Minimal Zee model for lepton ${g-2}$ and $W$-mass shifts

TL;DR

This paper proposes a minimal Zee model with a specific Yukawa structure that explains neutrino oscillations, addresses the muon g-2 anomaly, and accounts for recent W-boson mass measurements, predicting distinctive neutrino and Higgs decay features.

Contribution

It introduces a minimal Yukawa structure in the Zee model that simultaneously explains neutrino data, muon g-2, and W-mass shifts with specific predictions for neutrino mixing and Higgs decays.

Findings

Neutrino masses are quasi-degenerate with normal or inverted ordering.

Predicted mixing angle θ23 in the second or first octant depending on ordering.

Large branching ratio of heavy Higgs into electron and muon pairs.

Abstract

We present a unique Yukawa structure of the Zee model that can accommodate neutrino oscillation data, solves the muon ${g-2}$ problem, and explains the recent $W$ boson mass measurement. Our Yukawa structure is minimal in the sense that it contains the least possible number of parameters. In this minimal scenario, neutrino masses are quasidegenerate and are compatible with both normal and inverted orderings. The mixing angle $\theta_{23}$ is predicted to lie in the second (first) octant for normal (inverted) ordering. In both cases, the CP violating phase is close to 3$\pi/2$. The minimal texture also predicts a large branching fraction of the heavy neutral Higgs boson into a pair of electron and muon.