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)'
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), Vol. 4:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOSONS
GAUGE INVARIANCE
SUPERSYMMETRY
STRING MODELS
SYMMETRY BREAKING
COMPACTIFICATION
ELECTRON NEUTRINOS
FOUR-DIMENSIONAL CALCULATIONS
HIGGS MODEL
QUARKS
SU-2 GROUPS
SU-3 GROUPS
U-1 GROUPS
WEAK PARTICLE DECAY
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
INVARIANCE PRINCIPLES
LEPTONS
LIE GROUPS
MASSLESS PARTICLES
MATHEMATICAL MODELS
NEUTRINOS
PARTICLE DECAY
PARTICLE MODELS
POSTULATED PARTICLES
QUARK MODEL
SU GROUPS
SYMMETRY
SYMMETRY GROUPS
U GROUPS
645300* - High Energy Physics- Particle Invariance Principles & Symmetries
645203 - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties
645400 - High Energy Physics- Field Theory