First Observation of the Rare Decay Mode K-long -> e+ e-

Details First Observation of the Rare Decay Mode K-long -> e+ e- First Observation of the Rare Decay Mode K-long -> e+ e-

1998-10-01

arxiv.org/abs/hep-ex/9810007v1

Phys.Rev.Lett.81:4309-4312,1998

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.81.4309

In an experiment designed to search for and study very rare two-body decay modes of the K-long, we have observed four examples of the decay K-long -> e+ e-, where the expected background is 0.17+-0.10 events. This observation translates into a branching fraction of 8.7^{+5.7}_{-4.1} X 10^{-12}, consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics.

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