Abstract
We study the Higgs phenomenology in the Peccei-Quinn invariant NMSSM (PQ-NMSSM) where the low energy mass parameters of the singlet superfield are induced by a spontaneous breakdown of the Peccei-Quinn symmetry. In the generic NMSSM, scalar mixing among CP-even Higgs bosons is constrained by the observed properties of the SM-like Higgs boson, as well as by the LEP bound on the chargino mass and the perturbativity bound on the singlet Yukawa coupling. In the minimal PQ-NMSSM, scalar mixing is further constrained due to the presence of a light singlino-like neutralino. It is noticed that the $2\sigma$ excess of the LEP $Zb\bar b$ events at $m_{b\bar b}\simeq$ 98 GeV can be explained by a singlet-like 98 GeV Higgs boson in the minimal PQ-NMSSM with low $\tan\beta$, stops around or below 1 TeV, and light doublet-higgsinos around the weak scale.
Highlights
Which would cause a fine-tuning worse than 1 % in the electroweak symmetry breaking
We study the Higgs phenomenology in the Peccei-Quinn invariant next-to-minimal supersymmetric standard model (NMSSM) (PQ-NMSSM) where the low energy mass parameters of the singlet superfield are induced by a spontaneous breakdown of the Peccei-Quinn symmetry
In the generic NMSSM, scalar mixing among CP-even Higgs bosons is constrained by the observed properties of the SMlike Higgs boson, as well as by the LEP bound on the chargino mass and the perturbativity bound on the singlet Yukawa coupling
Summary
We briefly discuss phenomenological consequences of Higgs mixing in the general NMSSM and the resultant constraints on the model. One can estimate the signal rate of the SM-like Higgs boson h at the LHC in the presence of scalar mixing. We have used that RhV V |0 is determined only by θ1, θ2, and tan β For such Higgs mixing, the signal rates for the fermionic (bb or τ τ) and di-photon channel are estimated to be. These include (a) the mass of the SM-like Higgs boson, mh ≃ 125 GeV, (b) the Higgs signal rates, in particular RhV V ≈ 1, (c) the perturbativity bound λ 0.7, and (d) the LEP bound on the chargino mass, implying |μ| 100 GeV
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