Neutrino Masses and Large Mixings as a Indirect Signature of Grand Unified Theory

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  • 大統一理論の間接的な証拠としてのニュートリノ質量と大混合角 （解説）
  • 大統一理論の間接的な証拠としてのニュートリノ質量と大混合角
  • ダイ トウイツ リロン ノ カンセツテキ ナ ショウコ ト シテ ノ ニュートリノ シツリョウ ト ダイ コンゴウカク

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Abstract

Grand unified theory (GUT) unifies not only three forces (electromagnetic force, strong force and weak force) but also quarks and leptons. As an experimental support for the unification of forces, it is well-known that three gauge couplings meet at a scale (the GUT scale). However, it is not so well-known that there is an experimental support even for the unification of matters (quarks and leptons). We explain the indirect support in this document and show that the important key is what the neutrino experiments have revealed for 20 years. Concretely, for the unification of matters in SU(5) GUT, various observed hierarchies of quark and lepton masses and mixings can be understood only from one assumption that "10 dimensional fields of SU(5) induce stronger hierarchy for the Yukawa couplings than 5^^- fields". For this explanation, the knowledges on neutrino masses and mixings are critical. In the end, we comment E_6, unification in which the above assumption in the SU(5) GUT can be induced.

Journal

  • Butsuri

    Butsuri 70 (6), 427-435, 2015-06-05

    The Physical Society of Japan

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