Electroweak phase transitions in the secluded U(1)′-extended MSSM

Chiang, Cheng‐Wei; Senaha, Eibun

doi:10.1007/jhep06(2010)030

Cited by 28 publications

(16 citation statements)

References 70 publications

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“…Model parameters are taken as them shown in Eq. (17). The Xt dependence of these mass spectrum is negligible.…”

Section: Figmentioning

confidence: 89%

“…If this is the case, the mass constraints on the lightest Higgs boson and the light stop would be alleviated significantly. In the singlet-extended MSSM, however, the vacuum structure is inevitably more complicated than the MSSM, giving rise to the unrealistic vacua in the large portion of the parameter space, especially electroweak baryogenesis-motivated scenario [14,17].…”

Section: Introductionmentioning

confidence: 99%

“…′ -extended MSSM [17,18], and so on. In this class of the models, the strong first order EWPT can be induced by the trilinear mixing term of the doublet and the singlet fields appearing in the tree-level Higgs potential.…”

Section: Introductionmentioning

confidence: 99%

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First-order electroweak phase transition powered by additional F-term loop effects in an extended supersymmetric Higgs sector

2011

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We investigate the one-loop effect of new charged scalar bosons on the Higgs potential at finite temperatures in the supersymmetric standard model with four Higgs doublet chiral superfields as well as a pair of charged singlet chiral superfields. In this model, the mass of the lightest Higgs boson h is determined only by the D-term in the Higgs potential at the tree-level, while the triple Higgs boson coupling for hhh can receive a significant radiative correction due to nondecoupling oneloop contributions of the additional charged scalar bosons. We find that the same nondecoupling mechanism can also contribute to realize stronger first order electroweak phase transition than that in the minimal supersymmetric standard model, which is definitely required for a successful scenario of electroweak baryogenesis. Therefore, this model can be a new candidate for a model in which the baryon asymmetry of the Universe is explained at the electroweak scale.

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“…Model parameters are taken as them shown in Eq. (17). The Xt dependence of these mass spectrum is negligible.…”

Section: Figmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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First-order electroweak phase transition powered by additional F-term loop effects in an extended supersymmetric Higgs sector

2011

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“…Besides, the discrete Z 2 symmetry required for stabilizing dark matter candidates can naturally emerge from a local U(1) gauge group [8][9][10][11][12][13][14][15]. An extra U(1) has also been employed in supersymmetric models [16][17][18][19][20] (so-called UMSSM) to facilitate a strong first order electroweak phase transition, as required to realize successful electroweak baryogenesis [21]. Properties of such Z ′ bosons strongly depend on the origin of the corresponding U(1) symmetry in models.…”

Section: Introductionmentioning

confidence: 99%

Phenomenology of E 6-inspired leptophobic Z ′ boson at the LHC

Chiang

Nomura²,

Yagyu³

2014

J. High Energ. Phys.

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Abstract:We study collider phenomenology of a leptophobic Z ′ boson existing in eight scenarios of the E 6 grand unified theory, differing in particle embeddings. We first review the current bound on the Z ′ mass m Z ′ based upon the LHC data of pp → tt process at 8 TeV collisions with an integrated luminosity of 19.6 fb −1 . Most scenarios have a lower bound of about 1 TeV. However, this constraint does not apply to the case where m Z ′ < 2m t , and other methods need to be employed for this lower mass regime. Using existing UA2 constraints and dijet data at the LHC, we find that only one of the eight scenarios is excluded at 95% confidence level. No bound can be obtained from W jj and Zjj measurements. We propose to use the photon associated production of the Z ′ boson that subsequently decays into a pair of bottom quarks, pp → Z ′ γ → bbγ, at the LHC to explore the constraints in the lower mass regime. We compute the expected signal significance as a function of m Z ′ using detailed simulations of signal and irreducible background events. We find constraints for two more scenarios using the 8-TeV data and taking appropriate kinematical cuts. We also show the discovery reach for each scenario at the 14-TeV LHC machine.

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“…[6][7][8][9][10][11][12][13][14], and we will discuss others throughout the remainder of this section. Since our work is most closely related to previous work on SFOPT in the NMSSM, we give here a little preview of some of the differences between our work and select previous works, in addition to the multidimensional aspect stressed above.…”

Section: Introductionmentioning

confidence: 99%

Electroweak phase transition in theμνSSM

Chung

Long

2010

Phys. Rev. D

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An extension of the MSSM called the µνSSM does not allow a conventional thermal leptogenesis scenario because of the low scale seesaw that it utilizes. Hence, we investigate the possibility of electroweak baryogenesis. Specifically, we identify a parameter region for which the electroweak phase transition is sufficiently strongly first order to realize electroweak baryogenesis. In addition to transitions that are similar to those in the NMSSM, we find a novel class of phase transitions in which there is a rotation in the singlet vector space.

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Electroweak phase transitions in the secluded U(1)′-extended MSSM

Cited by 28 publications

References 70 publications

First-order electroweak phase transition powered by additional F-term loop effects in an extended supersymmetric Higgs sector

First-order electroweak phase transition powered by additional F-term loop effects in an extended supersymmetric Higgs sector

Phenomenology of E 6-inspired leptophobic Z ′ boson at the LHC

Electroweak phase transition in theμνSSM

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