Speaker
Description
Precise calculations of nuclear matrix elements provide a solid foundation in order to extract relevant data from current and upcoming neutrinoless double-beta decay experiments. These searches are key to unveil the nature of neutrinos as well as to access physics beyond the Standard Model due to the violation of the lepton number conservation in neutrinoless double-beta decay.
In this matter, the aim of this study consists on the evaluation of the impact of a newly acknowledged leading-order short-range term on the neutrinoless double-beta decay nuclear matrix element of medium-mass and heavy nuclei in the Nuclear Shell Model framework. As such, I will discuss the relative contribution of this leading-order short-range term to the total nuclear matrix element in the nuclei most relevant for experiments, ranging from 48Ca to 136Xe. I will also talk about the implications of the still-unknown relative sign of this term.
