Measurement of the branching ratio and a study of CP for the leptonic decay KL?e+e-e+e-

P. Gu, P. Haas, W. P. Hogan, S. K. Kim, J. N. Matthews, S. S. Myung, S. Schnetzer, G. B. Thomson, Y. Zou, K. Arisaka, D. Roberts, W. Slater, M. Weaver, R. A. Briere, E. Cheu, D. A. Harris, K. S. McFarland, A. Roodman, B. Schwingenheuer, S. V. SomalwarY. W. Wah, B. Winstein, R. Winston, A. R. Barker, E. C. Swallow, G. J. Bock, R. Coleman, M. Crisler, J. Enagonio, R. Ford, Y. B. Hsiung, D. A. Jensen, E. Ramberg, R. Tschirhart, E. M. Collins, G. D. Gollin, T. Nakaya, T. Yamanaka

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We have determined the branching ratio of KL?e+e-e+e- based on the observation of 27 four-electron final state events with 0.36 estimated background event, B(KL?e+e-e+e-) =[3.960.78(stat)0.32(syst)]×10-8. Using the distribution of the angle between the e+e- pair decay planes, we find that the decay proceeds predominantly through the K2(CP=-1) state.

Original languageEnglish (US)
Pages (from-to)3000-3003
Number of pages4
JournalPhysical review letters
Issue number19
StatePublished - 1994

ASJC Scopus subject areas

  • General Physics and Astronomy


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