3 papers
hep-ph1999
3-3-1 exotic quark search at CERN LEPII-LHC
Y. A. Coutinho, P. P. Queiróz Filho, M. D. Tonasse
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…
hep-ph1997
Same-sign dileptons as a signature for heavy Majorana neutrinos in hadron-hadron collisions
F. M. L. Almeida, Y. A. Coutinho, J. A. Martins Simões +2
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 proton-pr…
hep-ph1994
Single Heavy Lepton Production in High Energy Electron-Positron Collisions
F. M. L. Almeida, J. H. Lopes, J. A. Martins Simões +2
The production and decay of exotic leptons are discussed in the context of the vector singlet, vector doublet and fer\-mion mirror-fer\-mion models, at c.m. energies $\sqrt{s}=190G…