The $K_L\to {\pi }^0\nu \bar{\nu }$ Decay Beyond the Standard Model

Abstract

The $K_L\to {\pi }^0\nu \bar{\nu }$ 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.

Comments: 3 pages, latex, no figures. Talk given at the first symposium of FCNC, February 19-21, 1997, Santa Monica, CA