ANTICIPATION. “The discovery of substantial leptonic CP violation would be groundbreaking. Its observation, together with evidence that a quantity known as lepton number has been violated (that is, not conserved), would provide strong circumstantial evidence for leptogenesis as the origin of the matter–antimatter imbalance.” (CP = charge-conjugation parity-reversal).
https://www.nature.com/articles/d41586-020-01000-9