Constraint on the heavy sterile neutrino mixing angles in the SO(10) model with double see-saw mechanism |
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Authors: | T Fukuyama T Kikuchi K Matsuda |
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Institution: | (1) Department of Physics, Ritsumeikan University, Kusatsu Shiga, 525-8577, Japan;(2) Theory Division, KEK, Oho 1-1, Tsukuba Ibaraki, 305-0801, Japan;(3) Department of Physics, Oklahoma State University, Stillwater, OK 74078, USA;(4) Center for High Energy Physics, Tsinghua University, Beijing, 100084, China |
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Abstract: | Constraints on the heavy sterile neutrino mixing angles are studied in the framework of a minimal supersymmetric SO(10) model
with the use of the double see-saw mechanism. A new singlet matter in addition to the right-handed neutrinos is introduced
to realize the double see-saw mechanism. The light Majorana neutrino mass matrix is, in general, given by a combination of
those of the singlet neutrinos and the active neutrinos. The minimal SO(10) model is used to give an example form of the Dirac
neutrino mass matrix, which enables us to predict the masses and the mixing angles in the enlarged 9×9 neutrino mass matrix.
Mixing angles between the light Majorana neutrinos and the heavy sterile neutrinos are shown to be within the LEP experimental
bound on all ranges of the Majorana phases. |
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