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

TL;DR

This paper analyzes Higgs boson decays into Z gamma and meson Z in the $U(1)_X$SSM, calculating effective constants and decay ratios, which are slightly enhanced compared to the Standard Model, providing predictions for LHC searches.

Contribution

The study introduces a detailed calculation of Higgs decay ratios in the $U(1)_X$SSM, incorporating new particle loop effects and offering specific numerical predictions for experimental testing.

Findings

Decay ratios are increased by 2-35% for $h ightarrow Z \gamma$.

Decay ratios for meson channels range from 1.01 to 1.45 times the SM.

Predicted enhancements can guide LHC decay process searches.

Abstract

We present a detailed analysis of the Higgs boson decays $h\rightarrow Z \gamma$ and $h\rightarrow m_V Z$ in the $U(1)_X$SSM, with $m_V$ denoting the meson ($\omega,\rho,\phi,J/{\psi},\Upsilon$). Using the effective Lagrangian method, we calculate the effective constants $C_{\gamma Z}$ (CP-even) and $\tilde{C}_{\gamma Z}$ (CP-odd) for the vertex $h \gamma Z$, which are corrected by the new particle loop diagrams. Numerically, the ratio ${\Gamma}_{U(1)_X}(h\rightarrow Z \gamma )/{\Gamma}_{SM}(h\rightarrow Z \gamma)$ is between $1.02-1.35$. For the vector mesons $\omega,\rho,\phi$ and $J/{\psi}$, the ratios ${\Gamma}_{U(1)_X}(h\rightarrow m_V Z )/{\Gamma}_{SM}(h\rightarrow m_V Z)$ are mainly distributed in the range of ($1.01-1.45$). When $m_V$ represents $\Upsilon$, the larger value of the ratio ${\Gamma}_{U(1)_X}(h\rightarrow \Upsilon Z )/{\Gamma}_{SM}(h\rightarrow \Upsilon Z)$ is mostly located in the range of ($1.002-1.30$). This work can provide a reference for specific types of decay processes which can be searched in LHC.