scholarly journals Two-Higgs-doublet models with Minimal Flavour Violation

2010 ◽  
Author(s):  
Maria Valentina Carlucci ◽  
Leonardo Angelini ◽  
Pietro Colangelo ◽  
Fulvia De Fazio ◽  
G. E. Bruno ◽  
...  
Keyword(s):  
Higgs Doublet ◽  
Minimal Flavour Violation ◽  
Flavour Violation ◽  
Two Higgs Doublet Models

scholarly journals The framework for a common origin of $$\delta _{\mathrm{CKM}}$$ and $$\delta _{\mathrm{PMNS}}$$

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
Joao M. Alves ◽  
Francisco J. Botella ◽  
Gustavo C. Branco ◽  
Fernando Cornet-Gomez ◽  
Miguel Nebot
Keyword(s):  
Higgs Doublet ◽  
Common Origin ◽  
Tree Level ◽  
Minimal Flavour Violation ◽  
Yukawa Couplings ◽  
Cp Violations ◽  
Flavour Violation ◽  
Two Higgs Doublet Models ◽  
Near Future ◽  
Two Sectors

AbstractWe analyse a possible connection between CP violations in the quark and lepton sectors, parametrised by the CKM and PMNS phases. If one assumes that CP breaking arises from complex Yukawa couplings, both in the quark and lepton sectors, the above connection is not possible in general, since Yukawa couplings in the two sectors have independent flavour structures. We show that both the CKM and PMNS phases can instead be generated by a vacuum phase in a class of two Higgs doublet models, and in this case a connection may be established. This scenario requires the presence of scalar FCNC at tree level, both in the quark and lepton sectors. The appearance of these FCNC is an obstacle and a blessing. An obstacle since one has to analyse which models are able to conform to the strict experimental limits on FCNC, both in the quark and lepton sectors. A blessing, because this class of models is falsifiable since FCNC arise at a level which can be probed experimentally in the near future, specially in the processes $$\mathrm{h}\rightarrow e^\pm \tau ^\mp $$ h → e ± τ ∓ and $$t\rightarrow \mathrm{h}c$$ t → h c . The connection between CP violations in CKM and PMNS is explicitely illustrated in models with Minimal Flavour Violation.

scholarly journals Fingerprinting the contribution of colored scalars to the $$H^+ W^- Z(\gamma )$$ vertex

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Nabarun Chakrabarty ◽  
Indrani Chakraborty ◽  
Dilip Kumar Ghosh
Keyword(s):  
Scalar Potential ◽  
Form Factors ◽  
Higgs Doublet ◽  
New Physics ◽  
Model Parameters ◽  
Minimal Flavour Violation ◽  
Color Octet ◽  
Flavour Violation ◽  
Doublet Model ◽  
Two Higgs Doublet Model

AbstractColor-octet scalars arise in various Grand Unification scenarios and also in other models of new physics. They are also postulated for minimal flavour violation. Purely phenomenological imprints of such scalars are therefore worth looking at. Motivated by this, we perform a complete one-loop calculation of the $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) decay in a two Higgs doublet model augmented by a color-octet $$SU(2)_L$$ S U ( 2 ) L scalar doublet. The computation is conveniently segregated into colorless and colored components. The color-octet part of the amplitude, being scaled by the color-factor, provides an overall enhancement to the form factors. Crucial constraints from perturbative unitarity, positivity of the scalar potential, oblique parameters, Higgs signal strengths and direct search of a charged Higgs and color-octet scalars are folded-in into the analysis. Sensitivity of the loop-induced $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) vertex to other model parameters is elucidated. Finally, the prospect of observing a loop-induced $$H^+ \rightarrow W^+ Z (\gamma )$$ H + → W + Z ( γ ) interaction at the future hadronic collisions is also discussed.

scholarly journals Constraints on coloured scalars from global fits

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Otto Eberhardt ◽  
Víctor Miralles ◽  
Antonio Pich
Keyword(s):  
Top Quark ◽  
Scalar Potential ◽  
Higgs Doublet ◽  
Model Parameters ◽  
Simple Extension ◽  
Minimal Flavour Violation ◽  
Yukawa Couplings ◽  
Flavour Violation ◽  
The One ◽  
Potential Parameters

Abstract We consider a simple extension of the electroweak theory, incorporating one SU(2)L doublet of colour-octet scalars with Yukawa couplings satisfying the principle of minimal flavour violation. Using the HEPfit package, we perform a global fit to the available data, including all relevant theoretical constraints, and extract the current bounds on the model parameters. Coloured scalars with masses below 1.05 TeV are already excluded, provided they are not fermiophobic. The mass splittings among the different (charged and CP-even and CP-odd neutral) scalars are restricted to be smaller than 20 GeV. Moreover, for scalar masses smaller than 1.5 TeV, the Yukawa coupling of the coloured scalar multiplet to the top quark cannot exceed the one of the SM Higgs doublet by more than 80%. These conclusions are quite generic and apply in more general frameworks (without fine tunings). The theoretical requirements of perturbative unitarity and vacuum stability enforce relevant constraints on the quartic scalar potential parameters that are not yet experimentally tested.

scholarly journals Dynamics of Nambu monopole in two Higgs doublet models. Cosmological Monopole Collider

2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
Minoru Eto ◽  
Yu Hamada ◽  
Masafumi Kurachi ◽  
Muneto Nitta
Keyword(s):  
Higgs Doublet ◽  
Two Higgs Doublet Models

scholarly journals Limits on neutrinophilic two-Higgs-doublet models from flavor physics

2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Enrico Bertuzzo ◽  
Yuber F. Perez G. ◽  
Olcyr Sumensari ◽  
Renata Zukanovich Funchal
Keyword(s):  
Flavor Physics ◽  
Higgs Doublet ◽  
Two Higgs Doublet Models

scholarly journals New limits on tanβ for 2HDMs with Z2 symmetry

2015 ◽  
Vol 30 (26) ◽  
pp. 1550158 ◽  
Author(s):  
Dipankar Das
Keyword(s):  
Lower Limit ◽  
Scalar Potential ◽  
Higgs Doublet ◽  
Exact Formula ◽  
Meson Mass ◽  
Neutral Meson ◽  
Breaking Parameter ◽  
Two Higgs Doublet Models ◽  
Breaking Term

In two-Higgs-doublet models with exact [Formula: see text] symmetry, putting [Formula: see text] at the alignment limit, the following limits on the heavy scalar masses are obtained from the conditions of unitarity and stability of the scalar potential: [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. The constraints from [Formula: see text] and neutral meson mass differences, when superimposed on the unitarity constraints, put a tighter lower limit on [Formula: see text] depending on [Formula: see text]. It has also been shown that larger values of [Formula: see text] can be allowed by introducing soft breaking term in the potential at the expense of a correlation between [Formula: see text] and the soft breaking parameter.

scholarly journals Neutral minima in two-Higgs doublet models

2007 ◽  
Vol 652 (4) ◽  
pp. 181-193 ◽  
Author(s):  
A. Barroso ◽  
P.M. Ferreira ◽  
R. Santos
Keyword(s):  
Higgs Doublet ◽  
Two Higgs Doublet Models
Sign in / Sign up

Export Citation Format

Share Document