Top-bottom-tau Yukawa coupling unification in the MSSM plus one vectorlike family and fermion masses as IR fixed points

Dermíšek, Radovan; McGinnis, Navin

doi:10.1103/physrevd.99.035033

Cited by 19 publications

(15 citation statements)

References 89 publications

(117 reference statements)

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“…conditions [14] and these results remain a good approximation as long as the boundary conditions are comparable. Lepton Yukawa couplings (τ and those of vectorlike fields) are driven to the trivial fixed point by large quark Yukawa couplings (and thus indirectly by α 3 ).…”

Section: Model and Details Of The Analysismentioning

confidence: 56%

“…The RG equations for gauge and Yukawa couplings in this model and related discussion can be found in Refs. [6,14], where predictions for the scale of new physics from gauge coupling unification and the possibility of Yukawa coupling unification in this model were studied.…”

Section: Model and Details Of The Analysismentioning

confidence: 99%

“…Alternatively, the structure of the renormalization group (RG) equations of a given model may lead to a certain pattern in model parameters far below the fundamental scale that depends very little on boundary conditions. Indeed, there have been many attempts to understand values of some gauge couplings [1][2][3][4][5][6] or Yukawa couplings [7][8][9][10][11][12][13][14] from the IR fixed point structure of RG equations. This is quite an intriguing possibility that allows for predictions of SM parameters even if the fundamental symmetries or model parameters at the fundamental scale remain obscure.…”

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confidence: 99%

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Seven Largest Couplings of the Standard Model as IR Fixed Points

Dermíšek¹,

McGinnis²

2019

Phys. Rev. Lett.

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Section: Model and Details Of The Analysismentioning

confidence: 56%

Section: Model and Details Of The Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Seven Largest Couplings of the Standard Model as IR Fixed Points

Dermíšek¹,

McGinnis²

2019

Phys. Rev. Lett.

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“…Extensions of the SM, two Higgs doublet models or the minimal supersymmetric model (MSSM) with vectorlike matter were previously explored in a variety of contexts. Examples include studies of their effects on gauge and Yukawa couplings in the framework of grand unification [15][16][17][18][19][20][21][22][23] and on electroweak symmetry breaking and the Higgs boson mass [24][25][26]. The supersymmetric extension with a complete vectorlike family provides a very sharp prediction for the weak mixing angle [22,27] and also a possibility to understand the values of all large couplings in the SM from the IR fixed point structure of the renormalization group equations [28].…”

Section: Jhep04(2019)019mentioning

confidence: 99%

Hunting for vectorlike quarks

Dermíšek

Lunghi

Shin

2019

J. High Energ. Phys.

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We analyze decays of vectorlike quarks in extensions of the standard model and a two Higgs doublet model. We identify several typical patterns of branching ratios of the lightest new up-type quark, t 4 , and down-type quark, b 4 , depending on the structure of Yukawa couplings that mix the vectorlike and standard model quarks (we assume only mixing with the third generation) and also on their doublet or singlet nature. We find that decays into heavy neutral or charged Higgs bosons, when kinematically open, can easily dominate and even be close to 100%: b 4 → Hb at medium to large tan β, t 4 → Ht at small tan β and b 4 → H ± t, t 4 → H ± b at both large and small tan β. The pair production of vectorlike quarks leads to 6t, 4t2b, 2t4b and 6b final states. The decay modes into W , Z and h follow the pattern expected from the Goldstone boson equivalence limit that we generalize to scenarios with all possible couplings. We also discuss in detail the structure of Yukawa couplings required to significantly deviate from the pattern characteristic of the Goldstone boson equivalence limit that can result in essentially arbitrary branching ratios.

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“…They are also considered for a variety of theoretical reasons. Examples include studies of their effects on gauge and Yukawa couplings in the framework of grand unification [15][16][17][18][19][20][21][22][23], on electroweak symmetry breaking [24], and the Higgs boson mass and its decays [14,[25][26][27]. The supersymmetric extension with a complete vectorlike family also provides a possibility to understand the values of all large couplings in the SM from the IR fixed point structure of the renormalization group equations [28].…”

mentioning

confidence: 99%

Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models

Dermíšek

Lunghi

Shin

2020

J. High Energ. Phys.

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We study cascade decays of heavy neutral Higgs bosons through vectorlike quarks. We focus on scenarios where decay modes into pairs of vectorlike quarks are not kinematically open which extends the sensitivity of the LHC to larger masses. Assuming only mixing with the third family of standard model quarks the new decay modes of heavy Higgs bosons are: H → t 4 t → W bt, Ztt, htt and H → b 4 b → W tb, Zbb, hbb, where t 4 (b 4 ) is the new up-type (down-type) quark mass eigenstate. We identify the region of the parameter space where these decay modes are significant or can even dominate. We also find that the rates for these processes can be much larger than the rates for a single production of vectorlike quarks. Thus, in the identified regions, they provide the best opportunities for the discovery of a new Higgs boson and vectorlike quarks. In the numerical analysis we assume the CP even Higgs boson in the two Higgs doublet model type-II but the signatures are relevant for many other scenarios.Among the simplest extensions of the standard model (SM) are models with extra Higgs bosons or vectorlike matter. Many searches for such individual new particles have been performed. However, if both sectors are present, new search strategies can be designed that could lead to a simultaneous discovery of heavy Higgs bosons and matter particles. These can be even more potent than separate searches. In this paper we focus on cascade decays of a heavy neutral Higgs boson through vectorlike quarks.We consider an extension of the two Higgs doublet model type-II by vectorlike pairs of new quarks (VLQ), corresponding to a copy of the SM SU(2) doublet and singlet quarks and their vectorlike partners, introduced in ref. [1]. Assuming only the mixing with the third family of standard model quarks, the flavor changing couplings of W , Z and Higgs bosons between new quarks and the third family quarks are generated. These couplings allow new decay modes of the heavy CP even (or CP odd) Higgs boson: H → t 4 t and H → b 4 b, where t 4 and b 4 are the lightest new up-type and down-type quark mass eigenstates. Although these decay modes compete with H → tt and H → bb we will see that, in a region of the parameter space, they are significant or can even dominate. Here we assume that the light Higgs boson (h) is SM-like so that H → ZZ, W W are not present. Subsequent decay modes of t 4 and b 4 : t 4 → W b, t 4 → Zt, t 4 → ht and b 4 → W t, b 4 → Zb, b 4 → hb lead to the following 6 decay chains of the heavy Higgs boson: H → t 4 t → W bt, Ztt, htt, (1.1) H → b 4 b → W tb, Zbb, hbb, (1.2)which are also depicted in figure 1.

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Top-bottom-tau Yukawa coupling unification in the MSSM plus one vectorlike family and fermion masses as IR fixed points

Cited by 19 publications

References 89 publications

Seven Largest Couplings of the Standard Model as IR Fixed Points

Seven Largest Couplings of the Standard Model as IR Fixed Points

Hunting for vectorlike quarks

Cascade decays of heavy Higgs bosons through vectorlike quarks in two Higgs doublet models

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