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Observation of the decay mode KL -> pi+ pi- e+ e-

Y. Takeuchi, Y. Hemmi, H. Kurashige, Y. Matono, K. Murakami, T. Nomura, H. Sakamoto, N. Sasao, M. Suehiro, Y. Fukushima, Y. Ikegami, T. T. Nakamura, T. Taniguchi, M. Asai

hep-exarXiv:hep-ex/9810018

Abstract

We report on results of an experimental search for the KL -> pi+ pi- e+ e- decay mode. We found 13.5 +- 4.0 events and determined its branching ratio to be (4.4 +- 1.3(stat) +- 0.5(syst))*10-7. The result agrees well with the theoretical prediction.

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