Quark-lepton symmetry in five dimensions

Quark-Lepton Symmetry In Five Dimensions

We construct a complete five dimensional Quark-Lepton symmetric model, with all fields propagating in the bulk. The extra dimension forms an S1/Z2 × Z 2 orbifold with the zero mode fermions corresponding to standard model quarks localised at one fixed point. Zero modes corresponding to left(right)-chiral leptons are localised at (near) the other fixed point. This localisation pattern is motivat...

Quark-lepton Symmetry and Complementarity

New Issues in Quark-lepton Symmetry

Two models incorporating different forms of spontaneously broken quark-lepton symmetry are discussed. Both models are constructed so that quark-lepton symmetry can be broken at as low an energy scale as phenomenology allows, thus maximising their testability. The first model uses the Pati-Salam gauge group SU(4)⊗SU(2) L ⊗SU(2) R. The main analysis presented here concerns large threshold correct...

Purd-th-92-14 Quark-lepton Symmetry

Quark-lepton symmetric models are a class of gauge theories motivated by the similarities between the quarks and leptons. In these models the gauge group of the standard model is extended to include a “color” group for the leptons. Consequently, the quarks and leptons can then be related by a Z2 discrete quark-lepton symmetry which is spontaneously broken by the vacuum. Models utilizing quarkle...

Realistic Quark and Lepton Masses Through SO(10) Symmetry

In a recent paper a model of quark and lepton masses was proposed. Without any family symmetries almost all the qualitative and quantitative features of the quark and lepton masses and KobayashiMaskawa mixing angles are explained, primarily as consequences of various aspects of SO(10) symmetry. Here the model is discussed in much greater detail. The threefold mass hierarchy as well as the relat...