@article{oai:aue.repo.nii.ac.jp:00004833,
 author = {Haba, Naoyuki and Hattori, Chuichiro and Matsuda, Masahisa and Matsuoka, Takeo and Mochinaga, Daizo},
 issue = {1},
 journal = {Progress of theoretical physics},
 month = {},
 note = {text, In a certain type of Calabi-Yau superstring models it is clarified that the symmetry breaking occurs by stages at two large intermediate energy scales and that two large intermediate scales induce large Majorana-masses of righthanded neutrinos. Peculiar structure of the effective nonrenormalizable interactions is crucial in the models. In this scheme Majorana-masses possibly amount to O(10^9∼^<10>GeV) and see-saw mechanism is at work for neutrinos. Based on this scheme we propose a viable model which explains the smallness of masses for three kind of neutrinos ν_e, ν_μ and ν_τ . Special forms of the nonrenormalizable interactions can be understood as a consequence of an appropriate discrete symmetry of the compactified manifold.},
 pages = {153--174},
 title = {How can we obtain a large Majorana-mass in Calabi-Yau models?},
 volume = {92},
 year = {1994}
}