Search for Unstable Heavy and Excited Leptons at LEP2

Details Search for Unstable Heavy and Excited Leptons at LEP2 Search for Unstable Heavy and Excited Leptons at LEP2

2000-01-24

arxiv.org/abs/hep-ex/0001056v1

Eur.Phys.J.C14:73-84,2000

Physics

High Energy Physics

High Energy Physics - Experiment

27 pages, 8 figures, submitted to Eur.Phys. J. C

Scientific paper

10.1007/s100520050734

Searches for unstable neutral and charged heavy leptons, N and L+-, and for excited states of neutral and charged leptons, nu*, e*, mu*, and tau*, have been performed in e+e- collisions using data collected by the OPAL detector at LEP. The data analysed correspond to an integrated luminosity of about 58pb-1 at a centre-of-mass energy of 183GeV, and about 10pb-1 each at 161GeV and 172GeV. No evidence for new particles was found. Lower limits on the masses of unstable heavy and excited leptons are derived. From the analysis of charged-current, neutral-current, and photonic decays of singly produced excited leptons, upper limits are determined for the ratio of the coupling to the compositeness scale, f/Lambda, for masses up to the kinematic limit. For excited leptons, the limits are established independently of the relative values of the coupling constants f and f'.

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