Universal Seesaw from Left-Right and Peccei-Quinn Symmetry Breaking

Understand

To generate the lepton and quark masses in the left-right symmetric models, we can consider a universal seesaw scenario by integrating out heavy fermion singlets which have the Yukawa couplings with the fermion and Higgs doublets.

• The universal seesaw scenario can also accommodate the leptogenesis with Majorana or Dirac neutrinos.
• We show the fermion singlets can obtain their heavy masses from certain global symmetry breaking, which is driven by one complex scalar singlet or two.
• The global symmetry can be identified to the Peccei-Quinn symmetry since it is mediated to the standard model quarks at tree and/or loop level.