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

Abstract

Two decay channels $h\to \gamma \gamma ,Z\gamma$ 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 $h\to Z\gamma$ amplitude, but not the $h\to \gamma \gamma$ amplitude. From numerical investigations, we show that the signal strength ${\mu }_{Z\gamma }$ of the decay $h\to Z\gamma$ is still constrained strictly by that of $h\to \gamma \gamma$, 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 $|\Delta {\mu }_{Z\gamma }|=23\%$.

Comments: 23 pages, 6 figures