Light neutrino and heavy particle exchange in $\text{nbb}$-decay

Abstract

A simple and precise method is presented to compare contributions to neutrinoless double-beta decay ($\text{nbb}$-decay) from heavy particle exchange and light Majorana neutrino exchange. This procedure makes no assumptions about the momentum transfer between the two nucleons involved in the $\text{nbb}$-decay process. It is shown that for a general particle physics model, the characteristic $\text{nbb}$-decay scale $>4.4$ TeV when all the coupling constants are assumed to be natural and of $\mathcal{O}(1)$.

Comments: 4 pages