Matter-Induced Neutrino Oscillation in Double Universal Seesaw Model : Particles and Fields

概要

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The Mikheyev-Smirnov-Wolfenstein effect is investigated in an extended gauge field theory in which the universal seesaw mechanism is applied singly to the charged fermion sectors to lower their masses below the electroweak energy scale and doubly to the neutral fermion sector to make neutrinos superlight. At the first seesaw approximation, neutrinos are proved to have a distinctive spectrum consisting of doubly degenerate states with smaller mass m_s and a singlet state with larger mass m_L. The lepton mixing matrix is determined definitely in terms of the masses of charged leptons and down quarks, with a very small vacuum mixing angle sinθ=0.043±0.004. The Schrodinger-like equation describing the spatial evolution of stationary neutrino flux is solved for globally-rotated-flavor wave functions. Comparison of its nonadiabatic solution with experimental results leads to an estimation m_L^2-m_S^2=(6±2)×10^<-6> eV^2 for the squared mass difference and a capture rate prediction of 74 ± 12 SNU for the SAGE gallium experiment.
理論物理学刊行会の論文
1992-04-25