scholarly journals The bilinear formalism and the custodial symmetry in the two-Higgs-doublet model

2011 ◽  
Vol 2011 (11) ◽  
Author(s):  
B. Grzadkowski ◽  
M. Maniatis ◽  
José Wudka
Keyword(s):  
Higgs Doublet ◽  
Bilinear Formalism ◽  
Custodial Symmetry ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals Multiple point principle in the general Two-Higgs-Doublet model

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Markos Maniatis ◽  
Lohan Sartore ◽  
Ingo Schienbein
Keyword(s):  
Higgs Boson ◽  
Higgs Doublet ◽  
Boson Mass ◽  
Multiple Point ◽  
Higgs Boson Mass ◽  
Bilinear Formalism ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Abstract Based on the Multiple Point Principle, the Higgs boson mass has been predicted to be 135 ± 9 GeV — more than two decades ago. We study the Multiple Point Principle and its prospects with respect to the Two-Higgs-Doublet model (THDM). Applying the bilinear formalism we show that concise conditions can be given with a classification of different kinds of realizations of this principle. We recover cases discussed in the literature but identify also different realizations of the Multiple Point Principle.

scholarly journals New scenario for aligned Higgs couplings originated from the twisted custodial symmetry at high energies

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Masashi Aiko ◽  
Shinya Kanemura
Keyword(s):  
Experimental Data ◽  
Higgs Boson ◽  
Higgs Doublet ◽  
Higgs Bosons ◽  
Coupling Constants ◽  
Global Symmetry ◽  
Fundamental Theory ◽  
Custodial Symmetry ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Abstract We investigate a new scenario of the two Higgs doublet model, where the current experimental data for the electroweak rho parameter and those for the Higgs boson couplings can be simultaneously explained. In this scenario, the two Higgs doublet model is supposed to be a low energy effective theory up to a high energy scale Λ, above which a fundamental theory should appear. It is assumed that the Higgs potential respects a global symmetry at Λ (the twisted custodial symmetry), which is to be given as a consequence of the global symmetry structure of the fundamental theory above Λ. By the analysis using one-loop renormalization group equations, the above experimental data can be explained in a natural way even when the masses of the extra Higgs bosons are near the electroweak scale. We also discuss the predictions on the mass spectrum of the additional Higgs bosons and also those on the coupling constants of the standard-model-like Higgs boson, which make it possible to test this scenario at the current and future collider experiments.

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

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.

scholarly journals Signals of new gauge bosons in gauged two higgs doublet model

2018 ◽  
Vol 78 (8) ◽  
Author(s):  
Wei-Chih Huang ◽  
Hiroyuki Ishida ◽  
Chih-Ting Lu ◽  
Yue-Lin Sming Tsai ◽  
Tzu-Chiang Yuan
Keyword(s):  
Higgs Doublet ◽  
Gauge Bosons ◽  
Doublet Model ◽  
Two Higgs Doublet Model

scholarly journals THE EFFECTS OF NON-UNIVERSAL EXTRA DIMENSIONS ON THE $\tau\rightarrow\mu\bar\nu_i\nu_i$ DECAY

2005 ◽  
Vol 20 (24) ◽  
pp. 1845-1857 ◽  
Author(s):  
E. O. ILTAN
Keyword(s):  
Extra Dimension ◽  
Extra Dimensions ◽  
Branching Ratio ◽  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model

We study [Formula: see text], i = e, μ, τ decays in the two-Higgs doublet model, with the inclusion of one and two spatial non-universal extra dimensions. We observe that the branching ratio is sensitive to two extra dimensions in contrary to a single extra dimension.

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