Nonminimal 331 model for lepton flavor universality violation in 
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 decays

Descotes-Genon, S.; Moscati, Marta; Ricciardi, Giulia

doi:10.1103/physrevd.98.115030

Cited by 24 publications

(27 citation statements)

References 89 publications

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“…As advertised above, this property is welcome, because new off-diagonal contributions to products of currents with F = F are severely constrained by data, in particular meson mixings (F = F = d) and respectively purely leptonic LFV decays such as τ → 3µ (F = F = ). In the absence of such mechanism, these processes would pose the most formidable constraints, as they do in other SM extensions by gauge groups, in particular W , Z ones (see in particular [21,[43][44][45]). In fact, these constraints are perhaps the most outstanding reason in favour of models with lepto-quark mediators, whereby J × J and J q × J q currents 4 are generated only at loop level.…”

Section: Jhep11(2018)163mentioning

confidence: 99%

A gauged horizontal SU(2) symmetry and $$ {R}_{K^{\left(\ast \right)}} $$

Guadagnoli

Reboud

Sumensari

2018

J. High Energ. Phys.

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One of the greatest challenges for models of b → s anomalies is the necessity to produce a large contribution to a quark times a lepton current, J q × J , and to avoid accordingly large contributions to flavour-changing J q ×J q and J ×J amplitudes, which are severely constrained by data. We consider a gauged horizontal symmetry involving the two heaviest generations of all left-handed fermions. In the limit of degenerate masses for the horizontal bosons, and in the absence of mixing between the two heavier generations and the lighter one, such symmetry would make J q × J q and J × J amplitudes exactly flavourdiagonal. Mixing with the first generation is however inescapable due to the CKM matrix, and the above mechanism turns out to be challenged by constraints such as D 0 −D 0 mixing. Nonetheless, we show that a simultaneous description of all data can be accomplished by simply allowing for non-degenerate masses for the horizontal bosons. Such scenario predicts modifications in several processes that can be tested at present and upcoming facilities. In particular, it implies a lower and upper bound for B(B → Kµ ± τ ∓), an asymmetry between its two charge conjugated modes, and well-defined correlations with LFV in τ decays.

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Section: Jhep11(2018)163mentioning

confidence: 99%

A gauged horizontal SU(2) symmetry and $$ {R}_{K^{\left(\ast \right)}} $$

Guadagnoli

Reboud

Sumensari

2018

J. High Energ. Phys.

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“…Apart from these explanations, the R K and R K Ã anomalies can also be explained in models with extended SUð3Þ C × SUð3Þ L × Uð1Þ 0 symmetry, with nonminimal particle content, as done in Ref. [23]. Finally, a vector leptoquark in the Standard Model representation ð3; 1Þ 2=3 arising from a Pati-Salam-like theory has been shown for the first time to provide a good fit to the R K Ã anomalies [24].…”

Section: Introductionmentioning

confidence: 81%

Muon anomalies and the SU(5) Yukawa relations

Hernández

King

2019

Phys. Rev. D

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We show that, within the framework of SUð5Þ grand unified theories (GUTs), multiple vectorlike families at the GUT scale which transform under a gauged Uð1Þ 0 (under which the three chiral families are neutral) can result in a single vectorlike family at low energies which can induce nonuniversal and flavorful Z 0 couplings, which can account for the B physics anomalies in R K ðÃÞ. In such theories, we show that the same muon couplings which explain R K ðÃÞ also correct the Yukawa relation Y e ¼ Y T d in the muon sector without the need for higher Higgs representations. To illustrate the mechanism, we construct a concrete model based on SUð5Þ × A 4 × Z 3 × Z 7 with two vectorlike families at the GUT scale, and two righthanded neutrinos, leading to a successful fit to quark and lepton (including neutrino) masses, mixing angles, and CP phases, where the constraints from lepton-flavor violation require Y e to be diagonal.

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“…Addressing the R K and R K * anomalies in the framework of a 3-3-1 model would require to consider five families of SU(3) L leptonic triplets as done in ref. [36], in order to have different U(1) X charge assignments for the first and second lepton families, without spoiling the anomaly cancellation conditions. Thus, modifying the inert 3-3-1 model of ref.…”

Section: Jhep06(2019)056 7 Discussion and Conclusionmentioning

confidence: 99%

Sequentially loop-generated quark and lepton mass hierarchies in an extended Inert Higgs Doublet model

Hernández

Kovalenko

Pasechnik

et al. 2019

J. High Energ. Phys.

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Extended scalar and fermion sectors offer new opportunities for generating the observed strong hierarchies in the fermion mass and mixing patterns of the Standard Model (SM). In this work, we elaborate on the prospects of a particular extension of the Inert Higgs doublet model where the SM hierarchies are generated sequentially by radiative virtual corrections in a fully renormalisable way, i.e. without adding any non-renormalisable Yukawa terms or soft-breaking operators to the scalar potential. Our model has a potential to explain the recently observed R K and R K∗ anomalies, thanks to the non universal U1X assignments of the fermionic fields that yield non universal Z′ couplings to fermions. We explicitly demonstrate the power of this model for generating the realistic quark, lepton and neutrino mass spectra. In particular, we show that due to the presence of both continuous and discrete family symmetries in the considered framework, the top quark acquires a tree-level mass, lighter quarks and leptons get their masses at one- and two-loop order, while neutrino masses are generated at three-loop level. The minimal field content, particle spectra and scalar potential of this model are discussed in detail.

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Nonminimal 331 model for lepton flavor universality violation in b→sℓℓ decays

Cited by 24 publications

References 89 publications

A gauged horizontal SU(2) symmetry and $$ {R}_{K^{\left(\ast \right)}} $$

A gauged horizontal SU(2) symmetry and $$ {R}_{K^{\left(\ast \right)}} $$

Muon anomalies and the SU(5) Yukawa relations

Sequentially loop-generated quark and lepton mass hierarchies in an extended Inert Higgs Doublet model

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