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Can the SO(10) model with one 10 and one 126 Higgs scalar give the observed masses and mixings of quarks and leptons without any other additional Higgs scalars? Recently, at least for quarks and charged leptons, it has been demonstrated that this is possible. However, for neutrinos, it is usually said that the parameters that are determined from the quark and charged lepton masses cannot give the observed large neutrino mixings. This problem is systematically investigated, and it is concluded that the present data cannot exclude the SO(10) model with two Higgs scalars although this model cannot give the best fit values of the data.
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Matsuda et al. (2002) studied this question.
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