Stability and symmetry breaking in a three-Higgs-doublet model with lepton family symmetryO(2)⊗Z2

Abstract We study CP-Violation (CPV) in a Composite 2-Higgs Doublet Model (C2HDM) based on the global symmetry breaking SO(6)/[SO(4) × SO(2)], wherein the strong sector is modeled by a two-site moose structure. Non-trivial complex phases in the interactions involving fermions in both the elementary and strong sectors can induce CPV in the Higgs potential as well as the Yukawa coupling parameters. We compute both of the latter and analyse their dependence upon the aforementioned complex phases. Finally, we discuss physics observables which are distinctive of this model. Even in the simplest case with only one complex phase in the strong sector we can get significant CPV effects.

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MASS TERMS IN CP-CONSERVING WEINBERG THREE-HIGGS-DOUBLET MODEL

International Journal of Modern Physics E ◽

10.1142/s021830130901383x ◽

2009 ◽

Vol 18 (08) ◽

pp. 1781-1784 ◽

Cited By ~ 1

Author(s):

S. ZARRINKAMAR ◽

H. HASSANABADI ◽

A. A. RAJABI

Keyword(s):

Symmetry Breaking ◽

Spontaneous Symmetry Breaking ◽

Higgs Doublet ◽

Higgs Mechanism ◽

The Real ◽

Doublet Model ◽

Mass Terms ◽

Higgs Fields

By applying two transformations on the vacuum expectations of the Higgs fields, we show that instead of considering three nonvanishing complex fields, one can easily work with the real parts of two fields while CP conservation is assumed. Using this result, we next obtain the mass terms of CP-conserving Weinberg three-Higgs-doublet model (3HDM) which are essential in study of the spontaneous symmetry breaking and the Higgs mechanism.

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Interplay of New Physics effects in (g − 2)ℓ and h → ℓ+ℓ− — lessons from SMEFT

Journal of High Energy Physics ◽

10.1007/jhep06(2021)099 ◽

2021 ◽

Vol 2021 (6) ◽

Author(s):

Svjetlana Fajfer ◽

Jernej F. Kamenik ◽

M. Tammaro

Keyword(s):

Closed Operator ◽

Higgs Doublet ◽

New Physics ◽

Effective Field ◽

Tree Level ◽

Electroweak Symmetry ◽

Scalar Leptoquark ◽

Doublet Model ◽

The One ◽

Two Higgs Doublet Model

Abstract We explore the interplay of New Physics (NP) effects in (g− 2)ℓ and h→ℓ+ℓ− within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and SU(2)L gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the (g−2)ℓ and h→ℓ+ℓ− contributions obtained by the complete one- and even two-loop calculations in the full models.

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