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Quark-lepton families in a model with SU(5)xSU(3) symmetry

Journal Article · · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
OSTI ID:5540176
;

The running (from the SU(5)xSU(3) symmetry limit ..mu..approx.10/sup 15/ GeV to our energies ..mu.. = 1--10 GeV) masses of the quarks d, s, and b and the Kobayashi-Maskawa mixing angles theta/sub 1/, theta/sub 2/, and theta/sub 3/ are calculated in a grand unification model with a ''horizontal'' SU(3) symmetry between various quark-leptonic generations. Two versions of the model are treated: model A with three quark-leptonic generations (according to the standard SU(5)) and model B with six generations (as predicted by the SU(8) symmetry with unification of all quark-leptonic flavors). Both models agree with the data on the masses of the lower quarks and on the Cabibbo angle theta/sub C/ = theta/sub 1/roughly-equal(m/sub d//m/sub s/)/sup 1/2/. These models predict a very small value for the angle theta/sub 3/approx.10/sup -3/--10/sup -2/ and a rather large CP phase deltaapprox.0.1. These predictions should lead on the one hand to an essential suppression of weak (b ..-->.. u) transitions and on the other hand to a considerable charge asymmetry in the decays of the (B/sup 0/--B-bar/sup 0/) system. The models predict also the mass of the t quark: m/sub t/ = 150--200 GeV (model A) and m/sub t/ = 20-40 GeV (model B) for a c-quark mass m/sub c/ = 1.5--1.3 GeV.

Research Organization:
Institute of Physics, Georgian Academy of Sciences
OSTI ID:
5540176
Journal Information:
Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 37:4; ISSN SJNCA
Country of Publication:
United States
Language:
English

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Related Subjects

645301* -- High Energy Physics-- Particle Invariance Principles & Symmetries-- General-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
LIE GROUPS
MASS
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
QUARKS
SU GROUPS
SU-3 GROUPS
SU-5 GROUPS
SYMMETRY GROUPS
UNIFIED GAUGE MODELS