E_6 Unification, Doublet-Triplet Splitting and Anomalous U(1)_A Symmetry
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概要
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We propose a natural Higgs sector in E_6 grand unified theory (GUT) with anomalous U(1)_A gauge symmetry. In this scenario, the doublet-triplet splitting can be realized, while proton decay via dimension 5 operators is suppressed. Gauge coupling unification is also realized without fine-tuning. The GUT scale obtained in this scenario is generally lower than the usual GUT scale, 2 × 10^<16> GeV, and therefore it should be possible to observe proton decay via dimension 6 operators in near future experiments. The lifetime of a nucleon in this model is roughly estimated τp(P→e^+π^0) 〜3 × 10^<33> years. It is shown that the Higgs sector is compatible with the matter sector proposed by one of the present authors, which reproduces realistic quark and lepton mass matrices, including a bi-large neutrino mixing angle. Combining the Higgs sector and the matter sector, we can obtain a completely consistent E_6 GUT. The input parameters for this model are only eight integer anomalous U(1)_A charges (+3 for singlet Higgs) for the Higgs sector and three (half) integer charges for the matter sector.
- 理論物理学刊行会の論文
- 2002-06-25
著者
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Yamashita Toshifumi
Department Of Physics Kyoto University
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Maekawa N
名古屋大学大学院理学研究科
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Maekawa Nobuhiro
Department Of Anesthesia And Perioperative Medicine Kobe University
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MAEKAWA Nobuhiko
Department of Physics, Kyoto University
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MAEKAWA Nobuhiro
Department of Physics. Kyoto University
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MAEKAWA Nobuhiro
Departinrnt of Physics, Kyoto University
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