Phys. Rev. Lett. 79, 4756–4759 (1997)Observation of the Decay K+→π+μ+μ-Received 29 July 1997; published in the issue dated 15 December 1997 We have observed the rare decay K+→π+μ+μ- and measured the branching ratio γ(K+→π+μ+μ-)/γ(K+→all) = [5.0±0.4(stat)±0.7(syst)±0.6(th)]×10-8. We compare this result with predictions from chiral perturbation theory and estimates based on the decay K+→π+e+e-. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.4756
DOI:
10.1103/PhysRevLett.79.4756
PACS:
13.20.Eb, 12.39.Fe
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