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

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arxiv hep-ex/9708012 v2 pith:U2EKDRQQ submitted 1997-08-07 hep-ex

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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keywords decaygammabranchingchiralcompareestimatesmeasuredobservation
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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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