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, $h_1,h_2$, and one CP-odd, $a_1$). 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 $\lambda$ 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 ($\tan \beta$) 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 $h_2$ (non-SM-like) and $a_1$ are non-singlet with masses below ~400 GeV.

MPLA accepted version

References in corpus (10)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Supersymmetry without a Light Higgs Boson
• The NMSSM Solution to the Fine-Tuning Problem, Precision Electroweak Constraints and the Largest LEP Higgs Event Excess
• Discovery Prospects for NMSSM Higgs Bosons at the High-Energy Large Hadron Collider
• The semi-constrained NMSSM satisfying bounds from the LHC, LUX and Planck
• The NMSSM is within Reach of the LHC: Mass Correlations & Decay Signatures
• Bayesian analysis and naturalness of (Next-to-)Minimal Supersymmetric Models
• A Novel Scenario in the Semi-constrained NMSSM
• Future Prospects for the Minimal Supersymmetric Standard Model

Cited by in corpus (4)

• Dark matter constraints and the neutralino sector of the scNMSSM
• Fermionic decays of NMSSM Higgs bosons under LHC 13 TeV constraints
• Invisible dark matter decays of a non-Standard Model like CP-even scalar boson
• Di-Higgs Production and Trilinear Higgs Self-Coupling in the scNMSSM: Qualitative Implications for the Electroweak Phase Transition at large λ and Low tan\b{eta}