101. Neutral Higgs boson decays <math><mrow><mi>H</mi><mo>→</mo><mi>Z</mi><mi>γ</mi><mo>,</mo><mi>γ</mi><mi>γ</mi></mrow></math> in 3-3-1 models
- Author
-
Hung, H. T., Hong, T. T., Phuong, H. H., Mai, H. L. T., and Hue, L. T.
- Abstract
The significance of new physics appearing in the loop-induced decays of neutral Higgs bosons into pairs of dibosons γγ and Zγ will be discussed in the framework of the 3-3-1 models based on a recent work [H. Okada, N. Okada, Y. Orikasa, and K. Yagyu, Phys. Rev. D 94, 015002 (2016)], where the Higgs sector becomes effectively the same as that in the two Higgs doublet models (2HDM) after the first symmetry breaking from SU(3)L scale into the electroweak scale. For large SU(3)L scale v3≃10 TeV, dominant one-loop contributions to the two decay amplitudes arise from only the single charged Higgs boson predicted by the 2HDM, leading to that experimental constraint on the signal strength μγγ331 of the Standard Model-like Higgs boson decay h→γγ will result in a strict upper bound on the signal strength μZγ331 of the decay h→Zγ. For a particular model with lower v3 around 3 TeV, contributions from heavy charged gauge and Higgs bosons may have the same order, therefore may give strong destructive or constructive correlations. As a by-product, a deviation from the SM prediction |μγγ331−1|≤0.04 still allows |μZγ331−1| to reach values near 0.1. We also show that there exists an CP-even neutral Higgs boson h30 predicted by the 3-3-1 models, but beyond the 2HDM, has an interesting property that the branching ratio Br(h30→γγ) is very sensitive to the parameter β used to distinguish different 3-3-1 models.
- Published
- 2019