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 — preprints:2002:ttp02-12 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP02-12 On the hierarchy of neutrino masses ====== + + +    We present a model of neutrino masses combining the seesaw mechanism and + strong Dirac mass hierarchy and at the same time exhibiting a significantly + reduced hierarchy at the level of active neutrino masses. The heavy Majorana + masses are assumed to be degenerate. The suppression of the hierarchy is due to + a symmetric and unitary operator R whose role is discussed. The model gives + realistic mixing and mass spectrum. The mixing of atmospheric neutrinos is + attributed to the charged lepton sector whereas the mixing of solar neutrinos + is due to the neutrino sector. Small U_e3 is a consequence of the model. The + masses of the active neutrinos are given by $\mu_3\approx\sqrt{\Delta m_{@}^2}$ + and $\mu_1/\mu_2\approx \tan^2\theta_\odot$. + + |**M. Jezabek and P. Urban**  | + |**  Acta Phys.Polon.  B33 2571-2584 2002  **  | + | {{preprints:2002:ttp02-12.pdf|PDF}} {{preprints:2002:ttp02-12.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0207018|arXiv]]   | + | |