Phys. Rev. Lett. 79, 4079–4082 (1997)Observation of the Decay K+→π+γγReceived 23 July 1997; published in the issue dated 24 November 1997 The first observation of the decay K+→π+γγ is reported. A total of 31 events was observed with an estimated background of 5.1±3.3 events in the π+ momentum range from 100 to 180 MeV/c. The corresponding partial branching ratio, B(K+→π+γγ,100MeV/c<Pπ+<180MeV/c), is [6.0±1.5(stat)±0.7(syst)]×10-7. No K+→π+γγ decay was observed in the π+ momentum region greater than 215 MeV/c. The observed π+ momentum spectrum is compared with the predictions of chiral perturbation theory. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.4079
DOI:
10.1103/PhysRevLett.79.4079
PACS:
13.20.Eb, 12.39.Fe, 13.40.Hq
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