Measurement Of The Branching Fraction Of The Decay K-L ->Pi(+)Pi(-)E(+)E(-)

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

PHYSICAL REVIEW LETTERS（1998）

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摘要

We report the first branching fraction measurement of the decay K-L --> pi(+)pi(-) e(+)e(-). With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(K-L --> pi(+)pi(-) e(+)e(-)) = [3.2 +/- 0.6(stat) +/- 0.4(syst)] x 10(-7). This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung.

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