Dynamical inverse seesaw mechanism as a simple benchmark for electroweak breaking and Higgs boson studies

Mandal, Sanjoy; Romão, Jorge C.; Srivastava, Rahul; Valle, José W. F.

doi:10.48550/arxiv.2103.02670

Cited by 3 publications

(3 citation statements)

References 38 publications

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“…Although the idea of a dynamical origin for these small parameters is not new, see for example Refs. [48][49][50][51][52], it is the first time that it is linked to the flavour problem. In particular, we argue that, in order to explain the smallness of µ ( ) and , instead of the usual choice of lepton number, a larger symmetry can be considered, providing further links to the quark sector.…”

Section: Introductionmentioning

confidence: 99%

Dynamical Minimal Flavour Violating Inverse Seesaw

Arias-Aragón¹,

Fernández‐Martínez²,

González-López³

et al. 2022

Preprint

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The Inverse Seesaw mechanism is dynamically realised within the Minimal Lepton Flavour Violation context. Lepton number, whose breaking is spontaneously realised, is generalised to a global Abelian factor of the whole flavour symmetry, that also plays the role of the Peccei-Quinn symmetry. The associated Goldstone boson is a Majoraxion that solves the Strong CP problem and represents a Dark Matter candidate.Three distinct scenarios are identified in terms of flavour symmetry and transformation properties of the exotic neutral leptons that enrich the Standard Model spectrum. The associated phenomenology is studied, focusing on the deviations from unitarity of the PMNS mixing matrix. The strongest constraints arise from the determination of the number of active neutrinos through the invisible width of the Z, the comparison of the measured W boson mass with its prediction in terms of the Fermi constant from muon decay, and the null searches for the radiative rare muon decay and µ → e conversion in nuclei. The heavy neutral leptons may have masses of a few TeV, leaving open the possibility for a direct detection at future colliders.The impact of the recent measurement of the W mass at the CDF II detector has also been considered, which, in one of the scenarios, points to a sharp prediction for the masses of the heavy neutral leptons at about 2 − 3 TeV.

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Section: Introductionmentioning

confidence: 99%

Dynamical Minimal Flavour Violating Inverse Seesaw

Arias-Aragón¹,

Fernández‐Martínez²,

González-López³

et al. 2022

Preprint

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show abstract

“…However, it has been pointed out that this result in turn leads to some tension with electroweak data [14]. 3 See also [24,25] for discussions of generalized inverse seesaw models, including versions with Dirac neutrinos, [26][27][28][29] for four references studying the phenomenology of light fermion triplets and [30] for a recent work on the inverse seesaw with spontaneous violation of lepton number.…”

Section: Introductionmentioning

confidence: 99%

$\boldsymbol{(g-2)_{e,μ}}$ in an extended inverse type-III seesaw

Escribano,

Terol-Calvo,

Vicente

2021

Preprint

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There has been a long-standing discrepancy between the experimental measurements of the electron and muon anomalous magnetic moments and their predicted values in the Standard Model. This is particularly relevant in the case of the muon g − 2, which has attracted a remarkable interest in the community after the long-awaited announcement of the first results by the Muon g − 2 collaboration at Fermilab, which confirms a previous measurement by the E821 experiment at Brookhaven and enlarges the statistical significance of the discrepancy, now at 4.2σ. In this paper we consider an extension of the inverse type-III seesaw with a pair of vector-like leptons that induces masses for neutrinos at the electroweak scale and show that one can accommodate the electron and muon anomalous magnetic moments, while being compatible with all relevant experimental constraints.

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“…In this work we investigate a dynamical origin for the small Lepton number breaking of the inverse Seesaw scenario. Several constructions based on dynamical Lepton number breaking have been explored in the past [12][13][14][15][16][17][18][19][20]. In this work, we consider a Seesaw-like mechanism in the scalar sector so that a small vacuum expectation value is naturally induced for the scalar with Lepton number two [14].…”

Section: Introductionmentioning

confidence: 99%

Inverse Seesaw, dark matter and the Hubble tension

Fernandez-Martinez,

Pierre,

Pinsard

et al. 2021

Preprint

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We consider the inverse Seesaw scenario for neutrino masses with the approximate Lepton number symmetry broken dynamically by a scalar with Lepton number two. We show that the Majoron associated to the spontaneous symmetry breaking can alleviate the Hubble tension through its contribution to ∆N eff and late decays to neutrinos. Among the additional fermionic states required for realizing the inverse Seesaw mechanism, sterile neutrinos at the keV-MeV scale can account for all the dark matter component of the Universe if produced via freeze-in from the decays of heavier degrees of freedom.

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Dynamical inverse seesaw mechanism as a simple benchmark for electroweak breaking and Higgs boson studies

Cited by 3 publications

References 38 publications

Dynamical Minimal Flavour Violating Inverse Seesaw

Dynamical Minimal Flavour Violating Inverse Seesaw

$\boldsymbol{(g-2)_{e,μ}}$ in an extended inverse type-III seesaw

Inverse Seesaw, dark matter and the Hubble tension

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