Rare Electroweak Processes $K_L^0\to {\mu }^{+}{\mu }^{-}$ and $K_L^0\to \gamma \gamma$ and Heavy Top Quark

Abstract

A brief overview of the recent measurements of the branching ratio of the rare $K_L^0\to {\mu }^{+}{\mu }^{-}$ decay in the context of their agreement with the Standard Model (SM) is given. It is shown that KEK result well correlates with the SM and B-physics, whereas the BNL results are in conflict with the SM with the heavy top quark.

Comments: (talk given at the 5th Conference on the Intersections of Particle and Nuclear Physics, St. Petersburg, Florida, USA, May 31-June 6, 1994), 6 pages, LaTeX, Yaroslavl, Yaroslavl State University preprint YARU-HE-94/08