Observation of the decay mode K_L -> pi^+ pi^- e^+ e^-

Y. Takeuchi , Y. Hemmi , H. Kurashige , Y. Matono , K. Murakami , T. Nomura , H. Sakamoto , N. Sasao

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M. Suehiro Y. Fukushima Y. Ikegami T. T. Nakamura T. Taniguchi M. Asai

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classification ✦ hep-ex

keywords decaymodeagreesbranchingdeterminedeventsexperimentalfound

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We report on results of an experimental search for the K_L -> 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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Observation of the decay mode K_L -> pi^+ pi^- e^+ e^-

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