Search for Excited Leptons in E(+)E(-) Collisions at Root S=161 Gev

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Physics letters B（1997）

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摘要
A search with the DELPHI detector at LEP for excited leptons (e∗, μ∗, τ∗ and ν∗) decaying through γ, W or Z transitions is reported. The data used correspond to an integrated luminosity of 10 pb−1 at an e+e− centre-of-mass energy of 161 GeV. The search for pair produced excited leptons established the limits me∗ > 79.6 GeV/c2, mμ∗ > 79.6 GeV/c2, mτ∗ > 79.4 GeV/c2 and mν∗ > 56.4 GeV/c2 at 95% confidence level, assuming that the SU(2) and U(1) couplings of excited leptons are in the same ratio as for normal leptons and considering both left and right-handed components. Limits corresponding to other assumptions are also given. The search for single excited lepton production established upper limits on the ratio λmℓ∗ of the coupling of the excited lepton to its mass.
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