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arXiv 1104.2264hep-phhep-th
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外疏Pati-Salam杂化弦模型中的顶夸克质量

Top Quark Mass in Exophobic Pati--Salam Heterotic String Model

Kyriakos Christodoulides, Alon E. Faraggi, John Rizos

摘要:

我们分析了一个典型的外疏Pati-Salam异质弦真空的现象,其中没有外来的分数带电状态存在于无质量弦谱。我们的模型还包含了希格斯表象,这些表象是打破规范对称性到标准模型的对称性和在电弱尺度下产生费米子质量所必需的。我们表明,一个领先的质量项的要求,重一代,这是不退化的质量条款的较轻的世代,地方一个额外的强有力的约束模型的可行性。在许多模型中,汤川顶夸克可能根本不存在,而在另一些模型中,两代或更多代的汤川顶夸克可能会在首阶获得质量项。在我们的示例性模型中,领先顺序的大量术语仅存在于一个家族中。此外,我们证明了超对称F-和D-平坦方向的存在,使重质量的所有颜色的三重态超出了标准模型,并留下一对电弱希格斯二重态光。因此,在Pati-Salam破缺标度之下,我们模型中在可观测的规范对称性下带电的物质态,只由最小超对称标准模型的物质态组成。

英文摘要:

We analyse the phenomenology of an exemplary exophobic Pati-Salam heterotic string vacuum, in which no exotic fractionally charged states exist in the massless string spectrum. Our model also contains the Higgs representations that are needed to break the gauge symmetry to that of the Standard Model and to generate fermion masses at the electroweak scale. We show that the requirement of a leading mass term for the heavy generation, which is not degenerate with the mass terms of the lighter generations, places an additional strong constraint on the viability of the models. In many models a top quark Yukawa may not exist at all, whereas in others two or more generations may obtain a mass term at leading order. In our exemplary model a mass term at leading order exist only for one family. Additionally, we demonstrate the existence of supersymmetric F- and D-flat directions that give heavy mass to all the colour triplets beyond those of the Standard Model and leave one pair of electroweak Higgs doublets light. Hence, below the Pati-Salam breaking scale, the matter states in our model that are charged under the observable gauge symmetries, consist solely of those of the Minimal Supersymmetric Standard Model.

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