry ( U(1)X U ( 1 ) X VLFM), where mV m V is a vector meson ( ρ ,\ ω ,\ φ ,\ J/ψ ,\ Υ 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 hγ Z h γ Z couplings come from loop diagrams that involve the new particles, and these corrections have a clear impact on the decay rates of h→ Zγ h → Z γ and h→ mVZ h → m V Z . In suitable regions of the parameter space, the model can produce non-negligible deviations in Γ NP(h→ Zγ )/Γ SM(h→ Zγ ) Γ NP ( h → Z γ ) / Γ SM ( h → Z γ ) and Γ NP(h→ mVZ)/Γ SM(h→ mV Z) Γ NP ( h →