Phys. Rev. Lett. 79, 2204–2207 (1997)Evidence for the Decay K+ → π+νν̅Received 15 August 1997; published in the issue dated 22 September 1997 An event consistent with the signature expected for the rare kaon decay K+→π+νν̅ has been observed. In the pion momentum region examined, 211<P<230MeV/c, the backgrounds are estimated to contribute 0.08±0.03 events. If the event is due to K+→π+νν̅ , the branching ratio is 4.2-3.5+9.7×10-10. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.2204
DOI:
10.1103/PhysRevLett.79.2204
PACS:
13.20.Eb, 12.15.Hh, 14.80.Mz
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