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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 ====== + + + <​hidden 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]] ​  | + | |