Search for the Decay K L0-->pi0nu nu[over]

Phys Rev Lett. 2008 May 23;100(20):201802. doi: 10.1103/PhysRevLett.100.201802. Epub 2008 May 22.

Abstract

We performed a search for the K L0-->pi0nu nu[over] decay at the KEK 12-GeV proton synchrotron. No candidate events were observed. An upper limit on the branching ratio for the decay was set to be 6.7 x 10(-8) at the 90% confidence level.