Measurements of the decay KL → e+e-μ+μ-

A. Alavi-Harati, T. Alexopoulos, M. Arenton, K. Arisaka, R. F. Barbosa, A. R. Barker, M. Barrio, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, C. Bown, S. Bright, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, R. FordA. Glazov, A. Golossanov, P. Gouffon, J. Graham, J. Hamm, K. Hanagaki, Y. B. Hsiung, H. Huang, V. Jejer, D. A. Jensen, R. Kessler, H. G.E. Kobrak, K. Kotera, J. LaDue, N. Lai, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, V. Prasad, X. R. Qi, B. Quinn, E. J. Ramberg, R. E. Ray, E. Santos, K. Senyo, P. Shanahan, J. Shields, W. Slater, N. Solomey, E. C. Swallow, S. A. Taegar, R. J. Tesarek, P. A. Toale, A. Tripathi, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, R. F. Zukanovich

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25 Scopus citations


Several 132 KL → e+e- μ+ μ- events were observed from the 1997 and 1999 runs of the KTeV experiments, with an estimated background of 0.8 events. In the first measurement of the parameter α using this decay mode, it was found that α=-1.59±0.37. No evidence was found for CP-violating contributions to the KLγ*γ* interaction.

Original languageEnglish (US)
Article number141801
Pages (from-to)141801/1-141801/5
JournalPhysical review letters
Issue number14
StatePublished - Apr 11 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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