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

TL;DR

This paper explores an extended inverse type-III seesaw model with vector-like leptons to explain the longstanding discrepancies in electron and muon magnetic moments, aligning with experimental data.

Contribution

It introduces a novel extension of the inverse type-III seesaw model that successfully accounts for anomalous magnetic moments of electron and muon.

Findings

Model accommodates electron and muon g-2 discrepancies

Compatible with current experimental constraints

Induces neutrino masses at the electroweak scale

Abstract

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 $4.2 \sigma$. 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.