Searching for realistic 4d string models with a Pati-Salam symmetry. Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold

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	Searching for realistic 4d string models with a Pati-Salam symmetry. Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold
	Kobayashi, T; Raby, S; Zhang, RJ; Kobayashi, T , Kyoto Univ, Dept Phys, Kyoto 6068502, Japan.
刊名	NUCLEAR PHYSICS B
	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
ISSN号	0550-3213
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.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000226217700001
公开日期	2012-08-30
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/13907]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Kobayashi, T , Kyoto Univ, Dept Phys, Kyoto 6068502, Japan.
推荐引用方式 GB/T 7714	Kobayashi, T,Raby, S,Zhang, RJ,et al. 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.
APA	Kobayashi, T,Raby, S,Zhang, RJ,&Kobayashi, T , Kyoto Univ, Dept Phys, Kyoto 6068502, Japan..(2005).Searching for realistic 4d string models with a Pati-Salam symmetry. Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold.NUCLEAR PHYSICS B,704(40910),3-55.
MLA	Kobayashi, T,et al."Searching for realistic 4d string models with a Pati-Salam symmetry. Orbifold grand unified theories from heterotic string compactification on a Z(6) orbifold".NUCLEAR PHYSICS B 704.40910(2005):3-55.