The Low-Scale Seesaw Solution to the $M_W$ and $(g-2{)}_{\mu }$ Anomalies

Abstract

The recent CDF-II measurement of the $W$-boson mass shows a strong tension with the corresponding Standard Model prediction. Once active neutrino masses are explained in the context of the Low-Scale Seesaw mechanisms, this tension can be resolved. We investigate the possibility of explaining the longstanding muon anomalous magnetic moment anomaly within the same frameworks. We present a simplified extension of the Standard Model, accounting only for the second lepton generation, that describes a massive active neutrino and provides a combined solution to these anomalies. The model is renormalisable and introduces in the spectrum, beyond the sterile species of the Low-Scale Seesaw mechanism, only one pair of exotic vector-like leptons, doublets under the electroweak symmetry. We moreover discuss the extension of this model to the realistic three-family case.

30 pages, 9 figures

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Cited by in corpus (7)

• Minimal model for the $W$-boson mass, $(g-2{)}_{\mu }$, $h\to {\mu }^{+}{\mu }^{-}$ and quark-mixing-matrix unitarity
• Connecting $(g-2{)}_{\mu }$ to neutrino mass in the extended neutrinophilic 2HDM
• Visible GeV ALP from TeV Vector-like Leptons
• An $SU(5)\times U(1{)}^{\prime }$ SUSY GUT with a "vector-like chiral" fourth family to fit all low energy data, including the muon $g-2$
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• Collider imprint of vector-like leptons in light of anomalous magnetic moment and neutrino data
• Interplay between Vector-like Lepton and Seesaw Mechanism:Oblique Corrections