Majorana CP Violation in Approximately μ-τ Symmetric Models with det(M_ν)=0(Particles and Fields)

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概要

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• We discuss effects of Majorana CP violation in a model-independent way for a given phase structure of flavor neutrino masses. To be more predictive, we confine ourselves to models with det(M_ν)=0, where M_ν is a flavor neutrino mass matrix, and to be consistent with observed results of the neutrino oscillation, the models are subject to an approximate μ-τ symmetry. There are two categories of approximately μ-τ symmetric models classified as (C1) yielding sin^22θ_<23>≈1 and sin^2θ_<13>≪1 and (C2) yielding sin^22θ_<23>≈1 and Δm^2_⦿/|Δm^2_&atm;|≪1, where θ_<23(13)> stands for the mixing of massive neutrinos ν_2 and ν_3 (ν_1 and ν_3) and Δm^2_⦿(Δm^2_&atm;) stands for the mass squared difference for atmospheric (solar) neutrinos. The Majorana phase can be large for the normal mass hierarchy and for the inverted mass hierarchy with m_1≈-m_2 only realized in (C1) while they are generically small for the inverted mass hierarchy with m_1≈m_2 in both (C1) and (C2). These results do not depend on a specific choice of phases in M_ν but hold true in any models with det(M_ν)=0 because of the rephasing invariance.

• 2010-04-25

著者

• BABA Teppei

  Department of Physics, Tokai University

• YASUE Masaki

  Department of Physics, Tokai University

• Baba Teppei

  Department Of Physics Tokai University

• Yasue Masaki

  Department Of Physics Tokai University

• Yasue Masaki

  Department Of Natural Science School Of Marine Science And Technology Tokai University:department Of

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