Non-decoupling effects in supersymmetric Higgs sectors

Kanemura, Shinya; Shindou, Tetsuo; Yagyu, Kei

doi:10.1016/j.physletb.2011.04.001

Cited by 10 publications

(20 citation statements)

References 64 publications

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“…For the soft SUSY breaking masses, we consider three benchmark sets of parameters shown in Table 3. When the contribution coming from the Higgs VEV dominates the mass, significant non-decoupling effects can arise [4,5]. Since we are interested in such non-decoupling cases, some soft SUSY breaking parameters are taken to be as light as 50 GeV.…”

Section: So Far We Have Shown Thatmentioning

confidence: 99%

“…This Z 2 parity can supply a new candidate for dark matter, in addition to the R-parity. In our model, unlike the minimal SUSY fat Higgs model, [5], and can make the first order EWPT strong enough through the large F-term coupling constants [7].…”

Section: Introductionmentioning

confidence: 99%

“…First, radiative corrections involving the strongly coupled new fields can raise the SM-like Higgs boson mass to 125 GeV with rather natural choice of the stop masses and mixing. Second, the strongly coupled fields significantly contribute to the triple SM-like Higgs boson coupling through loop effects, so that it deviates by a few tens percent from the SM prediction [4,5]. A similar non-decoupling effect tends to enhance the first order electroweak phase transition [6,7].In the MSSM, it is not easy to make the first order electroweak phase transition (EWPT) strong enough to satisfy the sphaleron decoupling condition [8], which is required by the successful electroweak baryogenesis [9,10].…”

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confidence: 99%

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Light Higgs scenario based on the TeV-scale supersymmetric strong dynamics

2012

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We consider a model based on the supersymmetric QCD theory with N c = 2 and N f = 3. The theory is strongly coupled at the infrared scale Λ H . Its low energy effective theory below Λ H is described by the supersymmetric standard model with the Higgs sector that contains four iso-spin doublets, two neutral iso-spin singlets and two charged iso-spin singlets. If Λ H is at the multi-TeV to 10 TeV, coupling constants for the F-terms of these composite fields are relatively large at the electroweak scale. Nevertheless, the SM-like Higgs boson is predicted to be as light as 125 GeV because these F-terms contribute to the mass of the SM-like Higgs boson not at the tree level but at the one-loop level. A large non-decoupling effect due to these F-terms appears in the one-loop correction to the triple Higgs boson coupling, which amounts to a few tens percent. Such a non-decoupling property in the Higgs potential realizes the strong first order phase transition, which is required for a successful scenario of electroweak baryogenesis.Recently, the ATLAS and CMS experiments at the LHC [1] have reported an excess in the gamma-gamma mode at about 125 GeV, which may be a signal of the Higgs boson. In the Standard Model (SM), a light Higgs boson is the evidence of the weakly coupled Higgs sector. In models for physics beyond the SM, however, the light Higgs boson does not always correspond to a weakly coupled theory. The scenario based on little Higgs models [2] is an example of a strongly coupled theory with a light Higgs boson, where the Higgs boson arises as a pseudo Nambu-Goldstone boson originating from the breaking of some strongly interacting global symmetry at the TeV scale, and the Higgs boson mass is kept to be light. Supersymmetry (SUSY) is one of the most attractive candidates for the physics beyond the SM. SUSY can solve the gauge hierarchy problem, as the quadratic divergence in the radiative correction to the Higgs boson mass is cancelled owing to the non-renormalization theorem.In addition, elementary scalar fields are automatically introduced in the SUSY theory. The Higgs sector of the minimal SUSY extension of the SM (MSSM) necessarily contains two Higgs doublets. In the MSSM, the coupling constants in the Higgs potential are determined by the electroweak gauge couplings, and the mass of the SM-like Higgs boson is less than the Z boson mass at the tree level. With significant radiative corrections due to the large top Yukawa coupling [3], the Higgs mass can be pushed up to around 125 GeV in the case of very large stop masses or very large left-right stop mixing.Even within the framework based on SUSY, models with strongly coupled light Higgs boson can be constructed. A possible way is to introduce additional R-parity-even chiral superfields which strongly couple to the Higgs sector but the F-terms of which do not contribute to the Higgs boson four-point coupling. In this case, the SM-like Higgs boson is kept to be light. The strong couplings have rich phenomenological implications. First, radiative corrections...

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Section: So Far We Have Shown Thatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Light Higgs scenario based on the TeV-scale supersymmetric strong dynamics

2012

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“…Therefore, the measurement of the hhh coupling constant at collider experiments can be an important probe into such a cosmological scenario. The oneloop contributions to the hhh coupling constant can also be very large in the model with sequential fourth generation fermions [14] and a class of extended supersymmetric SMs [15].…”

Section: Introductionmentioning

confidence: 99%

Higgs boson pair production in new physics models at hadron, lepton, and photon colliders

Asakawa¹,

Harada²,

Kanemura³

et al. 2010

Phys. Rev. D

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We study Higgs boson pair production processes at future hadron and lepton colliders including the photon collision option in several new physics models; i.e., the two-Higgs-doublet model, the scalar leptoquark model, the sequential fourth generation fermion model and the vectorlike quark model. Cross sections for these processes can deviate significantly from the standard model predictions due to the oneloop correction to the triple Higgs boson coupling constant. For the one-loop induced processes such as gg ! hh and ! hh, where h is the (lightest) Higgs boson and g and respectively represent a gluon and a photon, the cross sections can also be affected by new physics particles via additional one-loop diagrams. In the two-Higgs-doublet model and scalar leptoquark models, cross sections of e þ e À ! hhZ and ! hh can be enhanced due to the nondecoupling effect in the one-loop corrections to the triple Higgs boson coupling constant. In the sequential fourth generation fermion model, the cross section for gg ! hh becomes very large because of the loop effect of the fermions. In the vectorlike quark model, effects are small because the theory has decoupling property. Measurements of the Higgs boson pair production processes can be useful to explore new physics through the determination of the Higgs potential.

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“…The deviation can be drastically large because of the large coupling λ between Z 2 -odd superfields and MSSM Higgs superfields [23].…”

Section: Triple Higgs Boson Couplingmentioning

confidence: 99%

Electroweak phase transition and Higgs boson couplings in the model based on supersymmetric strong dynamics

Kanemura

Senaha²,

Shindou

et al. 2013

J. High Energ. Phys.

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Abstract:We discuss a strongly-coupled extended Higgs sector with the 126 GeV Higgs boson, which is a low-energy effective theory of the supersymmetric SU(2) H gauge thoery that causes confinement. In this effective theory, we study the parameter region where electroweak phase transition is of strongly first order, as required for successful electroweak baryogenesis. In such a parameter region, the model has a Landau pole at the order of 10 TeV, which corresponds to the confinement scale of the SU(2) H gauge theory. We find that the large coupling constant which blows up at the Landau pole results in large non-decoupling loop effects on low-energy observables, such as the Higgs-photon-photon vertex and the triple Higgs boson vertex. As phenomenological consequences of electroweak baryogenesis in our model, the Higgs-to-diphoton branching ratio is about 20% smaller while the triple Higgs boson coupling is more than about 20% larger than the standard model predictions. Such deviations may be detectable in future collider experiments.

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Non-decoupling effects in supersymmetric Higgs sectors

Cited by 10 publications

References 64 publications

Light Higgs scenario based on the TeV-scale supersymmetric strong dynamics

Light Higgs scenario based on the TeV-scale supersymmetric strong dynamics

Higgs boson pair production in new physics models at hadron, lepton, and photon colliders

Electroweak phase transition and Higgs boson couplings in the model based on supersymmetric strong dynamics

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