2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177682The seesaw theory, the leading theory for particle interactions, provides a viable mechanism for generating the matter-antimatter asymmetry of the universe. Testing the leptogenesis mechanism directly requires measurement of the d=6 operator of the low-energy effective Lagrangian, in addition to the more familiar d=5 operator which generates Majorana masses for the light neutrinos when the electroweak symmetry is spontaneously broken. This important experimental challenge awaits the next generation of particle physicists.7 pages, Proceedings Coral Gables 2003High Energy Physics - Phenomenologytext