Single and double seesaw for quark-lepton and neutrino masses
Abstract
A left-right model of quarks and leptons based on the gauge group SU(3)c × SU(2)L × SU(2)R × U(1)B-L is studied. Here the scalar sector consists of only two doublets namely (1,2,1,1) and (1,1,2,1) but familiar bidoublet (1,2,2,0) is removed. Quarks and charged leptons get mass from a single see-saw mechanism but neutrinos get mass from a double see-saw mechanism. In this type of models the heaviest right handed neutrino can be of order 1013 GeVs or less in a natural way, depending on the size of related Yukawa couplings.
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