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We report on results of a search for the decay mode K L ->π 0 γe + e - conducted by the E162 experiment at KEK. We observed no events and set a 90% confidence level upper limit of Br(K L ->π 0 γe + e - )<7.1x10 -7 for its branching ratio. This is the first published experimental result on this decay mode.
We report on results of an experimental search for the K L ->π + π - 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.))x10 -7 . The result agrees well with the theoretical prediction.
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