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

TL;DR

This paper proposes a universal seesaw mechanism within left-right symmetric models, linking fermion mass generation to Peccei-Quinn symmetry breaking, and discusses implications for leptogenesis and neutrino types.

Contribution

It introduces a novel connection between universal seesaw, left-right symmetry, and Peccei-Quinn symmetry breaking, with a detailed mechanism for fermion mass generation.

Findings

Fermion singlets gain mass from global symmetry breaking.

The global symmetry is identified as Peccei-Quinn symmetry.

The model accommodates leptogenesis with Majorana or Dirac neutrinos.

Abstract

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.