Quarks and Leptons Beyond the Third Generation

  title={Quarks and Leptons Beyond the Third Generation},
  author={Paul H. Frampton and Phạm Quang Hưng and Marc A. Sher},
  journal={Physics Reports},
We consider extensions of the standard model with fourth generation fermions (SM4) in which extra symmetries are introduced such that the transitions between the fourth generation fermions and the
Implications of gauge-mediated supersymmetry breaking with vector-like quarks and a ~125 GeV Higgs boson
We investigate the implications of models that achieve a Standard Model-like Higgs boson of mass near 125 GeV by introducing additional TeV-scale supermultiplets in the vector-like 10+\bar{10}
Beautiful mirrors and precision electroweak data
The standard model (SM) with a light Higgs boson provides a very good description of the precision electroweak observable data coming from the CERN LEP, SLD and Fermilab Tevatron experiments. Most of
Flavor-changing interactions with singlet quarks and their implications for the LHC
We investigate the flavor-changing interactions in an extension of the standard model with singlet quarks and singlet Higgs, which are induced by the mixing between the ordinary quarks and the
Long lived fourth generation and the Higgs
A chiral fourth generation is a simple and well motivated extension of the standard model, and has important consequences for Higgs phenomenology. Here we consider a scenario where the fourth
Beautiful mirrors, unification of couplings, and collider phenomenology
The standard model provides an excellent description of the observables measured at high energy lepton and hadron colliders. However, measurements of the forward-backward asymmetry of the bottom


Structure of exotic generations.
Theoretical and phenomenological aspects of nonstandard multiplets of anomaly-free fermions (exotic generations) are examined and it is shown that it is possible that some of the known members of the incomplete third generation may actually be part of a triplet family, rather than a standard doublet family.
Is the t Quark Responsible for the Mass of W and Z Bosons
Based on the dynamical model having a large anomalous dimension γm≃2, we propose that the t quark condensate is responsible for the mass of W and Z bosons within the framework of the
Electroweak symmetry breaking by fourth-generation condensates and the neutrino spectrum.
A dynamical generalization of the seesaw mechanism is proposed based upon the BCS theory in which a neutrino condensate gives rise to right-handed-neutrino Majorana masses and all associated spin-zero bosons are composite.