Search for the Decay $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\overline{\hat{I}}½$

Abstract

An upper limit on the branching ratio for the decay $K^{+}\to \ddot{I}{€}^{+}\hat{I}½\overline{\hat{I}}½$ is set at $2.4\times 10^{-9}$ at the 90\% C.L. using pions in the kinematic region $214\mathrm{MeV}/c<P_{\ddot{I}}€<231\mathrm{MeV}/c$. An upper limit of $5.2\times 10^{-10}$ is found on the branching ratio for decays $K^{+}\to \ddot{I}{€}^{+}{X}^0$, where $X^0$ is any massless, weakly interacting neutral particle. Limits are also set for cases where $M_{X^0}>0$.

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