Searches for unstable neutral and charged heavy leptons, N and \rmL^±, and for excited
states of neutral and charged leptons, ν^*, \rme^*, μ^*, and τ^*, have been performed in …

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 …

Extensive searches for evidence of compositeness of quarks and leptons have been made
in the complete set of ALEPH data from LEP running at the Z peak. These include searches …

Photonic events with large missing energy have been observed in e^+e^- collisions at
centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP …

A search for charged excited leptons decaying into a lepton and a photon has been
performed using approximately 680 pb− 1 of e+ e− collision data collected by the OPAL …

If quarks are composite particles, then excited states are expected to play a rôle in the Large
Hadron Collider phenomena. Concentrating on virtual effects, and using a large part of the …

We have searched for unstable neutral and charged heavy leptons, N and L±, and for
excited states of neutral and charged leptons, ν* e*, μ* and τ*, in e+ e− collisions at centre-of …

Using the ZEUS detector at HERA, we have searched for heavy excited states of electrons,
neutrinos, and quarks in e+ p collisions at a center-of-mass energy of 300 GeV. With an …

We explore the potential of the Next Linear Collider, operating in the e γ mode, to
disentangle new physics scenarios in single W production. We study the effects related to …

We study the effects induced by excited leptons on the leptonic τ decay at the one loop level.
Using a general effective Lagrangian approach to describe the couplings of the excited …