Implications of symmetry breaking and phenomenology for super-string based models with gauge symmetry SU(3)/sub C/ x SU(2)/sub L/ x SU(2) x U(1) x SU(2) x U(1) x U(1)'

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Int. J. Mod. Phys. A; (United States)

DOI:https://doi.org/10.1142/S0217751X8900008X· OSTI ID:5810737

McDonald, J

The authors discuss symmetry breaking and phenomenological aspects of rank 6 effective models in 4 dimensions, suggested by Calabi-Yau compactification of the heterotic E/sub 8/ x E/sub 8/ superstring, which have gauge group SU(3)/sub C/ x SU(2)/sub L/ x SU(2) x U(1)'. The simplest and most natural form of electroweak symmetry breaking for the softly broken effective SUSY theory is considered, and only those additions and alterations to the 27/sup 3/ based superpotential necessary to eliminate phenomenological problems are made. There are two physically distinct additional SU(2) factors, SU(2)/sub N/ and SU(2)/sub R/. The former has all gauge bosons electrically neutral, the latter both charged and neutral. The additional SU(2) symmetry implies that large Dirac neutrino masses must be eliminated by a see-saw mechanism requiring the introduction of an E/sub 6/ singlet per generation and an intermediate scale of symmetry breaking M/sub I/(/ge/10/sup 10/ GeV). The intermediate scale symmetry breaking together with the couplings involving E/sub 6/ singlets needed for the see-saw mechanism unambiguously determines the form of the superpotential describing physics at low scales /approx/ 1 TeV. All additional heavy charge -1/3 quarks and additional Higgs doublets have masses /approx/ 1 TeV. An additional U(1)/sub E/ remains unbroken down to the 1 TeV scale. The resulting effective theories have no U(1)/sub E/ mediated FCNC due to mixing of heavy and light charge -1/3 quarks. Some couplings must be eliminated in order to prevent rapid nucleon decay.

• Research Organization: Liverpool Univ. (UK). Dept. of Applied Mathematics and Theoretical Physics
• OSTI ID: 5810737
• Journal Information: Int. J. Mod. Phys. A; (United States), Journal Name: Int. J. Mod. Phys. A; (United States) Vol. 4:1; ISSN IMPAE
• Country of Publication: United States
• Language: English

Related Subjects

645203 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Weak Interactions & Properties
645300* -- High Energy Physics-- Particle Invariance Principles & Symmetries
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPACTIFICATION
COMPOSITE MODELS
DECAY
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
FOUR-DIMENSIONAL CALCULATIONS
GAUGE INVARIANCE
HIGGS MODEL
INVARIANCE PRINCIPLES
LEPTONS
LIE GROUPS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRINOS
PARTICLE DECAY
PARTICLE MODELS
POSTULATED PARTICLES
QUARK MODEL
QUARKS
STRING MODELS
SU GROUPS
SU-2 GROUPS
SU-3 GROUPS
SUPERSYMMETRY
SYMMETRY
SYMMETRY BREAKING
SYMMETRY GROUPS
U GROUPS
U-1 GROUPS
WEAK PARTICLE DECAY