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

Arturo de Giorgi; Luca Merlo; Stefan Pokorski

doi:10.1002/prop.202300020

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arXiv · 2211.03797

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

Arturo de Giorgi·Luca Merlo·Stefan Pokorski

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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.

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Arturo de Giorgi, Luca Merlo, Stefan Pokorski. 2022-11-07. The Low-Scale Seesaw Solution to the $M_W$ and $(g-2)_\mu$ Anomalies. https://doi.org/10.1002/prop.202300020

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