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Fermion doubling and a natural solution of the strongCPproblem
1994
Physical Review D, Particles and fields
We suggest the fermion doubling for all quarks and leptons. It is a generalization of the neutrino doubling of the seesaw mechanism. The new quarks and leptons are SU(2) singlets and carry the electromagnetic charges of their lighter counterparts. An SU(3) anomaly free global symmetry or a discrete symmetry can be introduced to restrict the Yukawa couplings. The form of mass matrix is belonging to that of Nelson and Barr even though our model does not belong to Barr's criterion. The weak CP
doi:10.1103/physrevd.50.2218
pmid:10017850
fatcat:vnuwj6rtyjbnzad7quzbfpumom