Observation of the Decay $K^{+} \to π^{+} μ^{+} μ^{-}$

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15 December 1997

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 79 (24) , 4756-4759
https://doi.org/10.1103/physrevlett.79.4756

Abstract

We have observed the rare decay

K^{+} \to π^{+} μ^{+} μ^{-}

and measured the branching ratio

γ (K^{+} \to π^{+} μ^{+} μ^{-}) / γ (K^{+} \to all) = [5.0 \pm 0.4 (stat) \pm 0.7 (syst) \pm 0.6 (th)] \times 10^{- 8}

. We compare this result with predictions from chiral perturbation theory and estimates based on the decay

K^{+} \to π^{+} e^{+} e^{-}

.

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