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

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

1997-08-07

arxiv.org/abs/hep-ex/9708012v2

Phys.Rev.Lett.79:4756-4759,1997

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevLett.79.4756

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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