Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-10
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 1 figure
Scientific paper
In the left-right symmetric models, we can take the left-right symmetry to be the charge-conjugation and then impose a global symmetry under which the left- and right-handed fermion doublets carry equal but opposite charges. Consequently, we may introduce two Higgs bi-doublets to give the desired fermion mass spectrum. The global symmetry is identified to a Peccei-Quinn symmetry. We can introduce a complex scalar singlet to break the global Peccei-Quinn symmetry at a high scale. This symmetry breaking is also responsible for generating the heavy Majorana masses of the fermion singlets which have Yukawa couplings with the lepton and Higgs doublets. In this context, we can realize the double and linear seesaw to naturally explain the small neutrino masses. Our scenario can be embedded in the SO(10) grand unification theories.
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