### Abstract

We study the electroweak and U(1)′ symmetry breaking patterns in models with the particle content of supersymmetric E_{6}, including standard model singlets S and exotic quarks D, D̄. Motivated by free fermionic string models, we do not require E_{6}-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 S and Higgs doublets, and between S and the exotic quarks, allowing radiative U(1)′ symmetry breaking and the generation of an effective μ parameter at the electroweak scale. For both the E_{6} ψ and η 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 M_{Z′} and the Z-Z′ mixing angle. In addition, by varying the U(1)′ charge assignments due to the mixing of U(1)_{χ} and U(1)_{ψ} of E_{6}, it is possible to have acceptable low energy phenomenology with universal boundary conditions.

Original language | English (US) |
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Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 58 |

Issue number | 11 |

State | Published - Dec 1 1998 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)

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## Cite this

_{6}models.

*Physical Review D - Particles, Fields, Gravitation and Cosmology*,

*58*(11).