Decays of Standard Model like Higgs boson $h \rightarrow\gamma\gamma, Z \gamma$ in a minimal left-right symmetric model

Abstract

Two decay channels $h\rightarrow \gamma \gamma, Z\gamma$ of the Standard Model-like Higgs in a left-right symmetry model are investigated under recent experimental data. We will show there exist one-loop contributions that affect the $h\rightarrow Z\gamma$ amplitude, but not the $h\rightarrow \gamma\gamma$ amplitude. From numerical investigations, we show that the signal strength $\mu_{Z \gamma}$ of the decay $h\rightarrow Z\gamma$ is still constrained strictly by that of $h\rightarrow \gamma\gamma$, namely $|\Delta \mu_{\gamma \gamma}|<38\%$ results in max $|\Delta \mu_{Z \gamma}|<46\%$. On the other hand, the future experimental sensitivity $|\Delta \mu_{\gamma \gamma}|=4\%$ still allows $|\Delta \mu_{Z \gamma}|$ reaches to values larger than the expected sensitivity $|\Delta \mu_{Z \gamma}|=23\%$.