The singly-charged scalar singlet as the origin of neutrino masses

Felkl, Tobias; Herrero-García, Juan; Schmidt, Michael A.

doi:10.1007/jhep05(2021)122

Cited by 18 publications

(10 citation statements)

References 119 publications

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“…We compared our results with previous literature on the phenomenology of the Zee model [33], the two-Higgs-doublet model [35,103] (Zee in the limit δ → 0), and the SM plus δ only [104] (Zee in the limit 2 → 0), finding agreement where there is an intersection, except for a typo in the shift of m W in [104].…”

Section: + Cmentioning

confidence: 54%

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: + Cmentioning

confidence: 54%

Effective comparison of neutrino-mass models

Coy,

Frigerio

2021

Preprint

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“…Three single-field models contribute to C HD , and four to C the possibility in principle of discriminating between the different CDF-friendly single-field extensions of the SM. We note that model S 1 generates a negative contribution to C (due to the antisymmetry of the S 1 Yukawa matrix in flavour space [47,48]) whereas the data prefer a positive value, that Σ and Σ 1 generate positive contributions to C…”

Section: Probing Single-field Extensions Of the Standard Modelmentioning

confidence: 83%

SMEFT analysis of mW

Bagnaschi

Ellis

Madigan

et al. 2022

J. High Energ. Phys.

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We use the Fitmaker tool to incorporate the recent CDF measurement of mW in a global fit to electroweak, Higgs, and diboson data in the Standard Model Effective Field Theory (SMEFT) including dimension-6 operators at linear order. We find that including any one of the SMEFT operators $$ \mathcal{O} $$ O HWB, $$ \mathcal{O} $$ O HD, $$ \mathcal{O} $$ O ℓℓ or $$ {\mathcal{O}}_{H\ell}^{(3)} $$ O H ℓ 3 with a non-zero coefficient could provide a better fit than the Standard Model, with the strongest pull for $$ \mathcal{O} $$ O HD and no tension with other electroweak precision data. We then analyse which tree-level single-field extensions of the Standard Model could generate such operator coefficients with the appropriate sign, and discuss the masses and couplings of these fields that best fit the CDF measurement and other data. In particular, the global fit favours either a singlet Z′ vector boson, a scalar electroweak triplet with zero hypercharge, or a vector electroweak triplet with unit hypercharge, followed by a singlet heavy neutral lepton, all with masses in the multi-TeV range for unit coupling.

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“…Due to hermicity of the Lagrangian it has anti-symmetric (i.e. off-diagonal) couplings it results in an effect in muon decay with the right sign such that in can explain the CAA via an shift in the Fermi constant [36][37][38][39].…”

Section: Singly Charged Su (2) L Singlet Scalarmentioning

confidence: 99%

Explaining the Cabibbo Angle Anomaly

Crivellin¹

2022

Preprint

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The determinations of the Cabibbo angle from kaon, pion, D and tau decays disagree with the one from super-allowed beta decays. The resulting ≈ 3 σ deficit in first row (but also first column) CKM unitarity is known as the Cabibbo angle anomaly (CAA). Determining V ud from beta decays requires knowledge of the Fermi constant GF , usually extracted from muon decay. However, because new physics might also affect muon decay, and thus the determination of the Fermi constant, an interesting interplay with the global electroweak fit arises where GF is a crucial input. In these proceedings we review the CAA and its different interpretations in terms of physics beyond the SM, first discussing the corresponding effect in the effective field theory and then using (simplified) models.

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The singly-charged scalar singlet as the origin of neutrino masses

Cited by 18 publications

References 119 publications

Effective comparison of neutrino-mass models

Effective comparison of neutrino-mass models

SMEFT analysis of mW

Explaining the Cabibbo Angle Anomaly

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