Decays of Standard Model-Like Higgs Boson h → γγ, Zγ in a Minimal Left-Right Symmetric Model

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