Search for Lepton-Flavor-Violating Decays of the Neutral Kaon

E. Abouzaid et al. (KTeV Collaboration)
Phys. Rev. Lett. 100, 131803 – Published 4 April 2008

Abstract

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(KLπ0μ±e)<7.6×1011; BR(KLπ0π0μ±e)<1.7×1010; BR(π0μ±e)<3.6×1010. This result represents a factor of 82 improvement in the branching ratio limit for KLπ0μ±e and is the first reported limit for KLπ0π0μ±e.

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  • Received 21 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.131803

©2008 American Physical Society

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Vol. 100, Iss. 13 — 4 April 2008

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