Observation of the Decay K+ --> pi+ mu+ mu-

A. J. S. Smith; A. Konaka; A. Sambamurti; A. Stevens; A. S. Turcot; C. Witzig; D. A. Bryman; D. R. Marlow; D. S. Akerib; E787 Collaboration: S. Adler

arxiv: hep-ex/9708012 · v2 · submitted 1997-08-07 · ✦ hep-ex

Observation of the Decay K+ --> pi+ mu+ mu-

E787 Collaboration: S. Adler , M. S. Atiya , I-H. Chiang , J. S. Frank , J. S. Haggerty , T. F. Kycia , K. K. Li , L. S. Littenberg

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A. Sambamurti A. Stevens R. C. Strand C. Witzig W. C. Louis D. S. Akerib M. Ardebili M. R. Convery M. M. Ito D. R. Marlow R. A. McPherson P. D. Meyers M. A. Selen F. C. Shoemaker 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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We have observed the rare decay K+ --> pi+ mu+ mu- and measured the branching ratio Gamma(K+ --> pi+ mu+ mu-)/Gamma(K+ --> all) = (5.0 +/- 0.4 (stat.) +/- 0.7 (sys.) +/- 0.6 (theor.)) x 10^{-8}. We compare this result with predictions from chiral perturbation theory and estimates based on the decay K+ --> pi+ e+ e-.

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Observation of the Decay K+ --> pi+ mu+ mu-

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