2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46905The $K_L \to π^0 ν\barν$ decay is analyzed in a model independent way. When lepton flavor is conserved, this decay mode is a manifestation of CP violating interference between mixing and decay. Consequently, a theoretically clean relation between the measured rate and electroweak parameters holds in any given model.3 pages, latex, no figures. Talk given at the first symposium of FCNC, February 19-21, 1997, Santa Monica, CAHigh Energy Physics - Phenomenologytext