Phys. Rev. Lett. 100, 131803 (2008) [5 pages]Search for Lepton-Flavor-Violating Decays of the Neutral KaonReceived 21 November 2007; published 4 April 2008 The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the KL meson in three decay modes. We observe no events in the signal region for any of the modes studied, and we set the following upper limits for their branching ratios at the 90% C.L.: BR(KL→π0μ±e∓)<7.6×10-11; BR(KL→π0π0μ±e∓)<1.7×10-10; BR(π0→μ±e∓)<3.6×10-10. This result represents a factor of 82 improvement in the branching ratio limit for KL→π0μ±e∓ and is the first reported limit for KL→π0π0μ±e∓. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.131803
DOI:
10.1103/PhysRevLett.100.131803
PACS:
13.20.Eb, 11.30.Fs
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