Lower Mass Bound on the $W^\prime$ mass via Neutrinoless Double Beta Decay in a 3-3-1 Model

TL;DR

This paper investigates how neutrinoless double beta decay constrains the mass of a hypothetical $W'$ boson in a 3-3-1 model, resulting in bounds that challenge the model's viability.

Contribution

It provides new bounds on the $W'$ mass from neutrinoless double beta decay, surpassing collider limits and questioning the minimal 3-3-1 model's validity.

Findings

Bounds on $W'$ mass exceed collider limits.

Constraints push symmetry breaking scale beyond model validity.

Minimal 3-3-1 model is effectively excluded.

Abstract

The discovery of neutrino masses has raised the importance of studies in the context of neutrinoless double beta decay, which constitutes a landmark for lepton number violation. The standard interpretation is that the light massive neutrinos, that we observed oscillating in terrestrial experiments, mediate double beta decay. In the minimal 3-3-1 model, object of our study, there is an additional contribution that stems from the mixing between a new charged vector boson, $W^{\prime}$, and the Standard Model W boson. Even after setting this mixing to be very small, we show that tight constraints arise from the non-observation of neutrinoless double beta decay. Indeed, we derive bounds on the mass of the $W^{\prime}$ gauge boson that might exceed those from collider probes, and most importantly push the scale of symmetry breaking beyond its validity, leading to the exclusion of the minimal 3-3-1 model.