Scotogenic $U(1)_{L_{\mu}-L_{\tau}}$ origin of $(g-2)_\mu$, W-mass anomaly and 95 GeV excess

TL;DR

This paper proposes a scotogenic extension of a gauged $L_{}-L_{}$ model to simultaneously address the muon g-2 anomaly, W-mass discrepancy, and 95 GeV excess, while maintaining consistency with neutrino and dark matter observations.

Contribution

It introduces a minimal gauged $L_{}-L_{}$ model extension with an additional scalar doublet to explain multiple anomalies and phenomena, including the muon g-2, W-mass, and diphoton excess.

Findings

Successfully explains muon g-2 and W-mass anomalies.

Additional scalar doublet accounts for the 95 GeV diphoton excess.

Model remains consistent with neutrino masses and dark matter constraints.

Abstract

We study a scotogenic extension of the minimal gauged $L_{\mu}-L_{\tau}$ model, including three right-handed singlet fermions and a scalar doublet all odd under an in-built $Z_2$ symmetry to explain the anomalous magnetic moments of the muon, CDF-II W-mass anomaly, and the 95 GeV excess reported by the CMS collaboration. While the minimal model can successfully explain the muon $(g-2)$ and CDF-II W-mass anomalies, the required diphoton signal strength for the 95 GeV scalar, together with that of the SM Higgs, can not be obtained in the minimal model. The same can, however, be explained by incorporating one additional scalar doublet whose only role is to contribute radiatively to diphoton decay modes of the light, neutral scalars. Due to the scotogenic extension, the model remains consistent with the observed properties of light neutrinos and dark matter in the Universe.