Search for composite and exotic fermions at LEP 2

Details Search for composite and exotic fermions at LEP 2 Search for composite and exotic fermions at LEP 2

1998-11-05

arxiv.org/abs/hep-ex/9811005v3

Eur.Phys.J.C8:41-58,1999

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1007/s100529901074

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb^{-1} at an e^+e^- centre-of-mass energy of 183 GeV and about 20 pb^{-1} equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/c^2 and 90 GeV/c^2, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermion

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