A SEARCH FOR NEW HEAVY-LEPTONS AT PETRA

Abstract Results are presented on a search for new heavy leptons, a sequential heavy lepton L ± , and an electron-type neutral heavy lepton E 0 , using the JADE detector at PETRA. No evidence for either of these particles was observed. A lower mass limit for the L ± is determined to be 18.0 GeV/ c 2 at 95% CL. Lower mass limits for the E 0 are 24.5 GeV/ c 2 and 22.5 GeV/ c 2 , in the case of universal V + A and V − A coupling at the W-e-E vertex, respectively.