Search for excited leptons at LEP

Excited leptons have been searched for using data recorded by the OPAL detector at LEP. No evidence for such particles has been found. From the study of e+e− → ℓ+ℓ−γγ events, lower limits on the masses of spin-12 excited leptons are found to be 44.9 GeV at 95% confidence level. From the study of e+e− →ℓ+ℓ−γ events, upper limits on their couplings are set up to ℓ∗ masses close to the mass of the Z0 boson.