Quarks and Leptons Beyond the Third Generation

  title={Quarks and Leptons Beyond the Third Generation},
  author={P. Frampton and P. Q. Hưng and M. Sher},
  journal={Physics Reports},
Abstract The possibility of additional quarks and leptons beyond the three generations already established is discussed. The make-up of this Report is (1)  Introduction : the motivations for believing that the present litany of elementary fermions is not complete; (2)  quantum numbers : possible assignments for additional fermions; (3)  masses and mixing angles : mass limits from precision electroweak data, vacuum stability and perturbative gauge unification; empirical constraints on mixing… Expand