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arxiv: hep-ex/0505011 · v3 · submitted 2005-05-06 · ✦ hep-ex

First observation of the decay K+ -> e+ nu mu+ mu-

H.Ma , R. Appel , G.S. Atoyan , B. Bassalleck , D.R. Bergman , N. Cheung , S. Dhawan , H. Do
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J. Egger S. Eilerts W. Herold V.V. Issakov H. Kaspar D.E. Kraus D.M. Lazarus P. Lichard J. Lowe J. Lozano W. Majid S. Pislak A.A. Poblaguev P. Rehak A. Sher J.A. Thompson P. Truoel M.E. Zeller (E865 collaboration)
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keywords decaymodelbackgroundbranchingbrookhavendominatederrorexperiment
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Experiment 865 at the Brookhaven AGS has observed the decay K^+ -> e^+ nu mu^+ mu^-. The branching ratio extracted is (1.72 +/- 0.37(stat) +/- 0.17(syst) +/- 0.19(model)) x 10^{-8} where the third term in the error results from the use of a model to extrapolate into a kinematic region dominated by background.

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