Fitting the $$ Zb\overline{b} $$ vertex in the two-Higgs-doublet model and in the three-Higgs-doublet model

Jurčiukonis, Darius; Lavoura, L.

doi:10.1007/jhep07(2021)195

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…[1,2] through computations of a simple and precise algorithm [3]. The aligned three Higgs doublet model (A3HDM) has a quite large number of free parameters in the quartic scalar potential, but due to additional constraints, the BFB conditions for the model can be expressed analytically [4,5], while the CP-conserved left-right model (LRM) requires a quite complicated algorithm for the estimation of BFB conditions [6,7].…”

Section: Details Of the Computationsmentioning

confidence: 99%

Machine Learning for Prediction of Unitarity and Bounded from Below Constraints

Jurciukonis

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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Machine learning (ML) techniques to predict unitarity (UNI) and bounded from below (BFB) constraints in multi-scalar models are employed. The effectiveness of this approach is demonstrated by applying it to the two and three Higgs doublet models, as well as the left-right model. By employing suitable neural network architectures, learning algorithms, and carefully curated training datasets, a significantly high level of predictivity is achieved. Machine learning offers a distinct advantage by enabling faster calculations compared to alternative numerical methods, such as scalar potential minimization. This research investigates the feasibility of utilizing ML techniques as an alternative for predicting these constraints, offering potential improvements over traditional numerical calculations.

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Section: Details Of the Computationsmentioning

confidence: 99%

Machine Learning for Prediction of Unitarity and Bounded from Below Constraints

Jurciukonis

2024

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2023)

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“…A detailed review of the 2HDM is presented in [6], and an increasing number of works are now focussing on various aspects of 3HDMs (both theoretical and phenomenological) e.g. see [26,27], with recent studies in [28][29][30][31][32][33][34][35][36][37][38].…”

Section: Parameter Space For a Large Br(h ± → Cb) In 2hdms And 3hdmsmentioning

confidence: 99%

“…However, more important to this work are the constraints on the plane [X, Y] from t → H ± b (for which |Z| also has an influence due its effect on the BRs of H ± ), as shown in [20,22] and in section 4. A recent study of the contribution of the scalars (both neutral and charged) in a 3HDM to Z → bb has been carried out in [30].…”

Section: Constraints On the Couplings X Y And Zmentioning

confidence: 99%

Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider

Akeroyd

Moretti

Song

2022

J. Phys. G: Nucl. Part. Phys.

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Searches for a charged Higgs boson ($H^\pm$) decaying to a charm quark and a bottom quark ($H^\pm \to cb$) have been carried out at the Large Hadron Collider (LHC) in the decay of top quarks ($t\to H^\pm b$). In a recent search by the ATLAS collaboration (with all Run II data, 139 fb$^{-1}$) a local excess of around $3\sigma$ has been observed, which is best fitted by a charged Higgs boson with a mass ($m_{H^\pm}$) of around 130 GeV and a product of branching ratios (BRs) given by BR$(t\to H^\pm b)\times{\rm BR}(H^\pm\to cb)=0.16\%\pm 0.06\%$. In the context of Two-Higgs-Doublet Models (2HDM) with independent Yukawa couplings for $H^\pm$ we present the parameter space for which this excess (assuming it to be genuine) can be accommodated, taking into account the limits from LHC searches for $H^\pm\to cs$ and $H^\pm\to \tau\nu$ at $m_{H^\pm}$=130 GeV and the constraint from $b\to s\gamma$. It is then shown that such an excess cannot be explained in 2HDMs with natural flavour conservation, but can be accommodated in the flipped Three-Higgs-Doublet Model (3HDM) and in the aligned 2HDM (A2HDM). Upcoming searches with 139 fb$^{-1}$ in the channels $H^\pm\to cb$ (CMS), $H^\pm \to cs$ (ATLAS/CMS) and $H^\pm \to \tau\nu$ (ATLAS/CMS) will determine if the excess is the first sign of an $H^\pm$ with $m_{H^\pm}=130$ GeV.

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“…The expressions of the oblique parameters S and U for BSM models with extra non-standard multiplets, larger than SU (2) L doublets, are prescribed in [13]. For aligned 2HDM and 3HDM , oblique parameters are given in [15]. Expressions of some of the oblique parameters in complex singlet scalar extended SM [16][17][18][19], Two Higgs Doublet Model [8, 20-29, 29, 30], Three Higgs Doublet Model [31][32][33],…”

Section: Introductionmentioning

confidence: 99%

Oblique parameters of BSM models with three CP-even neutral scalars

Ghosh¹

2022

Preprint

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We express the oblique parameters S, T , U , V , W , and X in terms of the corresponding mixing matrices in the framework of three BSM models with three CP-even neutral scalars. We consider three types of the extension of the scalar sector of the SM with non-standard (i) two real singlet scalars, (ii) one complex doublet and one real singlet scalar, and (iii) two complex doublets. We present the expressions such that one can use these when all the neutral CP-even scalars have VEV, or one of them does not have any VEV. The principal benifit of presenting the oblique parameters in this way is, the sole knowledge of the mixing matrices in the corresponding scalar sector is enough to extract the expression of the oblique parameter of that particular BSM model.

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Fitting the $$ Zb\overline{b} $$ vertex in the two-Higgs-doublet model and in the three-Higgs-doublet model

Cited by 4 publications

References 32 publications

Machine Learning for Prediction of Unitarity and Bounded from Below Constraints

Machine Learning for Prediction of Unitarity and Bounded from Below Constraints

Slight excess at 130 GeV in search for a charged Higgs boson decaying to a charm quark and a bottom quark at the Large Hadron Collider

Oblique parameters of BSM models with three CP-even neutral scalars

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