Explaining $(g-2)_{\mu,e}$, the KOTO anomaly and the MiniBooNE excess in an extended Higgs model with sterile neutrinos

TL;DR

This paper proposes an extended Higgs model with sterile neutrinos that can simultaneously explain the muon and electron anomalous magnetic moments, KOTO anomalies, and MiniBooNE excess, while also providing a dark matter candidate.

Contribution

It introduces a simple extension of the Standard Model with a complex scalar and sterile neutrinos to address multiple anomalies and dark matter within a unified framework.

Findings

The model explains the muon and electron g-2 anomalies.

It accounts for KOTO anomalous events.

It reproduces the MiniBooNE excess and dark matter relic abundance.

Abstract

We consider a simple extension of the Standard Model (SM) by a complex scalar doublet and a singlet along with three sterile neutrinos. The sterile neutrinos mix with the SM neutrinos to produce three light neutrino states consistent with the oscillation data and three heavy sterile states. The lightest sterile neutrino has lifetime longer than the age of the Universe and can provide correct dark matter relic abundance. Utilizing tree-level flavor changing interactions of a light scalar with mass~$\sim\mathcal{O}(100)$~MeV along with sterile neutrinos, we can explain the anomalous magnetic moments of both muon and electron, KOTO anomalous events and the MiniBooNE excess simultaneously.