Leptogenesis in seesaw models with a two-fold-degenerate neutrino Dirac mass matrix

被引:41
作者
Grimus, W
Lavoura, L
机构
[1] Univ Vienna, Inst Theoret Phys, A-1090 Vienna, Austria
[2] Univ Tecn Lisboa, Inst Super Tecn, Ctr Fis Interaccoes Fundamentais, P-1049001 Lisbon, Portugal
关键词
D O I
10.1088/0954-3899/30/9/008
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
We study leptogenesis in two seesaw models where maximal atmospheric neutrino mixing and U-e3 = 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 neutrinoless double beta decay depend on the same unique Majorana phase. Leptogenesis can produce a baryon asymmetry of the universe of the right size provided the mass of the heavy neutrino whose decays generate the lepton asymmetry is in the range 10(11)-10(12) GeV. Moreover, in these models, leptogenesis precludes an inverted neutrino mass spectrum since it requires the mass of the lightest neutrino to be in the range 10(-3)10(-2) eV.
引用
收藏
页码:1073 / 1088
页数:16
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