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We analyze the Next-to-minimal supersymmetric standard model with Grandunification boundary conditions under current theoretical and experimentalconstraints. We compute the mass spectrum of the model and focus on the threelightest particles in the Higgs sector (two CP-even scalars, $h_1, h_2$, andone CP-odd, $a_1$). The reduced couplings of such particles, singlet-doubletcomponents, their branching ratios to bosons, and reduced cross-section tophotons and massive gauge bosons via gluon fusion are thoroughly andsystematically scrutinized. Our analysis is focused on the parameter spacewhere the singlet-doublet coupling $\lambda$ is as large as possible (keepingthe perturbativity bound intact) and the ratio between the vacuum expectationvalues of the up-type and down-type Higgses ($\tan{\beta}$) is as small aspossible, which is the region representing the most natural case of the NMSSM.We show the impact of recent constraints from the LHC on the SM-Higgs couplingsto bosons and fermions on the parameter space of the model and the consequentimplications on the Higgs sector. The results show that while the model isstill able to account for current data and provide an opportunity for discoveryof extended Higgs sectors, recent LHC Higgs couplings constraints rule-outparts of the parameter space where $h_2$ (non-SM-like) and $a_1$ arenon-singlet with masses below ~400 GeV.

Impact of LHC Higgs couplings measurements on bosonic decays of the neutral Higgs sector in the scNMSSM