Charge asymmetry in two-Higgs doublet models

Lahanas, A.B.; Spanos, Vassilis C.; Zarikas, Vasilios

doi:10.1016/s0370-2693(99)01400-8

Cited by 22 publications

(19 citation statements)

References 40 publications

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“…Two Higgs doublet models(2HDM) are simple extensions of the SM in which the scalar sector of the SM is enlarged to contain new scalars [57][58][59][60][61][62]. Based on the couplings of the new scalars to quarks and leptons we can classify these models to several types such as type I, II or III [63].…”

Section: Cp Asymmetry Ofmentioning

confidence: 99%

Exploring new physics contributions to CP violation in $$\tau ^- \rightarrow K^-\pi ^0\nu _{\tau } $$

2021

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A general analysis of possible violation of CP in processes like $$\tau \rightarrow K\pi \nu $$ τ → K π ν , for unpolarized $$\tau $$ τ is presented. In this paper, we derive the new contributions to the effective Hamiltonian governs $$\vert \Delta S \vert =1$$ | Δ S | = 1 semileptonic tau decays in the framework of two Higgs doublet model with generic Yukawa structure and Leptoquarks models. Within these models, we list all operators, in the effective Hamiltonian and provide analytical expression for their corresponding Wilson coefficients. Moreover, we analyze the role of the different contributions, originating from the scalar, vecor and tensor hadronic currents, in generating direct CP asymmetry in the decay rate of $$\tau ^-\rightarrow K^-\pi ^0\nu _\tau $$ τ - → K - π 0 ν τ . We show that non vanishing direct CP asymmetry in the decay rate of $$\tau ^-\rightarrow K^-\pi ^0\nu _\tau $$ τ - → K - π 0 ν τ can be generated due to the presence of both, the weak phase in the Wilson coefficient corresponding to the tensor operator and the strong phase difference resulting from the interference between the form factors expressing the matrix elements of the vector and tensor hadronic currents. After taking into account all relevant constraints, we find that the generated direct CP asymmetry is of order $$10^{-8}$$ 10 - 8 which is several orders of magnitude larger than the standard model prediction. We show also that, in two Higgs doublet model with generic Yukawa structure , direct local or non integrated CP violation can be as large as 0.3 % not far from experimental possibilities. This kind of asymmetry can be generated due to the interference between vector and scalar contributions with different weak phases which is not the case in the SM.

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Section: Cp Asymmetry Ofmentioning

confidence: 99%

Exploring new physics contributions to CP violation in $$\tau ^- \rightarrow K^-\pi ^0\nu _{\tau } $$

2021

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“…The latter phase is not realized in the Universe at zero temperatures as it follows from the severe bounds on both electric charge asymmetry and on the photon mass (see, e.g. [31]).…”

Section: Effective Potential and Mass Spectrum Of Composite Higgs Bosonsmentioning

confidence: 99%

Composite two-Higgs models and chiral symmetry restoration

Andrianov

Rodenberg

1999

J. High Energy Phys.

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The effective quark models with quasilocal interaction are used for description of two composite Higgs doublets, in strong coupling (tricritical) regime below the compositeness scale Λ C . The low energy effective action of Two-Higgs Doublet Standard Model (2HD SM) is obtained in the large N c and large-log approximation. The two-point correlators of scalar and pseudoscalar Higgs fields are derived for investigation of how the chiral symmetry is broken. The comparison of their asymptotics at high energies allows to realize the chiral symmetry restoration characteristic for the QCD-like models and thereby to make hints on the existence of new physical phenomena in the TeV energy region.

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“…As the experimental discovery [7,8] places Higgs as the only fundamental scalar field in the standard model, it presents an opportunity to explore interactions among scalar fields using experimentally known results. There have also been several studies of Higgs interactions from other perspectives, see for example [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Exploring Higgs boson Yukawa interactions with a scalar singlet using Dyson-Schwinger equations

Mufti¹

2018

Preprint

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Higgs, being the first discovery of a fundamental scalar field in the standard model (SM), opens the possibility of existence of other scalar or pseudo scalar particles in nature. Though it does not conclusively fulfill the role of inflaton, it does provide motivation for experimental searches involving interactions of scalar (or pseudo scalar) particles as well as implications of such particles' existence from the perspective of theoretical understanding. Yukawa interactions are among the possible interactions. The considered model addresses Yukawa interaction among the Higgs (and Higgs bar) 1 and a real singlet scalar field using Dyson Schwinger equations (DSEs) over a range of bare coupling values relevant to inflation-related physics for several scalar bare masses and cutoff values. The Higgs mass is kept fixed at two values for two different scenarios. It is found that Higgs propagators are tree level dominated while scalar propagators, despite their dependence on parameter region, do not degenerate over the whole parameter space. The interaction vertices show significant deviations from tree level expression for a number of parameters and exhibit two distinct behaviors. Furthermore, the theory does not show any conclusive sign of triviality over the explored parameter space, despite suppressed vertices for some parameters, particularly for small coupling values in a certain region of parameter space.

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Charge asymmetry in two-Higgs doublet models

Cited by 22 publications

References 40 publications

Exploring new physics contributions to CP violation in $$\tau ^- \rightarrow K^-\pi ^0\nu _{\tau } $$

Exploring new physics contributions to CP violation in $$\tau ^- \rightarrow K^-\pi ^0\nu _{\tau } $$

Composite two-Higgs models and chiral symmetry restoration

Exploring Higgs boson Yukawa interactions with a scalar singlet using Dyson-Schwinger equations

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