Neutrino Mixing as a Probe of Grand Unification (CPの破れと物質生成)

概要

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The recent experimental measurements of the solar neutrino mixing angle θ_<sol> and the Cabibbo mixing angle θ_C reveal a surprising relation, θ_<sol>+θ_C≃π/4. We show that this empirical relation can be interpreted as a support of the idea of grand unification. In particular, we emphasis that the lepton mixing matrix derived from quark-lepton unification can lead to a shift of the complementarity relation at low energy. While the renormalization group effects generally lead to additive contribution on top of the shift, we discuss that the threshold corrections which may exist in some intermediate scale new physics such as supersymmetric standard model can diminish it, so we can achieve the complementarity relation at a low energy. Finally, we present a possibility to achieve the complementarity relation at a high energy by taking particular form of non-symmetric form of down Yukawa matrix.
素粒子論グループ素粒子研究編集部の論文
2005-08-20