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

Abstract

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-.

arXiv comment9 pages, LaTeX, 2 Postscript figures. Version to be published in PRL

References in corpus (2)

• Rare Kaon Decays in the $1/N_c$-Expansion
• Reanalysis of the decay K_L -> pi0 e+ e-

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