With the discovery of the Higgs boson, we have confirmed the Standard Model (SM) of particle physics. However, the observation of neutrino oscillations provide undeniable evidence of physics beyond the SM. Many new signatures can emerge at high and low energy experiments from various New Physics (NP) constructions beyond the SM explaining neutrino masses. Among them one finds processes that violate lepton number, which would imply that the neutrinos are Majorana. These observables are currently being studied in various high-energy and high-intensity facilities, and if observed, will indicate a clear sign of new physics beyond the Standard Model. In this talk, I will discuss using a model independent picture how various low and high energy lepton number violating observables can shed light into the nature and origin of neutrino masses.
IFIC seminar organizers. Financiado por la Conselleria de Educación, Cultura, Universidades y Empleo - Proyecto CIPROM/2021/054.