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An evidence for a diphoton resonance at a mass of 750 GeV has been observedin the data collected at the LHC run at a center of mass energy of 13 TeV. Weexplore several interpretations of this signal in terms of Higgs-likeresonances in a two-Higgs doublet model and its supersymmetric incarnation, inwhich the heavier CP-even and CP-odd states present in the model are producedin gluon fusion and decay into two photons through top quark loops. We showthat one cannot accommodate the observed signal in the minimal versions ofthese models and that an additional particle content is necessary. We thenconsider the possibility that vector-like quarks or leptons strongly enhancethe heavy Higgs couplings to photons and eventually gluons, without alteringthose of the already observed 125 GeV state.

Scenarii for interpretations of the LHC diphoton excess: two Higgs doublets and vector-like quarks and leptons