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We present the properties of 105 events of the form e + + e-~ e ± + ~t; + missing energy, in which no other charged particles or photons are detected. The simplest hypothesis compatible With all the data is that these events come from the production of a pair of heavy leptons, the mass of the lepton being in the range 1.6 to 2.0 GeV/c 2 In a prev!ous letter(More)
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