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[en] A general idea is proposed according to which the gauge symmetries of grand unified models can restrict the Yukawa couplings in such a way as to make arg det M/sub Q/ naturally small (where M/sub Q/ is the quark mass matrix). A specific example model based on SU(6) is discussed in detail. It has q< or approx. =10-9, is economical of fields, and involves no discrete symmetries or new horizontal gauge symmetries. It suffers from the gauge hierarchy problem. However, the smallness of q is natural
Journal
Physical Review. D, Particles Fields; ISSN 0556-2821; 
; v. 23(10); p. 2434-2443
; v. 23(10); p. 2434-2443