Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-20
Phys.Rev. D74 (2006) 033005
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, minor changes. To appear in Phys. Rev.D
Scientific paper
10.1103/PhysRevD.74.033005
The idea of quark-lepton universality at high energies has recently been explored in unified theories based upon the quartification gauge group SU(3)^4. These schemes encompass a quark-lepton exchange symmetry that results upon the introduction of leptonic colour. It has been demonstrated that in models in which the quartification gauge symmetry is broken down to the standard model gauge group, gauge coupling constant unification can be achieved, and there is no unique scenario. The same is also true when the leptonic colour gauge group is only partially broken, leaving a remnant SU(2)_\ell symmetry at the standard model level. Here we perform an analysis of the neutrino mass spectrum of such models. We show that these models do not naturally generate small Majorana neutrino masses, thus correcting an error in our earlier quartification paper, but with the addition of one singlet neutral fermion per family there is a realisation of see-saw suppressed masses for the neutrinos. We also show that these schemes are consistent with proton decay.
Demaria Alison
Low Catherine I.
Volkas Raymond R.
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