2002/02/28 by F. Buccella, F. BUCCELLA, C. A. Savoy +1
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1142/s0217732302007429
published as Mod.Phys.Lett.A17:1239-1248,2002 · LaTex, 9 pages
arxiv created 2002/02/28 · openalex publication_date 2002/06/21 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the supersymmetric spontaneous symmetry breaking of SO(10) into SU (3) ⊗ SU (2) ⊗ U (1) for the most physically interesting cases of SU(5) or flipped SU (5) ⊗ U (1) intermediate symmetries. The first case is more easily realized while the second one requires a fine-tuning condition on the parameters of the superpotential. This is because in the case of SU(5) symmetry there is at most one singlet of the residual symmetry in each SO(10) irreducible representation. We also point out on more general grounds in supersymmetric GUTs that some intermediate symmetries can be exactly realized and others can only be approximated by fine-tuning. In the first category, there could occur some tunneling between the vacua with exact and approximate intermediate symmetry. The flipped SU (5) ⊗ U (1) symmetry improves the unification of gauge couplings if (B-L) is broken by ‖(B-L)‖ =1 scalars yielding right-handed neutrino masses below 10 14 GeV .