First Observation Of The Decay K-L -> Pi(0)E(+)E(-)Gamma

A. Alavi-Harati,T. Alexopoulos,M. Arenton,K. Arisaka,S. Averitte,A. R. Barker, L. Bellantoni,A. Bellavance,J. Belz,R. Ben-David,D. R. Bergman,E. Blucher,G. J. Bock,C. Bown,S. Bright,E. Cheu,S. Childress,R. Coleman,M. D. Corcoran,G. Corti,B. Cox,M. B. Crisler,A. R. Erwin,R. Ford,A. Glazov,A. Golossanov,G. Graham,J. Graham, K. Hagan, E. Halkiadakis,J. Hamm,K. Hanagaki,S. Hidaka,Y. B. Hsiung,V. Jejer,D. A. Jensen, R. Kessler, H. G. E. Kobrak,J. LaDue, A. Lath, A. Ledovskoy,P. L. McBride,P. Mikelsons,E. Monnier,T. Nakaya,K. S. Nelson,H. Nguyen,V. O'Dell,M. Pang,R. Pordes,V. Prasad,B. Quinn,E. J. Ramberg,R. E. Ray, A. Roodman,M. Sadamoto, S. Schnetzer,K. Senyo,P. Shanahan,P. S. Shawhan,J. Shields,W. Slater,N. Solomey,S. V. Somalwar,R. L. Stone,I. Suzuki,E. C. Swallow,S. A. Taegar,R. J. Tesarek,G. B. Thomson,P. A. Toale,A. Tripathi,R. Tschirhart,S. E. Turner,T. Uchizawa,Y. W. Wah,J. Wang,H. B. White,J. Whitmore,B. Winstein, R. Winston, T. Yamanaka,E. D. Zimmerman

PHYSICAL REVIEW LETTERS（2001）

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摘要

We report on the first observation of the decay K-L --> pi (0)e(+)e(-)gamma by the KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an estimated background of 3.6 +/- 1.1 events, we measure the K-L --> pi (0)e(+)e(-)gamma branching ratio to be (2.34 +/- 0.35 +/- 0.13) x 10(-8). Our data agree with recent O(p(6)) calculations in chiral perturbation theory that include contributions from vector meson exchange through the parameter a(V). A fit was made to the K-L --> pi (0)e(+)e(-)gamma data for a(V) with the result -0.67 +/- 0.21 +/- 0.12, which is consistent with previous results from KTeV.

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