Observation of the decay K+ → π+ μ+ μ

S. Adler, M. S. Atiya, I. H. Chiang, J. S. Frank, J. S. Haggerty, T. F. Kycia, K. K. Li, L. S. Littenberg, A. Sambamurti, A. Stevens, R. C. Strand, C. Witzig, W. C. Louis, M. Ardebili, M. Convery, M. M. Ito, D. R. Marlow, R. Mc Pherson, P. D. Meyers, M. A. SelenF. C. Selen, A. J.S. Smith, E. W. Blackmore, D. A. Bryman, L. Felawka, A. Konaka, Y. Kuno, J. A. Macdonald, T. Numao, P. Padley, J. M. Poutissou, R. Poutissou, J. Roy, A. S. Turcot, P. Kitching, T. Nakano, M. Rozon, R. Soluk

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46 Scopus citations


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

Original languageEnglish (US)
Pages (from-to)4756-4759
Number of pages4
JournalPhysical review letters
Issue number24
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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