Universal scalar leptoquark action for matching

Dedes, Athanasios; Mantzaropoulos, Kostas

doi:10.1007/jhep11(2021)166

Cited by 21 publications

(14 citation statements)

References 78 publications

(130 reference statements)

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“…The WCs of bosonic operators in a two-Higgs-doublet model have been matched at one-loop in [44]. The one-loop matching of the SM extended by S was performed in [45] and the matching of the SM augmented by both the S and D was completed by [21]. We find general agreement, except for the one-loop finite contribution of the LQ D to c eB in [21], see the discussion around Eq.…”

Section: Wcsmentioning

confidence: 61%

“…In light of these considerations, the minimal LQ model that induces both dipoles and neutrino masses at one loop and without y e suppression is obtained by extending the SM with two scalar LQ multiplets, a weak doublet, D ∼ (3, 2) 1/6 , and a weak singlet, S ∼ (3, 1) −1/3 . 2 This combination of LQs has recently been studied in [19][20][21], partly with similar motivations to ours. The Lagrangian reads…”

Section: The Minimal Leptoquark Modelmentioning

confidence: 65%

“…preliminary results on type-III were presented in a PhD thesis [18]. In addition, we will consider two models which induce neutrino masses at one loop: the well-known Zee model [8], involving a second Higgs doublet and a weak-singlet scalar; and a less studied, minimal model of leptoquarks (LQs) [19][20][21], chosen to induce both neutrino masses [22][23][24] and dipole operators without chiral suppression [25][26][27]. We stress that the various EFT tools employed in our analysis could be easily applied to any other model of new physics, in the lepton sector and beyond.…”

Section: Introductionmentioning

confidence: 99%

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Effective comparison of neutrino-mass models

Coy,

Frigerio

2021

Preprint

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New physics in the lepton sector may account for neutrino masses, affect electroweak precision observables, induce charged-lepton flavour violation, and shift dipole moments. The low-energy predictions of different models are most conveniently compared within the formalism of effective field theory. To illustrate the benefits of this approach, we derive the Wilson coefficients for a set of representative models: the fermionic seesaw mechanisms (type I and III), the Zee model, and a minimal leptoquark model. In each case, the Weinberg and the dipole operators have qualitatively different origins. In parallel, we present the model-independent constraints on the Wilson coefficients coming from various lepton observables. We then show that it becomes straightforward to understand the allowed parameter space for each model, and to discriminate between them. The Zee and leptoquark models are suitable to address the muon g − 2 anomaly.

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Section: Wcsmentioning

confidence: 61%

Section: The Minimal Leptoquark Modelmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Effective comparison of neutrino-mass models

Coy,

Frigerio

2021

Preprint

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“…which agrees with the results in refs. [34,[69][70][71]. We now have all the ingredients to determine the misalignment of the flavour phases entering eq.…”

Section: Jhep03(2022)011mentioning

confidence: 99%

Flavour alignment of New Physics in light of the (g − 2)μ anomaly

Isidori

Pagès

Wilsch

2022

J. High Energ. Phys.

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We investigate the flavour alignment conditions that New Physics (NP) models need to satisfy in order to address the (g − 2)μ anomaly and, at the same time, be consistent with the tight bounds from μ → eγ and τ → μγ. We analyse the problem in general terms within the SMEFT, considering the renormalisation group evolution of all the operators involved. We show that semileptonic four-fermion operators, which are likely to generate a sizeable contribution to the (g − 2)μ anomaly, need to be tightly aligned to the lepton Yukawa couplings and the dipole operators in flavour space. While this tuning can be achieved in specific NP constructions, employing particular dynamical assumptions and/or flavour symmetry hypotheses, it is problematic in a wide class of models with broken flavour symmetries, such as those proposed to address both charged- and neutral-current B anomalies. We quantify this tension both in general terms, and in the context of explicit NP constructions.

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“…which agrees with the results in Refs. [22,48,49]. We now have all the ingredients to determine the flavour phases misalignment entering Eq.…”

Section: Alignment In An Explicit Np Modelmentioning

confidence: 99%

Flavour alignment of New Physics in light of the $(g-2)_μ$ anomaly

Isidori,

Pagès,

Wilsch

2021

Preprint

View full text Add to dashboard Cite

We investigate the flavour alignment conditions that New Physics (NP) models need to satisfy in order to address the (g − 2) µ anomaly and, at the same time, be consistent with the tight bounds from µ → eγ and τ → µγ. We analyse the problem in general terms within the SMEFT, considering the renormalisation group evolution of all the operators involved. We show that semileptonic four-fermion operators, which are likely to generate a sizeable contribution to the (g − 2) µ anomaly, need to be tightly aligned to the lepton Yukawa couplings and the dipole operators in flavour space. While this tuning can be achieved in specific NP constructions, employing particular dynamical assumptions and/or flavour symmetry hypotheses, it is problematic in a wide class of models with broken flavour symmetries, such as those proposed to address both chargedand neutral-current B anomalies. We quantify this tension both in general terms, and in the context of explicit NP constructions.

show abstract

Universal scalar leptoquark action for matching

Cited by 21 publications

References 78 publications

Effective comparison of neutrino-mass models

Effective comparison of neutrino-mass models

Flavour alignment of New Physics in light of the (g − 2)μ anomaly

Flavour alignment of New Physics in light of the $(g-2)_μ$ anomaly

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