Further Observation of the DecayKL0→μ+μ−

A new search for the decay ${K_L}^0\to {\mu }^{+}{\mu }^{-}$ has been performed at the Brookhaven National Laboratory alternating-gradient synchrotron. We used the experimental technique employed by Carithers et al., with some modifications to suppress the background further and eliminate possible systematic effects. The analysis of this experiment yields three events satisfying criteria for this decay mode.