A New Measurement of the Rare Decay $K^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$

H. Ma, R. Appel, G. S. Atoyan +25

More than 400 $K^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ events were observed in a rare $K^{+}$ decay experiment at the AGS. Normalized to the $K^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay, the branching ratio is determin…