Light axion within the next-to-minimal supersymmetric standard model

Dobrescu, Bogdan A.; Matchev, K.

doi:10.1088/1126-6708/2000/09/031

Cited by 165 publications

(150 citation statements)

References 37 publications

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“…In Ref. [35], it was determined that the A terms provide the dominant contribution for 10 −3 < ∼ |A λ,κ |/v ≪ 1, which we satisfy. The mass of the R-axion due to the A terms is given in terms of an expansion in A λ,κ /v by…”

Section: Higgs Sector: κSusysupporting

confidence: 56%

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Supersymmetry with light stops

Larsen

Nomura

Roberts

2012

J. High Energ. Phys.

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Recent LHC data, together with the electroweak naturalness argument, suggest that the top squarks may be significantly lighter than the other sfermions. We present supersymmetric models in which such a split spectrum is obtained through "geometries": being "close to" electroweak symmetry breaking implies being "away from" supersymmetry breaking, and vice versa. In particular, we present models in 5D warped spacetime, in which supersymmetry breaking and Higgs fields are located on the ultraviolet and infrared branes, respectively, and the top multiplets are localized to the infrared brane. The hierarchy of the Yukawa matrices can be obtained while keeping near flavor degeneracy between the first two generation sfermions, avoiding stringent constraints from flavor and CP violation. Through the AdS/CFT correspondence, the models can be interpreted as purely 4D theories in which the top and Higgs multiplets are composites of some strongly interacting sector exhibiting nontrivial dynamics at a low energy. Because of the compositeness of the Higgs and top multiplets, Landau pole constraints for the Higgs and top couplings apply only up to the dynamical scale, allowing for a relatively heavy Higgs boson, including m h = 125 GeV as suggested by the recent LHC data. We analyze electroweak symmetry breaking for a well-motivated subset of these models, and find that fine-tuning in electroweak symmetry breaking is indeed ameliorated. We also discuss a flat space realization of the scenario in which supersymmetry is broken by boundary conditions, with the top multiplets localized to a brane while other matter multiplets delocalized in the bulk.

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Section: Higgs Sector: κSusysupporting

confidence: 56%

“…In the right figure, we see that as we increase tan β, singlet-doublet mixing sets in at lower λ than doublet-doublet mixing but that both are important in lowering the Higgs mass below Eq. (35).…”

Section: Higgs Sector: κSusymentioning

confidence: 99%

Supersymmetry with light stops

Larsen

Nomura

Roberts

2012

J. High Energ. Phys.

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“…These states can be relatively light; if the additional NMSSM-specific CP-even Higgs boson mixes very little with the Higgs bosons H u and H d of the MSSM, it will have very small couplings to SM gauge bosons, quarks and leptons and is hence much less constrained by the so far unsuccessful direct searches, notably at LEP [12]. In some regions of the parameter space of the NMSSM, CP-odd Higgs bosons can also be lighter than in the MSSM [13,14]. If they are light enough, any of the NMSSM-specific additional Higgs and neutralino states can have an important impact on sparticle decays, both as potential final states and/or as virtual intermediate states in 3-body decays.…”

Section: Introductionmentioning

confidence: 99%

NMSDECAY: A Fortran code for supersymmetric particle decays in the Next-to-Minimal Supersymmetric Standard Model

Das

Ellwanger

Teixeira

2012

Computer Physics Communications

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The code NMSDECAY allows to compute widths and branching ratios of sparticle decays in the Next-to-Minimal Supersymmetric Standard Model. It is based on a generalization of SDECAY, to include the extended Higgs and neutralino sectors of the NMSSM. Slepton 3-body decays, possibly relevant in the case of a singlino-like lightest supersymmetric particle, have been added. NMSDECAY will be part of the NMSSMTools package, which computes Higgs, sparticle masses and Higgs decays in the NMSSM.

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“…However, the lighter of the two CP odd states (denoted by A 1 ) could have a mass M A 1 below half of the mass M H of H [7,8]. Then, H would decay dominantly as H → A 1 A 1 , since this coupling is typically larger than the coupling of H to b quarks [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Our subsequent results depend only on M A 1 and X d , and are valid for any such models. In the NMSSM, a light CP odd scalar A 1 can play the role of a pseudo Goldstone boson of an approximate R-or Peccei-Quinn symmetry [7,8]. Then, however, one always has cos θ A ∼ 1/ tan β [4] and hence X d < ∼ 1.…”

Section: Introductionmentioning

confidence: 99%

Reduced branching ratio for H → AA → 4 τ from A − η b mixing

Domingo

Ellwanger

2011

J. High Energ. Phys.

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Models with an extended Higgs sector, as the NMSSM, allow for scenarios where the Standard Model-like CP-even Higgs boson H decays dominantly as H → AA → 4 τ where A is a light CP-odd Higgs boson. Tight constraints on this scenario in the form of lower bounds on M H have recently been published by the ALEPH group. We show that, due to A − η b mixing, the branching ratio H → AA → 4 τ is strongly reduced for M A in the range 9 − 10.5 GeV. This is the range of M A in which the tension between the observed η b (1S) mass and its prediction based on QCD can be resolved due to mixing, and which is thus still consistent with a light CP-even Higgs boson H satisfying LEP constraints with a mass well below 114 GeV. This result is practically independent from the coupling of A to b quarks.

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Light axion within the next-to-minimal supersymmetric standard model

Cited by 165 publications

References 37 publications

Supersymmetry with light stops

Supersymmetry with light stops

NMSDECAY: A Fortran code for supersymmetric particle decays in the Next-to-Minimal Supersymmetric Standard Model

Reduced branching ratio for H → AA → 4 τ from A − η b mixing

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