标题： 在$^+$e$^-$湮灭过程中寻找重的中性与带电轻子，在$\sqrt{s}$ = 183 和 189 GeV 时 显示英文标题

标题： Search for Heavy Neutral and Charged Leptons in e$^+$e$^-$ Annihilation at $\sqrt{s}$ = 183 and 189 GeV

摘要： 对不稳定的中性及带电重轻子以及稳定的带电重轻子进行了搜索，在质心系能量$\sqrt{s}$ = 183 和 189 GeV 下使用 L3 探测器在 LEP 上进行。 未发现它们存在的证据。 我们排除了与电子、μ子或τ家族耦合的中性重轻子，对于质量低于 92.4、93.3 和 83.3 GeV 的狄拉克型中性重轻子，以及质量低于 81.8、84.1 和 73.5 GeV 的马约拉纳型中性重轻子。 对于关联中性重轻子质量的广泛范围，排除了质量低于 93.9 GeV 的不稳定带电重轻子。 如果不稳定带电重轻子衰变为轻中微子，我们排除了质量低于 92.4 GeV 的情况。 质量小于 93.5 GeV 的稳定带电重轻子的产生也被排除。 显示英文摘要

摘要： A search for unstable neutral and charged heavy leptons as well as for stable charged heavy leptons is performed at center-of-mass energies $\sqrt{s}$ = 183 and 189 GeV with the L3 detector at LEP. No evidence for their existence is found. We exclude neutral heavy leptons which couple to the electron, muon or tau family, of the Dirac type for masses below 92.4, 93.3 and 83.3 GeV, and of the Majorana type for masses below 81.8, 84.1 and 73.5 GeV, respectively. We exclude unstable charged heavy leptons for masses below 93.9 GeV for a wide range of the associated neutral heavy lepton mass. If the unstable charged heavy lepton decays to a light neutrino, we exclude masses below 92.4 GeV. The production of stable charged heavy leptons with mass less than 93.5 GeV is also excluded.