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We have searched for a heavy charged lepton with an associated neutrino of nearly the same mass in e e annihilation data taken with the Mark II detector at a center-of-mass energy of 29 GeV. In order to suppress contamination from conventional two-photon reactions, this analysis uses a novel, radiative-tagging technique. Requiring the presence of an isolated, energetic photon allows a search for lepton doublets with mass splittings smaller than that previously accessible to experiment. Nodoi:10.1103/physrevd.42.1 pmid:10012691 fatcat:2xrmutbdtfc23asn2iql5wzfhy