A possible connection between neutrino mass generation and the lightness of a NMSSM pseudoscalar

TL;DR

This paper explores an extension of the NMSSM with two singlets to connect neutrino mass generation via inverse see-saw to the existence of a light pseudoscalar, while satisfying experimental constraints.

Contribution

It introduces a novel NMSSM extension with two singlets that enables neutrino mass generation and allows a light pseudoscalar to evade experimental bounds.

Findings

Neutrino masses can be generated via inverse see-saw in the extended NMSSM.

The model provides dominant invisible decay channels for the pseudoscalar.

The scenario remains consistent with current experimental constraints.

Abstract

One of the interesting properties of the NMSSM is that it can accommodate a light pseudoscalar of order 10 GeV. However, such scenarios are challenged by several experimental constraints, especially those related to the fermionic decays of the pseudoscalar. In this Letter, we extend the NMSSM field content by two gauge singlets, with lepton numbers +1 and -1. This serves the twin purpose of generating neutrino masses via the inverse see-saw mechanism and keeping the option of a very light pseudoscalar experimentally viable by opening dominant invisible decay channels of the pseudoscalar which help it evade the existing bounds.