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The discovery of neutrino masses has raised the importance of studies in thecontext of neutrinoless double beta decay, which constitutes a landmark forlepton number violation. The standard interpretation is that the light massiveneutrinos, that we observed oscillating in terrestrial experiments, mediatedouble beta decay. In the minimal 3-3-1 model, object of our study, there is anadditional contribution that stems from the mixing between a new charged vectorboson, $W^{\prime}$, and the Standard Model W boson. Even after setting thismixing to be very small, we show that tight constraints arise from thenon-observation of neutrinoless double beta decay. Indeed, we derive bounds onthe mass of the $W^{\prime}$ gauge boson that might exceed those from colliderprobes, and most importantly push the scale of symmetry breaking beyond itsvalidity, leading to the exclusion of the minimal 3-3-1 model.

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