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

Abstract

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.

arXiv comment4 pages, 6 figures, Revtex4. Correction to figure and minor text changes

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• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Radiative Semileptonic Kaon Decays
• A new measurement of K+(e4) decay and the s-wave pi-pi-scattering length a00
• High statistics measurement of Ke4 decay properties
• Experimental Study of the Radiative Decays K+ -> mu+ nu e+e- and K+ -> e+ nu e+e-
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• New Physics Searches at Kaon and Hyperon Factories