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Observation of the Decay K^+ --> pi^+ gamma gamma

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arxiv hep-ex/9708011 v2 pith:ASYUGYNR submitted 1997-08-08 hep-ex

E787 Collaboration: P. Kitching , T. Nakano , M. Rozon , R. Soluk , S. Adler , M.S. Atiya , I-H. Chiang , J.S. Frank
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J.S. Haggerty T.F. Kycia K. K. Li L. S. Littenberg A. Sambamurti A. Stevens R. C. Strand C. Witzig W. C. Louis D. S. Akerib M. Ardebili M. Convery M. M. Ito D. R. Marlow R. A. McPherson P. D. Meyers M. A. Selen F. C. Shoemaker A. J. S. Smith E. W. Blackmore D. A. Bryman L. Felawka A. Konaka Y. Kuno J. A. Macdonald T. Numao P. Padley J.-M. Poutissou R. Poutissou J. Roy A. S. Turcot
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The first observation of the decay K^+ --> pi^+ gamma gamma is reported. A total of 31 events was observed with an estimated background of 5.1 +- 3.3 events in the pi+ momentum range from 100 MeV/c to 180 MeV/c. The corresponding partial branching ratio, B(K+ -> pi+ gamma gamma, 100 MeV/c < P_pi^+ < 180 MeV/c), is (6.0 +- 1.5 (stat) +- 0.7 (sys)) x 10^{-7}. No K^+ --> pi^+ gamma gamma decay was observed in the pi^+ momentum region greater than 215 MeV/c. The observed pi^+ momentum spectrum is compared with the predictions of chiral perturbation theory.

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