Doubly charged scalars and vector-like leptons confronting the muon g-2 anomaly and Higgs vacuum stability

TL;DR

This paper proposes an extended Standard Model with new scalars and vector-like leptons to address the muon g-2 anomaly, generate neutrino masses, and stabilize the Higgs vacuum up to the Planck scale.

Contribution

It introduces a novel combination of scalar and fermionic fields that simultaneously explains muon g-2, neutrino masses, and electroweak vacuum stability.

Findings

Parameter regions that solve muon g-2 and neutrino masses also stabilize the vacuum.

The model achieves vacuum stability up to the Planck scale.

The proposed extensions are consistent with current experimental constraints.

Abstract

The present work introduces new scalar and fermionic degrees of freedom to the Standard Model. While the scalar sector is augmented by a complex scalar triplet and a doubly charged scalar singlet, the fermionic sector is extended by two copies of vector-like leptons. Of these, one copy is an $SU(2)_L$ singlet while the other, an $SU(2)_L$ doublet. We explain how this combination can offer a solution to the muon g-2 anomaly and also lead to non-zero neutrino masses. In addition, it is also shown that the parameter regions compliant with the two aforementioned issues can stabilise the electroweak vacuum till the Planck scale, something not possible within the Standard Model alone.