Fermion masses and mixing in extended technicolor models
Aug, 2003Citations per year
Abstract:
We study fermion masses and mixing angles, including the generation of a seesaw mechanism for the neutrinos, in extended technicolor (ETC) theories. We formulate an approach to these problems that relies on assigning right-handed quarks and charged leptons to ETC representations that are conjugates of those of the corresponding left-handed fermions. This leads to a natural suppression of these masses relative to the quarks, as well as the generation of quark mixing angles, both long-standing challenges for ETC theories. Standard-model-singlet neutrinos are assigned to ETC representations that provide a similar suppression of neutrino Dirac masses, as well as the possibility of a realistic seesaw mechanism with no mass scale above the highest ETC scale of roughly TeV. A simple model based on the ETC group SU(5) is constructed and analyzed. This model leads to non-trivial, but not realistic mixing angles in the quark and lepton sectors. It can also produce sufficiently light neutrinos, although not simultaneously with a realistic quark spectrum. We discuss several aspects of the phenomenology of this class of models.Note:
- 74 pages, revtex with embedded figures Journal-ref: Phys. Rev. D 69, 015002 (2004)
- 14.60.Pq
- 12.60.Nz
- 14.60.St
- technicolor
- fermion: mass
- fermion: mixing
- seesaw model
- group theory: representation
- gauge field theory: SU(5) x SU(2)
- hypercolor
References(101)
Figures(0)