Eur. Phys. J. C (2006) 46: 277-293
https://doi.org/10.1140/epjc/s2006-02501-3

Experimental Physics

Search for excited leptons in e⁺e^- collisions at =189–209 GeV

Received: 11 January 2005
Revised: 19 January 2006
Published online: 31 March 2006

Abstract

A search for excited lepton production in e⁺e^- collisions was performed using the data collected by the DELPHI detector at LEP at centre-of-mass energies ranging from 189 GeV to 209 GeV, corresponding to an integrated luminosity of approximately 600 pb^-1. No evidence for excited lepton production was found. In searches for pair-produced excited leptons, lower mass limits were established in the range 94–103 GeV/c², depending on the channel and model assumptions. In searches for singly-produced excited leptons, upper limits on the parameter f/Λ were established as a function of the mass.