Chuichiro Hattori, Mamoru Matsunaga, Takeo Matsuoka
Fermion mass spectra and flavor mixings are studied in detail in the $SU(6) \times SU(2)_R$ model, in which state-mixings beyond the MSSM take place. Characteristic patterns of fermion spectra is attributed to the hierarchical structure of effective Yukawa interactions via the Froggatt-Nielsen mechanism and also to the state-mixings beyond the MSSM. It is found that the neutrino mass matrix in the mass diagonal basis for charged leptons has no hierarchical structure. This is due to the cancellation among the hierarchical factors by the seesaw mechanism with the hierarchical Majorana mass matrix of R-handed neutrinos. As a consequence, $V_{\rm MNS}$ exhibits large mixing. It is shown that a simple setting of parameters in the present model is consistent with all observed values of fermion masses and mixings.
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http://arxiv.org/abs/1210.3763
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