QUARK-LEPTON SYMMETRY AND QUARTIFICATION 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 Quartification

We propose that quarks and leptons are interchangeable entities in the high-energy limit. This naturally results in the extension of [SU(3)] trinification to [SU(3)] quartification. In addition to the unbroken color SU(3)q of quarks, there is now also a color SU(3)l of leptons which reduces to an unbroken SU(2)l. We discuss the natural occurrence of SU(2)l doublets at the TeV energy scale, whic...

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...