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

Abstract

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.

9 pages, 6 eps-figures, LaTeX2e, graphicx package, submitted to Physics Letters B

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