We discuss the possibility of same-sign dileptons as a signature for Majorana neutrinos. The production mechanism is given by a single heavy neutrino production and decay pp −→ l ± N X −→ l ± l ± X ′ . Cross section and distributions are presented for the LHC energies.
We investigate the possibility of producing new heavy leptons as suggested by some grand unified theories and superstring-inspired models. For these models the production of a single heavy lepton is shown to be more relevant than pair production. We present a study of cross sections and distributions that could, in principle, differentiate models for new leptons at Fermilab Tevatron and CERN LHC energies.
The 3-3-1 electroweak model is the simplest chiral extension of the standard model which predicts single and double charged bileptons and exotic quarks carrying -4/3 and 5/3 units of the positron charge. In this paper we study the possibilities of the production and decay of one of these exotic quarks at CERN LEPII-LHC collider. For typical vector bilepton, exotic quark masses and mixing angles we obtained between 20 and 750 events per year. Angular distributions are also presented.
The production and decay of exotic leptons are discussed in the context of the vector singlet, vector doublet and fermion mirror-fermion models, at c.m. energies √ s = 190GeV (LEP II) and √ s = 500GeV (NLC). The model dependence of total cross sections and kinematic distributions at these energies is shown to be weak for these three extended models, indicating that it would be difficult to establish which of them is best fit to describe the underlying new physics, should exotic leptons be detected. We suggest that, in order to resolve this difficulty, one should measure the angular distributions of single exotic leptons in longitudinally polarized e + e − collisions.
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