Study of the decay KL0e()

G. Makoff, A. R. Barker, R. A. Briere, L. K. Gibbons, V. Papadimitriou, J. R. Patterson, S. V. Somalwar, Y. W. Wah, B. Winstein, R. Winston, M. Woods, H. Yamamoto, E. C. Swallow, G. J. Bock, R. Coleman, J. Enagonio, Y. B. Hsiung, E. Ramberg, K. Stanfield, R. TschirhartT. Yamanaka, G. D. Gollin, M. Karlsson, K. Okamitsu, P. Debu, B. Peyaud, R. Turlay, B. Vallage

Research output: Contribution to journalArticlepeer-review


We have observed 72915 KL0e() decays in the data set collected in the 19871988 run of Fermilab experiment E731. We found the Ke4 branching ratio to be [5.160.20(stat)0.22(sys)]×10-5. We also performed the first measurement of the form factors parametrizing the decay. Our branching ratio result agrees with a prediction using a vector-meson-exchange model. An interpretation of the data in terms of chiral perturbation theory implies a value L3=(3.40.4) ×10-3 in the O(p4) chiral Lagrangian.

Original languageEnglish (US)
Pages (from-to)1591-1594
Number of pages4
JournalPhysical review letters
Issue number11
StatePublished - 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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