A Light Sterile Neutrino Based on the Seesaw Mechanism

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概要

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• We propose a simple model of the neutrino mass matrix that can explain the solar and atmospheric neutrino problems in a 3(ν_L+ν_R) framework. Assuming that only two right-handed neutrinos are heavy and a Dirac mass matrix has a special texture, we construct a model with four light neutrinos. The favorable structure of flavor mixings and mass eigenvalues required by these neutrino deficits is realized as a result of the seesaw mechanism. It is possible that bi-maximal mixing structure can be obtained in this scheme. Since it contains a light sterile neutrino, it may be capable of explaining the LSND result successfully. We consider an embedding of this scenario for the neutrino mass matrix into the SU(5) grand unification scheme using the Froggatt-Nielsen mechanism based on U(1)_<F_1> × U(1)_<F_2>. In this case, only a large mixing angle MSW solution is obtained for the solar neutrino problem as a consistent solution.

• 理論物理学刊行会の論文
• 2001-09-25

著者

• Suematsu D

  Kanazawa Univ.

• Suematsu Daijiro

  Institute For Theoretical Physics University Of Bern

• SUEMATSU Daijiro

  Department of Physics, Kanazawa University

• SUEMATSU Daijiro

  Institute for Theoretical Physics, Faculty of Science, Kanazawa University

• SUEMATSU Daijiro

  Institute for Theoretical Physics, University of Bern

• SUEMATSU Daijiro

  Institute for Theoretical Physics, Kanazawa University

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• A Light Sterile Neutrino Based on the Seesaw Mechanism

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