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We study the nature of the seesaw mechanism in the context of renormalizable SO(10) with Higgs fields in the 10-plets and 126̄-plet representations, paying special attention to the supersymmetric case. We discuss analytically the situation for the second and third generations of fermions ignoring any $CP$ violating phase. It is shown that b-τ unification and large atmospheric mixing angle strongly disfavor the dominance of the type I seesaw.
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Bajc et al. (2004) studied this question.
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