Coupling unifications in gauge-Higgs unified orbifold models
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
- School of Natural Sciences, Institute for Advanced Study, Einstein Drive, Princeton, New Jersey 08540 (United States)
- Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2 (Canada)
- Physics Department, Oklahoma State University, Stillwater, Oklahoma 74078 (United States)
Supersymmetric gauge theories, in higher dimensions compactified in an orbifold, give a natural framework to unify the gauge bosons, Higgs fields, and even the matter fields in a single multiplet of the unifying gauge symmetry. The extra dimensions and the supersymmetry are the two key ingredients for such an unification. In this work, we investigate various scenarios for the unification of the three gauge couplings and the Yukawa couplings in the minimal supersymmetric standard model (MSSM), as well as the trilinear Higgs couplings {lambda} and {kappa} of the nonminimal supersymmetric standard model (NMSSM). We present an SU(8) model in six dimensions with N=2 supersymmetry, compactified in a T{sup 2}/Z{sub 6} orbifold which unifies the three gauge couplings with {lambda} and {kappa} of NMSSM. Then we present an SU(9) model in 6D, which, in addition, includes partial unification of Yukawa couplings, either for the up-type (top quark and Dirac tau neutrino) or down-type (bottom quark and tau lepton). We also study the phenomenological implications of these various unification scenarios using the appropriate renormalization group equations and show that such unification works very well with the measured low energy values of the couplings. The predicted upper bounds for the lightest neutral Higgs boson mass in our model is higher than those in MSSM but lower than those in the general NMSSM (where the couplings {lambda} and {kappa} are arbitrary). Some of the predictions of our models can be tested in the upcoming Large Hadron Collider.
- OSTI ID:
- 20711476
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 72, Issue 5; Other Information: DOI: 10.1103/PhysRevD.72.055006; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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