Abstract
Physics beyond the Standard Model (SM) may manifest itself as small deviations from the SM predictions for Higgs signal strengths at 125 GeV. Then, a plausible and interesting possibility is that the Higgs sector is extended and at the weak scale there appears an additional Higgs boson weakly coupled to the SM sector. Combined with the LEP excess in e^+e^-rightarrow Z(hrightarrow bbar{b}), the diphoton excess around 96 GeV recently reported by CMS may suggest such a possibility. We examine if those LEP and CMS excesses can be explained simultaneously by a singlet-like Higgs boson in the general next-to-minimal supersymmetric Standard Model (NMSSM). Higgs mixing in the NMSSM relies on the singlet coupling to the MSSM Higgs doublets and the higgsino mass parameter, and thus is subject to the constraints on these supersymmetric parameters. We find that the NMSSM can account for both the LEP and CMS excesses at 96 GeV while accommodating the observed 125 GeV SM-like Higgs boson. Interestingly, the required mixing angles constrain the heavy doublet Higgs boson to be heavier than about 500 GeV. We also show that the viable region of mixing parameter space is considerably modified if the higgsino mass parameter is around the weak scale, mainly because of the Higgs coupling to photons induced by the charged higgsinos.
Highlights
Extended with an additional gauge singlet scalar, the Higgs sector of the next-to-minimal supersymmetric Standard Model (NMSSM) offers a rich phenomenology to be explored at collider experiments
As experimentally allowed to be light, a singlet-like Higgs boson could be observable in the searches for e+e− → Z (h → bb) and pp → h → γ γ if it couples to the Standard Model (SM) sector via the Higgs mixing
For the case that the gauginos, squarks and sleptons have masses above TeV, while the Higgsinos can be significantly lighter, which is perfectly consistent with the null results for SUSY searches at LHC so far, we have found that the general NMSSM can successfully accommodate such a light singletlike Higgs boson explaining the LEP and CMS excesses simultaneously, as well as the 125 GeV Higgs boson compatible with the current LHC data
Summary
Taking an appropriate redefinition of superfields, one can always write the superpotential of the general NMSSM as. Hu and Hd are the Higgs doublet superfields, and S is the gauge singlet superfield. There are various types of NMSSM, depending on the form of the singlet superpotential f (S). Our subsequent discussion applies for a general form of f (S), but for simplicity we will assume no CP violation in the Higgs sector. Where Hu0 = v sin β and Hd0 = v cos β with v = 174 GeV, and Aλ is the SUSY breaking trilinear coupling. With the above Higgs potential terms, the effective Higgs μ and
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