SEARCH FOR HEAVY NEUTRAL LEPTONS IN e+e - ANNIHILATIONS AT 29 GeV

Abstract A search was made in 29 GeV e + e − annihilations for heavy, neutral leptons decaying to e ± X ∓ (ν), where X is a muon or charged meson. Six events with isolated e ± X ∓ pairs were found for an intergrated luminosity of 106 pb −1 . The expected background is 5.5 ± 2.2 events. Limits on σ s B depend on mass and range from 8 to 20 × 10 −5 nb.