Branching Ratio Measurement Of The Decay K-L -> E(+)E(-)Mu(+)Mu(-)

A. Alavi-Harati, T. Alexopoulos,M. Arenton, K. Arisaka,S. Averitte,R. Barbosa,A. Barker, M. Barrio, 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, A. Glazov,A. Golossanov,G. Graham, J. Graham, K. Hagan, E. Halkiadakis,J. Hamm,K. Hanagaki,S. Hidaka,Y. Hsiung,V. Jejer,D. Jensen, R. Kessler, H. Kobrak,J. LaDue, A. Lath, A. Ledovskoy, P. McBride,P. Mikelsons,E. Monnier, T. Nakaya,K. Nelson, H. Nguyen, V. O'Dell,M. Pang,R. Pordes,V. Prasad,B. Quinn,X. Qi, E. Ramberg,R. Ray,A. Roodman,M. Sadamoto, S. Schnetzer,K. Senyo,P. Shanahan,P. Shawhan,J. Shields,W. Slater,N. Solomey, S. Somalwar,R. Stone,E. Swallow,S. Taegar,R. Tesarek,G. Thomson,P. Toale, A. Tripathi,R. Tschirhart,S. Turner, Y. Wah,J. Wang,H. White, J. Whitmore,B. Winstein, R. Winston, T. Yamanaka,E. Zimmerman

PHYSICAL REVIEW LETTERS（2001）

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摘要

We have collected a 43 event sample of the decay K-L --> e(+)e(-)mu (+)mu (-) with negligible backgrounds and measured its branching ratio to be (2.62 +/- 0.40 +/- 0.17) X 10(-9). We see no evidence for CP violation in this decay. In addition, we set the 90% confidence upper limit on the combined branching ratios for the lepton flavor violating decays K-L --> e(+/-)e(+/-)mu (-/+)mu (-/+) at B(K-L --> e(+/-)e(+/-)mu (-/+)mu (-/+)) less than or equal to 1.23 X 10(-10), assuming a uniform phase space distribution.

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