English

U(1)' Symmetry Breaking in Supersymmetric E6 Models

High Energy Physics - Phenomenology 2009-10-31 v2

Abstract

We study the electroweak and U(1)U(1)^{'} symmetry breaking patterns in models with the particle content of supersymmetric E6E_{6}, including standard model singlets SS and exotic quarks D, DˉD,~\bar{D}. Motivated by free fermionic string models, we do not require E6E_{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 SS and Higgs doublets, and between SS and the exotic quarks, allowing radiative U(1)U(1)^{'} symmetry breaking and the generation of an effective μ\mu parameter at the electroweak scale. For both the E6E_{6} ψ\psi and η\eta 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 MZM_{Z^{'}} and the ZZZ-Z^{'} mixing angle. In addition, by varying the U(1)U(1)^{'} charge assignments due to the mixing of U(1)χU(1)_{\chi} and U(1)ψU(1)_{\psi} of E6E_{6}, it is possible to have acceptable low energy phenomenology with universal boundary conditions.

Keywords

Cite

@article{arxiv.hep-ph/9804428,
  title  = {U(1)' Symmetry Breaking in Supersymmetric E6 Models},
  author = {Paul Langacker and Jing Wang},
  journal= {arXiv preprint arXiv:hep-ph/9804428},
  year   = {2009}
}

Comments

24 pages, 6 figures, 4 tables, LaTex; minor revision of the numerical results, typos corrected, reference added