Petite unification of quarks and leptons

Journal Article · Mon Feb 01 00:00:00 EST 1982 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.25.805· OSTI ID:5521473

Hung, P Q; Buras, A J; Bjorken, J D

A general discussion of a quark-lepton unification characterized by the gauge group G/sub S/xG/sub W/ with two coupling constants g/sub S/ and g/sub W/ and by the unification mass scale M = 10/sup 5plus-or-minus1/ GeV is presented. The choice of G/sub W/ is quite restricted by the measured value of sin/sup 2/theta/sub W/. The minimal model of such a unification turns out to be SU(4)/sub PS/xSU(2)/sub L/xSU(2)/sub R/xSU(2)/sub L/'xSU(2)/sub R/', where the first three factors constitute the well-known Pati-Salam group. The presence of SU(2)/sub L/'xSU(2)/sub R/' is required by the measured value of sin/sup 2/theta/sub W/ and it implies the existence of mirror fermions whose masses may range from 20--30 GeV to a few TeV. The lightest mirror femion might be relatively long lived when compared to an ordinary sequential heavy fermion. The model accommodating all known quark and lepton generations gives the correct sin/sup 2/theta/sub W/roughly-equal0.22 and at the same time can be made consistent with the experimental bounds on rare transitions induced by leptoquark exchanges.

• Research Organization: Fermi National Accelerator Laboratory, Batavia, Illinois 60510
• OSTI ID: 5521473
• Journal Information: Phys. Rev. D; (United States), Vol. 25:3
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
LEPTONS
COUPLING CONSTANTS
QUARKS
RENORMALIZATION
SU-2 GROUPS
SYMMETRY BREAKING
UNIFIED GAUGE MODELS
ELEMENTARY PARTICLES
FERMIONS
LIE GROUPS
MATHEMATICAL MODELS
PARTICLE MODELS
POSTULATED PARTICLES
SU GROUPS
SYMMETRY GROUPS
645201* - High Energy Physics- Particle Interactions & Properties-Theoretical- General & Scattering Theory