Limit on the branching ratio of KL→π0e+e-

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

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We report the results of a search for the decay KL→π0e+e- conducted by E799 at Fermilab. The largest contribution to this decay mode is expected to be CP violating. Observations of this decay could either confirm the standard model mechanisms for CP violation or point to physics beyond the standard model. No such events were seen in our search. The 90% confidence level upper limit is determined to be B(KL→π0e+e-)<4.3×10-9.

Original languageEnglish (US)
Pages (from-to)3918-3921
Number of pages4
JournalPhysical review letters
Issue number24
StatePublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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