Masses and couplings of the lightest Higgs bosons in (M + 1)SSM

Ellwanger, Ulrich; Hugonie, Cyril

doi:10.1007/s10052-002-0980-4

Cited by 87 publications

(101 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Second, a Higgs state with a sizeable singlet component can have a mass well below the lower LEP-bound of 114.7 GeV on a SM-like Higgs mass [6][7][8], without violating corresponding constraints [5] on its coupling to the Z boson. (Here we do not consider regions in parameter space where unconventional Higgs decays here could be possible.)…”

Section: Introductionmentioning

confidence: 99%

Enhanced di-photon Higgs signal in the Next-to-Minimal Supersymmetric Standard Model

Ellwanger¹

2011

Physics Letters B

View full text Add to dashboard Cite

In the Next-to-Minimal Supersymmetric Standard Model, CP-even Higgs bosons can have masses in the range of 80 − 110 GeV in agreement with constraints from LEP due to their sizeable singlet component. Nevertheless their branching ratio into two photons can be more than 10 times larger than the one of a Standard Model Higgs boson of similar mass due to a reduced coupling to b quarks. This can lead to a spectacular enhancement of the Higgs signal rate in the di-photon channel at hadron colliders by a factor 6. Corresponding scenarios can occur in the Next-to-Minimal Supersymmetric Standard Model for a relatively low Susy breaking scale.

show abstract

Section: Introductionmentioning

confidence: 99%

Enhanced di-photon Higgs signal in the Next-to-Minimal Supersymmetric Standard Model

Ellwanger¹

2011

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…A possible cosmological domain wall problem [4] can be avoided by introducing suitable nonrenormalizable operators [5] that do not generate dangerously large singlet tadpole diagrams [6]. Hence, the phenomenology of the NMSSM deserves to be studied at least as fully and precisely as that of the MSSM.Radiative corrections to the Higgs masses have been computed [7,8,9,10] The extent to which there is a no-lose theorem for NMSSM Higgs discovery at the LHC has arisen as an important topic [13,17,18,19,20]. In particular, it has been found that the Higgs to Higgs pair decay modes can render inadequate the usual MSSM Higgs search modes that give rise to a no-lose theorem for MSSM Higgs discovery at the LHC.…”

mentioning

confidence: 99%

“…Radiative corrections to the Higgs masses have been computed [7,8,9,10] The extent to which there is a no-lose theorem for NMSSM Higgs discovery at the LHC has arisen as an important topic [13,17,18,19,20]. In particular, it has been found that the Higgs to Higgs pair decay modes can render inadequate the usual MSSM Higgs search modes that give rise to a no-lose theorem for MSSM Higgs discovery at the LHC.…”

mentioning

confidence: 99%

Escaping the Large Fine-Tuning and Little Hierarchy Problems in the Next to Minimal Supersymmetric Model andh→aaDecays

2005

View full text Add to dashboard Cite

We demonstrate that the NMSSM can have small fine-tuning and modest light stop mass while still evading all experimental constraints. For small tan β (large tan β), the relevant scenarios are such that there is always (often) a SM-like Higgs boson that decays to two lighter -possibly much lighter -pseudoscalar Higgses.In the CP-conserving Minimal Supersymmetric Model (MSSM), large soft-supersymmetry-breaking mass parameters are required in order that the one-loop corrections to the tree-level prediction for the lightest Higgs boson (m h ≤ m Z ) increase m h sufficiently to avoid conflict with lower bounds from LEP data. The large size of these soft-SUSY breaking masses compared to the weak scale, the natural scale where supersymmetry is expected, is termed the little-hierarchy problem. This hierarchy implies that a substantial amount of fine-tuning of the MSSM soft-SUSY breaking parameters is needed. The severity of these problems has led to a variety of alternative approaches. For instance, little Higgs models [1] can be less fine tuned. Or, one can argue that large fine-tuning is not so bad, as in "split-supersymmetry" [2]. In this letter, we show that the Next to Minimal Supersymmetric Model (NMSSM [3]) can avoid or at least ameliorate the fine-tuning and little hierarchy problems. In addition, we find that parameter choices that are consistent with all LEP constraints and that yield small fine-tuning at small tan β (large tan β) are nearly always (often) such that there is a relatively light SM-like CP-even Higgs boson that decays into two light, perhaps very light, pseudoscalars. Such decays dramatically complicate the Tevatron and LHC searches for Higgs bosons.The NMSSM is very attractive in its own right. It provides a very elegant solution to the µ problem of the MSSM via the introduction of a singlet superfield S. For the simplest possible scale invariant form of the superpotential, the scalar component of S naturally acquires a vacuum expectation value of the order of the SUSY breaking scale, giving rise to a value of µ of order the electroweak scale. The NMSSM is the simplest supersymmetric extension of the standard model in which the electroweak scale originates from the SUSY breaking scale only. A possible cosmological domain wall problem [4] can be avoided by introducing suitable nonrenormalizable operators [5] that do not generate dangerously large singlet tadpole diagrams [6]. Hence, the phenomenology of the NMSSM deserves to be studied at least as fully and precisely as that of the MSSM.Radiative corrections to the Higgs masses have been computed [7,8,9,10] The extent to which there is a no-lose theorem for NMSSM Higgs discovery at the LHC has arisen as an important topic [13,17,18,19,20]. In particular, it has been found that the Higgs to Higgs pair decay modes can render inadequate the usual MSSM Higgs search modes that give rise to a no-lose theorem for MSSM Higgs discovery at the LHC. And, it is by no means proven that the Higgs to Higgs pair modes are directly observable at the LHC, althou...

show abstract

“…In this context, NMSSM has been discussed in the literature [14][15][16][17][18][19][20]. In the pre-discovery era, NMSSM was discussed mainly as a scenario allowing for a Higgs mass significantly above the values predicted by the MSSM [21][22][23][24][25]. The attention has been mostly focused on the new tree-level contribution to the Higgs mass coming from the singlet-doublet-doublet coupling in the superpotential, λSH u H d , which can be significant for low tan β values and O(1) values of λ.…”

Section: Introductionmentioning

confidence: 99%

New regions in the NMSSM with a 125 GeV Higgs

Badziak

Olechowski

Pokorski

2013

J. High Energ. Phys.

View full text Add to dashboard Cite

It is pointed out that mixing effects in the CP-even scalar sector of the NMSSM can give 6-8 GeV correction to the SM-like Higgs mass in moderate or large tan β regions with a small value of the singlet-higgs-higgs superfields coupling λ ∼ O(0.1). This effect comes mainly from the mixing of the SM-like Higgs with lighter singlet. In the same parameter range, the mixing of the heavy doublet Higgs with the singlet may strongly modify the couplings of the singlet-like and the 125 GeV scalars. Firstly, the LEP bounds on a light singlet can be evaded for a large range of its masses. Secondly, the decay rates of both scalars can show a variety of interesting patterns, depending on the lightest scalar mass. In particular, a striking signature of this mechanism can be a light scalar with strongly suppressed (enhanced) branching ratios to bb (gg, cc, γγ) as compared to the SM Higgs with the same mass. The γγ decay channel is particularly promising for the search of such a scalar at the LHC. The 125 GeV scalar can, thus, be accommodated with substantially smaller than in the MSSM radiative corrections from the stop loops (and consequently, with lighter stops) also for moderate or large tan β, with the mixing effects replacing the standard NMSSM mechanism of increasing the tree level Higgs mass in the low tan β and large λ regime, and with clear experimental signatures of such a mechanism.

show abstract

Masses and couplings of the lightest Higgs bosons in (M + 1)SSM

Cited by 87 publications

References 14 publications

Enhanced di-photon Higgs signal in the Next-to-Minimal Supersymmetric Standard Model

Enhanced di-photon Higgs signal in the Next-to-Minimal Supersymmetric Standard Model

Escaping the Large Fine-Tuning and Little Hierarchy Problems in the Next to Minimal Supersymmetric Model andh→aaDecays

New regions in the NMSSM with a 125 GeV Higgs

Contact Info

Product

Resources

About