19 research outputs found
U(1)' Symmetry Breaking in Supersymmetric E6 Models
We study the electroweak and symmetry breaking patterns in models
with the particle content of supersymmetric , including standard model
singlets and exotic quarks . Motivated by free fermionic string
models, we do not require -type relations between Yukawa couplings. In
particular, we assume that baryon and lepton numbers are conserved, so that the
exotic quarks can be light. Gauge invariance allows Yukawa interactions between
and Higgs doublets, and between and the exotic quarks, allowing
radiative symmetry breaking and the generation of an effective
parameter at the electroweak scale. For both the and
models, universal soft supersymmetry breaking parameters and Yukawa
universality at the high (string) scale do not yield acceptable low energy
phenomenology. Relaxing universality, we find solutions with phenomenologically
acceptable values of and the mixing angle. In addition,
by varying the charge assignments due to the mixing of
and of , it is possible to have acceptable low energy
phenomenology with universal boundary conditions.Comment: 24 pages, 6 figures, 4 tables, LaTex; minor revision of the numerical
results, typos corrected, reference adde