Article

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

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The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637, USA.
(Impact Factor: 7.51). 04/2008; 100(13):131803. DOI: 10.1103/PhysRevLett.100.131803
Source: PubMed

ABSTRACT

The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the K(L) 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(K(L) --> pi(0) micro(+/-) e(-/+)) <7.6 x 10(-11); BR(K(L) --> pi(0)pi(0) micro(+/-) e(-/+)) <1.7 x 10(-10); BR(pi(0) --> micro(+/-) e(-/+)) <3.6 x 10(-10). This result represents a factor of 82 improvement in the branching ratio limit for K(L) --> pi(0) micro(+/-) e(-/+) and is the first reported limit for K(L) --> pi(0)pi(0) micro(+/-) e(-/+).

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Available from: E. C. Swallow, Apr 07, 2014
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ABSTRACT: We provide a review of the status of experimental searches for lepton flavor violation involving electrons, muons, and tau leptons. Future experimental programs are discussed and placed in the context of theories beyond the standard model.
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ABSTRACT: The KTeV collaboration at Fermi National Accelerator Laboratory has recently completed searches for and measurements of several decay modes of the neutral kaon and pion. These include new searches for lepton flavor violating decays (which have not been seen), and a new study of the parity properties of the decay pi^0 -> e^+e^-e^+e^-.
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ABSTRACT: This is a brief summary of the theoretical interest and recent experimental progress on K+ → π+VV̄, KL0 → π0vv̄, KL0 → π0e+e-, KL0 → π0 μ+μ-, as well as kaonlepton-flavor-violating (LFV) semileptonic decays. Experiment E949 published a final result of the search for rare K+ → p+vv decay. The branching ratio was measured to be (1.73-1.05+1.15) × 10-10. The central value is twice that of the SM prediction, but still consistent within errors. Experiment E391a presented a new upper limit for the decay of KL0 → π0vv- which is < 6.7 × 10-8 C.L. = 90%. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
No preview · Article · Jan 2009