DOI 10.1007/s100529901074
Search for composite and exotic fermions at LEP 2
The DELPHI Collaboration
P. Abreu21 - et al.
LIP, IST, FCUL - Av. Elias Garcia, 14-1o, P-1000 Lisboa Codex, Portugal
Received: 30 October 1998 / Published online: 1 March 1999
Abstract
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
48pb-1 at an centre-of-mass energy of
183GeV and about 20pb-1 equally shared between the
centre-of-mass energies of 172GeV and 161GeV. The search for
pair-produced new leptons establishes 95% confidence level mass
limits in the region between 70GeV/c2 and 90GeV/c2,
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 to its mass (
)as a function of the mass.
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