The upper limit on the $K^{+}\to \ddot{I}{€}^0\ddot{I}{€}^0\ddot{I}{€}^0{e}^{+}\hat{I}½$ decay

Abstract

A search for the $K^{+}\to \ddot{I}{€}^0\ddot{I}{€}^0\ddot{I}{€}^0{e}^{+}\hat{I}½$ decay is performed by the OKA collaboration. The search is based on $3.65\times 10^9{K}^{+}$ decays. No signal is observed. The upper limit set is $BR(K^{+}\to \ddot{I}{€}^0\ddot{I}{€}^0\ddot{I}{€}^0{e}^{+}\hat{I}½)<5.4\times 10^{-8}90\%$ CL, 65 times lower than the one currently listed by PDG.