New limit on the $K_L^0\to {\pi }^0\nu \bar{\nu }$ decay rate

E391a Collaboration, J. K. Ahn

The first dedicated experiment for the rare kaon decay $K_L^0\to {\pi }^0\nu \bar{\nu }$ has been performed by the E391a collaboration at the KEK 12-GeV proton synchrotron. A new upper limit…