Phenomenology of the inflation-inspired NMSSM at the electroweak scale

Hollik, W.; Liebler, Stefan; Moortgat‐Pick, Gudrid; Paßehr, Sebastian; Weiglein, G.

doi:10.1140/epjc/s10052-019-6561-6

“…[10,11]. The list comprises of type I 2HDMs [12,13], a radion model [14], a minimal dilaton model [15], as well as supersymmetric models [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A 96 GeV Higgs boson in the N2HDM

Biekötter

¹

,

Chakraborti

²

,

Heinemeyer

³

2020

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We discuss a ∼ 3 σ signal (local) in the light Higgs-boson search in the diphoton decay mode at ∼ 96 GeV as reported by CMS, together with a ∼ 2 σ excess (local) in the bb 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 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 ∼ 96 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.SM is the Minimal Supersymmetric Standard Model (MSSM) [19,20]. In contrast to the single Higgs doublet of the SM, the MSSM by construction, requires the presence of two Higgs doublets, Φ 1 and Φ 2 . In the CP conserving case the MSSM Higgs sector consists of two CP-even, one CP-odd and two charged Higgs bosons. The light (or the heavy) CP-even MSSM Higgs boson can be interpreted as the signal discovered at ∼ 125 GeV [21] (see Refs. [22,23] for recent updates). However, in Ref. [22] it was demonstrated that the MSSM cannot explain the CMS excess in the diphoton final state.Going beyond the MSSM, a well-motivated extension is given by the Next-to-MSSM (NMSSM) (see [24,25] for reviews). The NMSSM provides a solution for the so-called "µ problem" by naturally associating an adequate scale to the µ parameter appearing in the MSSM superpotential [26,27]. In the NMSSM a new singlet superfield is introduced, which only couples to the Higgs-and sfermion-sectors, giving rise to an effective µ-term, proportional to the vacuum expectation value (vev) of the scalar singlet. In the CP conserving case the NMSSM Higgs sector consists of three CP-even Higgs bosons, h i (i = 1, 2, 3), two CP-odd Higgs bosons, a j (j = 1, 2), and the charged Higgs boson pair H ± . In the NMSSM not only the lightest but also the second lightest CP-even Higgs boson can be interpreted as the signal observed at about 125 GeV, see, e.g., [28,29]. In Ref. [17] it was found that the NMSSM can indeed simultaeneously satisfy the two excesses mentioned above. In this case, the Higgs boson at ∼ 96 GeV has a large singlet component, but also 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 [30,31] (see for reviews). The µνSSM is the simplest extension of the MSSM that can provide massive neutrinos through a see-saw mechanism at the electroweak scale. A Yukawa coupling for right-handed ne...

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“…Combined with the 2.3σ local excess observed in the LEP searches for e + e − → Z (h → bb) [5,6], the CMS results provide a motivation to consider the possibility that the Higgs sector involves an additional scalar boson at 96 GeV, which has been studied recently in Refs. [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Light Higgs bosons in the general NMSSM

Choi

¹

,

Im

²

,

Jeong

³

et al. 2019

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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 − → Z (h → bb), 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.

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“…[9,10]. The list comprises of type I 2HDMs [11,12], a radion model [13], a minimal dilaton model [14], as well as supersymmetric models [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

An N2HDM Solution for the possible 96 GeV Excess

Heinemeyer¹,

Biekoetter²,

Chakraborti³

2019

Proceedings of Corfu Summer Institute 2018 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2018)

5

1

0

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We discuss a ∼ 3 σ signal (local) in the light Higgs-boson search in the diphoton decay mode at ∼ 96 GeV as reported by CMS, together with a ∼ 2 σ excess (local) in the bb final state at LEP in the same mass range. We review the interpretation of this possible signal as a Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). It is shown that the lightest Higgs boson of the N2HDM can perfectly fit both excesses simultaneously, while the full Higgs-boson sector is in agreement with all Higgs-boson measurements and exclusion bounds as well as other theoretical and experimental constraints. It is demonstrated that in particular the N2HDM type II and can fit the data best, leading to a supersymmetric interpretation. The NMSSM and the µνSSM are briefly reviewed in this respect. An N2HDM Solution for the possible 96 GeV Excess S. Heinemeyer model (N2HDM) [24,25] was investigated. In this model the two Higgs doublets are supplemented with a real Higgs singlet, giving rise to one additional (potentially light) C P-even Higgs boson. However, in comparison to SUSY models the N2HDM does not have to obey the SUSY relations in the Higgs-boson sector. Consequently, it allows to study how the potential fits the two excesses simultaneously in a more general way. Here we review first the results obtained in the N2HDM [23] and then two possible SUSY realizations.

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Phenomenology of the inflation-inspired NMSSM at the electroweak scale

Cited by 42 publications

References 164 publications

A 96 GeV Higgs boson in the N2HDM

A 96 GeV Higgs boson in the N2HDM

Light Higgs bosons in the general NMSSM

An N2HDM Solution for the possible 96 GeV Excess

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