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

We analyze the Next-to-minimal supersymmetric standard model with Grand unification boundary conditions under current theoretical and experimental constraints. compute mass spectrum of focus on three lightest particles in Higgs sector (two CP-even scalars, $h_1, h_2$, one CP-odd, $a_1$). The reduced couplings such particles, singlet-doublet components, their branching ratios to bosons, cross-section photons massive gauge bosons via gluon fusion are thoroughly systematically scrutinized. Our analysis is focused parameter space where coupling $\lambda$ as large possible (keeping perturbativity bound intact) ratio between vacuum expectation values up-type down-type Higgses ($\tan{\beta}$) small possible, which region representing most natural case NMSSM. show impact recent constraints from LHC SM-Higgs fermions consequent implications sector. results that while still able account for data provide an opportunity discovery extended sectors, rule-out parts $h_2$ (non-SM-like) $a_1$ non-singlet masses below ~400 GeV.