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

Abstract

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

Fermionic decays of NMSSM Higgs bosons under LHC 13 TeV constraints

“…In a previous study, we showed the effect of the recent constraints on the properties of the neutral Higgs bosons, such as the mass spectrum, the singlet and doublets components, the reduced couplings of such particles, and their decays and reduced cross-section to bosons [37]. This paper will show the rest of the results of the possible decays of these particles and the reduced cross-section of them to fermions.…”

“…Based on this observation, the constraints of the recent LHC Higgs data on the lightest neutral Higgs states' properties are discussed in this paper. This method was used in a previous paper to investigate the effect of the latest LHC constraints on bosonic decays of possible lightest neutral Higgs bosons in the semi-constrained NMSSM (scNMSSM) with Grand unification boundary conditions [37] and will be shortly described in Section "Scan strategy". In this paper, we will apply this method to predict the effect of the recent constraints of the LHC on fermionic decays of neutral Higgs particles in scNMSSM.…”

Dark Matter Constraints and the Neutralino Sector of the scNMSSM

“…Moreover, the Higgs sector of both papers is associated with h 2 being the SM-like Higgs boson, which is different from the parameter space to be considered in this paper in which h 1 is the SM-like. The Higgs sector of this case has been recently analyzed in [59], where only the upper limit on DM is considered.…”