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The observation of diphoton excess around the mass of 750 GeV in LHC Run-IImotivates us to consider whether the singlet Higgs boson in the custodial Higgstriplet model can serve as a good candidate because an earlier study ofcomprehensive parameter scan shows that it can have the right mass in theviable mass spectra. By assuming the singlet Higgs mass at 750 GeV, its totalwidth less than 50 GeV and imposing constraints from the LHC 8-TeV data, weidentify an approximately linear region on the $(v_\Delta, \alpha)$ plane alongwhich the exotic Higgs boson masses satisfy a specific hierarchy and have lowerpossible spectra, where $v_\Delta$ denotes the triplet vacuum expectation valueand $\alpha$ is the mixing angle between the singlet Higgs boson and thestandard model-like Higgs boson. Although the diphoton decay rate can beenhanced by charged Higgs bosons running in the loop in this region, it ismostly orders of magnitude smaller than that required for the observedproduction rate, except for the small $v_\Delta$ region when the diphotonfusion production mechanism becomes dominant. Nonetheless, this part ofparameter space suffers from the problems of breakdown of perturbativity andlarge uncertainties in the photon parton distribution function of proton.

Can the 750-GeV diphoton resonance be the singlet Higgs boson of custodial Higgs triplet model?