$(g-2)$ anomalies and neutrino mass

TL;DR

This paper investigates how a neutrino mass model can explain the observed anomalies in the magnetic moments of electrons and muons, proposing specific model variants and predicting testable collider signatures.

Contribution

It introduces a neutrino mass model that can simultaneously account for both electron and muon g-2 anomalies, extending the original BNT model with a triplet scalar.

Findings

The original BNT model explains the muon g-2 anomaly.

The extended model with a triplet scalar explains both electron and muon anomalies.

Predicted decay patterns of exotic fermions at the LHC.

Abstract

Motivated by the experimentally observed deviations from standard model predictions, we calculate the anomalous magnetic moments $a_\alpha = (g-2)_\alpha$ for $\alpha=e,\mu$ in a neutrino mass model originally proposed by Babu-Nandi-Tavartkiladze (BNT). We discuss two variants of the model, the original model plus a minimally extended version with an additional hypercharge zero triplet scalar. While the original BNT model can explain $a_\mu$, only the variant with the triplet scalar can explain both experimental anomalies. The heavy fermions of the model can be produced at the high-luminosity LHC and in the part of parameter space, where the model explains the experimental anomalies, it predicts certain specific decay patterns for the exotic fermions.