Abstract
We discuss a sim 3,sigma signal (local) in the light Higgs-boson search in the diphoton decay mode at sim 96 ,, mathrm {GeV} as reported by CMS, together with a sim 2,sigma excess (local) in the b {{bar{b}}} final state at LEP in the same mass range. We interpret this possible signal as a Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We find that the lightest Higgs boson of the N2HDM can perfectly fit both excesses simultaneously, while the second lightest state is in full agreement with the Higgs-boson measurements at 125 ,, mathrm {GeV}, and the full Higgs-boson sector is in agreement with all Higgs exclusion bounds from LEP, the Tevatron and the LHC as well as other theoretical and experimental constraints. We show that only the N2HDM type II and IV can fit both the LEP excess and the CMS excess with a large ggF production component at sim 96 ,, mathrm {GeV}. We derive bounds on the N2HDM Higgs sector from a fit to both excesses and describe how this signal can be further analyzed at the LHC and at future e^+e^- colliders, such as the ILC.
Highlights
Where the signal strength μLEP is the measured cross section normalized to the SM expectation, with the SM Higgs-boson mass at ∼ 98 GeV
We discuss a ∼ 3 σ signal in the light Higgs-boson search in the diphoton decay mode at ∼ 96 GeV as reported by CMS, together with a ∼ 2 σ excess in the bbfinal state at LEP in the same mass range. We interpret this possible signal as a Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM)
We find that the lightest Higgs boson of the N2HDM can perfectly fit both excesses simultaneously, while the second lightest state is in full agreement with the Higgs-boson measurements at 125 GeV, and the full Higgsboson sector is in agreement with all Higgs exclusion bounds from LEP, the Tevatron and the LHC as well as other theoretical and experimental constraints
Summary
[26] it was found that the NMSSM can simultaneously satisfy the two excesses mentioned above In this case, the Higgs boson at ∼ 96 GeV has a large singlet component, and a sufficiently large doublet component to give rise to the two excesses. A natural extension of the NMSSM is the μνSSM, in which the singlet superfield is interpreted as a right-handed neutrino superfield [37,38] [25] it was found that the μνSSM can fit the CMS and the LEP excesses simultaneously In this case the scalar at ∼ 96 GeV has a large right-handed sneutrino component. In comparison with the NMSSM and the μνSSM the N2HDM does not have to obey the SUSY relations in the Higgs-boson sector It allows to study how the potential fits the two excesses simultaneously in a more general way.
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