Abstract
The characteristics of the Ke4 and Kμ4 modes of K-meson decay have been studied. Isotopic spin relationships following from the hypothesis of aT=1/2 strangeness-nonconserving current are discussed. The decay rates have been estimated in several ways, which agree in predicting a K e4 + /K e3 + branching ratio between 10−3 and 10−4, so that the observation of K e4 + events may be expected in the near future. The K μ4 + rate is expected to be at least an order of magnitude smaller than that for K e4 + mode of decay.
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