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题名: Searching for realistic 4d string models with a Pati-Salam symmetry. Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold
作者: Kobayashi, T ;  Raby, S ;  Zhang, RJ
刊名: NUCLEAR PHYSICS B
出版日期: 2005
卷号: 704, 期号:40910, 页码:3-55
关键词: 3-GENERATION SUPERSTRING MODEL ;  CONTINUOUS WILSON LINES ;  FAYET-ILIOPOULOS TERMS ;  GAUGE COUPLINGS ;  THRESHOLD CORRECTIONS ;  YUKAWA COUPLINGS ;  STANDARD MODEL ;  ANOMALY CANCELLATION ;  LOOP CORRECTIONS ;  FIELD-THEORY
学科分类: Physics
通讯作者: Kobayashi, T , Kyoto Univ, Dept Phys, Kyoto 6068502, Japan.
部门归属: Kyoto Univ, Dept Phys, Kyoto 6068502, Japan; Ohio State Univ, Dept Phys, Columbus, OH 43210 USA; Univ Michigan, Randall Lab, Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: Motivated by orbifold grand unified theories, we construct a class of three-family Pati-Salam models in a Z(6) Abelian symmetric orbifold with two discrete Wilson lines. These models have marked differences from previously-constructed three-family models in prime-order orbifolds. In the limit where one of the six compactified dimensions (which lies in a Z(2) sub-orbifold) is large compared to the string length scale, our models reproduce the supersymmetry and gauge symmetry breaking pattern of 5d orbifold grand unified theories on an S-1/Z(2) orbicircle. We find a horizontal 2 divided by 1 splitting in the chiral matter spectra-2 families of matter are localized on the Z(2) orbifold fixed points. and 1 family propagates in the 5d bulk-and identify them as the first-two and third families. Remarkably. the first two families enjoy a non-Abelian dihedral D-4 family symmetry. due to the geometric setup of the compactified space. In all our models there are always some color triplets. i.e.. (6.1.1) representations of the Pati-Salam group, survive orbifold projections. They could be utilized to spontaneously break the Pati-Salam symmetry to that of the Standard Model. One model. with a 5d E-6 symmetry. may give rise to interesting low energy phenomenology. We study gauge coupling unification. allowed Yukawa couplings and some of their phenomenological consequences. The E-6 model has a renormalizable Yukawa coupling only for the third family. It predicts a gauge-Yukawa unification relation at the 5d compactification scale, and is capable of generating reasonable quark/lepton masses and mixings. Potential problems are also addressed, they may point to the direction for refining our models. (C) 2004 Elsevier B.V. All rights reserved.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000226217700001
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内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13907
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Kobayashi, T,Raby, S,Zhang, RJ. Searching for realistic 4d string models with a Pati-Salam symmetry. Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold[J]. NUCLEAR PHYSICS B,2005,704(40910):3-55.
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