Abstract
A search for μ+→e++e−+e+ was conducted using counter techniques. The number of mesons stopped was 109; when multiplied by the efficiency for detecting a three-electron decay, the number became 1.7·107. Five events were seen and are probably due to the decay mode μ+→e++e−+e++ν+\(\bar \nu \). Even assuming them to be due to μ+→e++e−+e+, a new upper limit of 5·10−7 is set for the branching ratio of this mode.
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