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[en] The Fermilab E799 Collaboration has carried out a search for the rare decay π0→e+e- using π0's produced from KL→π0π0π0 decays in flight. We observe a signal of nine events with an e+e- mass close to the π0 mass where only one event is predicted from other known processes. From this, we measure B(π0→e+e-,(mee/mπ0)2>0.95) =[7.6-2.8+3.9(stat)±0.5(syst)]x10-8, over and above the contribution from π0 Dalitz decays. Correcting for radiative effects, we find this result consistent with theoretical expectations from standard-model processes
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