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.
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