Status of the Large Enriched Germanium Experiment for Neutrinoless ββ Decay - LEGEND

Definitive evidence for non-zero neutrino masses from oscillation experiments has been available for nearly two decades. However, the incorporation of neutrino masses into the Standard Model (SM) of particle physics remains an open issue. Because it is electrically neutral, the neutrino is the only known fundamental fermion that could be its own anti-particle, and obtain its mass through a Majorana mass term. The motivation to test the Majorana nature of the neutrino has never been higher. At present, the only feasible method for testing a pure-Majorana SM neutrino without requiring new fields or symmetries is to search for neutrinoless doublebeta (0νβββ) decay