Phys. Rev. Lett. 81, 4309–4312 (1998)First Observation of the Rare Decay Mode KL0→e+e-Received 1 September 1998; published in the issue dated 16 November 1998 In an experiment designed to search for and study very rare two-body decay modes of the KL0, we have observed four examples of the decay KL0→e+e-, where the expected background is 0.17±0.10 events. This observation translates into a branching fraction of 8.7-4.1+5.7×10-12, consistent with recent theoretical predictions. This result represents by far the smallest branching fraction yet measured in particle physics. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.4309
DOI:
10.1103/PhysRevLett.81.4309
PACS:
13.20.Eb, 12.15.Mm
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