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Leptogenesis in seesaw models with a two-fold-degenerate neutrino Dirac mass matrix
We study leptogenesis in two seesaw models where maximal atmospheric neutrino mixing and Ue3 = 0 result from symmetries. Salient features of those models are the existence of three Higgs doublets and a two-fold degeneracy of the neutrino Dirac mass matrix. We find that in those models both leptogenesis and …