Impact of Yukawa-like dimension-five operators on the Georgi-Machacek model

Banerjee, Avik; Bhattacharyya, Gautam; Kumar, Nilanjana

doi:10.1103/physrevd.99.035028

Cited by 18 publications

(15 citation statements)

References 60 publications

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“…For tan β = 8, σ pp→t H + →tW + γ measures up to 29 fb ( 1017 fb) at 14 TeV (100 TeV) pp-collisions. One must note that the aforementioned cross sections are much smaller than what would have been in case of the Georgi-Machacek (GM) model [97][98][99][100][101][102][103][104][105][106][107][108][109], or, scalar-triplet extensions of the MSSM [110][111][112] that predict F Z ∼ O(0.1) at the tree level itself. 12 However, Machine Learning techniques can be invoked to perform state-of-the-art event analyses and possibly distinguish the present scenario from the GM model by probing the momentum dependence of production amplitude discussed above.…”

Section: Cross Sections At Pp Collidersmentioning

confidence: 99%

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

2020

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Color-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.

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Section: Cross Sections At Pp Collidersmentioning

confidence: 99%

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

2020

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“…(40). Our notation differs considerably from the notation used by earlier authors [10,18,19]. The motivation for the change of notation was explained in the text: our use of two different kinds of quartic couplings, with two different letters, helps understand the symmetries of the mass matrices.…”

Section: A Su(2) Invariants In Spherical Basismentioning

confidence: 99%

Custodial symmetry, Georgi-Machacek model, and other scalar extensions

Kundu,

Mondal,

Pal

2021

Preprint

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Even after spontaneous symmetry breaking, the Standard Model (SM) possesses an unbroken global SU(2) symmetry in the scalar sector that dictates a mass relation between the W and the Z. Several extensions of the SM also have a similar symmetry. In this paper, we critically examine the notion of CS and show that there may be three different classes of CS, depending on the gauge couplings and self-couplings of the scalars. Among old models that preserve CS, we discuss the Two-Higgs Doublet Model and the one doublet plus two triplet model by Georgi and Machacek. We show that for two-triplet extensions, the Georgi-Machacek model is not the most general possibility with CS. Rather, we find, as the most general extension, a new model with more parameters and hence a richer phenomenology. Some of the consequences of this new model have also been discussed.

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“…These involve combining a real scalar triplets with a complex ones in a custodially symmetric manner such that the ρ-parameter is unity for all values of the triplet VEV. The most popular of such extensions arguably is the Georgi-Machacek (GM) model (see [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] for a partial list of references) that features an SU (2) L × SU (2) R global symmetry in the scalar potential. This framework predicts two charged Higgses both of which couple to W + , Z .…”

Section: Introductionmentioning

confidence: 99%

Probing the $$H^\pm W^{\mp } Z$$ interaction at the high energy upgrade of the LHC

et al. 2021

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An $$H^\pm W^{\mp } Z$$ H ± W ∓ Z interaction at the tree level is a common feature of new physics models that feature scalar triplets. In this study, we aim to probe the strength of the aforementioned interaction in a model-agnostic fashion at the futuristic 27 TeV proton-proton collider. We assume that the $$H^\pm $$ H ± couples dominantly to ($$W^\pm ,Z$$ W ± , Z ) and (t, b) and specifically study the processes that involve the $$H^\pm W^{\mp } Z$$ H ± W ∓ Z vertex at the production level, that is, $$p p \rightarrow H^\pm j j$$ p p → H ± j j and $$p p \rightarrow Z H^\pm $$ p p → Z H ± . Moreover, we look into both $$H^\pm \rightarrow W^\pm Z,~t b$$ H ± → W ± Z , t b decays for either production process. Our investigations reveal that the $$H^\pm j j$$ H ± j j production process has a greater reach compared to $$Z H^\pm $$ Z H ± . Moreover, the discovery potential of a charged Higgs improves markedly with respect to the earlier studies corresponding to lower centre-of-mass energies. Finally, we recast our results in the context of the popular Georgi–Machacek model.

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Impact of Yukawa-like dimension-five operators on the Georgi-Machacek model

Cited by 18 publications

References 60 publications

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

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

Custodial symmetry, Georgi-Machacek model, and other scalar extensions

Probing the $$H^\pm W^{\mp } Z$$ interaction at the high energy upgrade of the LHC

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