Higgs precision study of the 750 GeV diphoton resonance and the 125 GeV standard model Higgs boson with Higgs-singlet mixing
Abstract
We interpret the potential observation of the 750 GeV di-photon resonance at the LHC in models, in which an SU(2) isospin-singlet scalar boson mixes with the Standard Model (SM) Higgs boson through an angle α. Allowing the singlet scalar boson to have renormalizable couplings to vector-like leptons and quarks and introducing sizable decay width of the 750 GeV di-photon resonance into non-SM particles such as dark matters, we can explain the large production cross section σ(H2) × B(H2 γγ) as well as the apparent large total width of the boson without conflicts from the results obtained by previous global fits to the SM Higgs boson data.
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