Early unification and the Weinberg angle in the SU(4)4 grand unified model

Details Early unification and the Weinberg angle in the SU(4)4 grand unified model Early unification and the Weinberg angle in the SU(4)4 grand unified model

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983nuphb.218..423i&link_type=abstract

Nuclear Physics B, Volume 218, Issue 2, p. 423-444.

Physics

Nuclear Physics

Scientific paper

In the framework of the grand unified gauge group SU(4)4 we discuss possibilities to reconcile the low unification scale (105-107 GeV) with the acceptable value of sin2 θw. We consider various specific models which differ by the values of the intermediate mass scale, the choice of the fermion multiplets and by the embedding of the electroweak group SU(2) into SU(4)4. The class of theories with early unification and correct sin2 θw is constructed. They all predict new non-sequential fermions which are SU(2)L,R singlets and have unconventional electric charges. Cosmological implications of such theories are discussed and it is argued that new particles may well account for the positive results of searches for fractional charge in terrestrial matter.

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