Fermion masses and mixing in extended technicolor models

Aug, 2003
75 pages
Published in:
  • Phys.Rev.D 69 (2004) 015002
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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 Q=1/3Q=-1/3 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 Q=2/3Q=2/3 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 10310^3 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