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

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

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

Authors

Description

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