The most sensitive experiment to date to search for the muon and electron lepton number violating decay K 0 L ! m 6 e 7 has detected no events consistent with this process. Based on this result, the 90% confidence level upper limit on the branching fraction is B͑K 0 L ! m 6 e 7 ͒ , 4.7 3 10 212 . [S0031-9007(98)07985-X]
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