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

Abstract

This paper mainly investigates the Higgs boson decays h → Zγ and h → m V Z in the U (1) X SSM model, with m V denoting ω, ρ, φ, J/ψ and Υ. The CP-even and CP-odd hγZ couplings are corrected by the new particle loop diagrams. Using the effective Lagrangian method, we calculate the effective constants C γZ and CγZ for the vertex hγZ. Numerically, the ratio Γ U (1) X (h → Zγ)/Γ SM (h → Zγ) is within 1.02 − 1.35. For the vector meson ω, ρ, φ and J/ψ, the ratio Γ U (1) X (h → m V Z)/Γ SM (h → m V Z) is mainly distributed in the range 1.01 − 1.45. When m V represents Υ, the larger value of the ratio Γ U (1) X (h → ΥZ)/Γ SM (h → ΥZ) is mostly located in the range 1.002 − 1.30. This work would encourage a detection on h → Zγ at LHC for finding NP beyond SM.