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arXiv 1201.3604hep-thhep-ph
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D6-branes-T6/Z6 '上标准模型的Yukawa耦合和非手征态质量

Yukawa couplings and masses of non-chiral states for the Standard Model on D6-branes on T6/Z6'

Gabriele Honecker, Joris Vanhoof

摘要:

计算了T6/Z6'上分数D ~ 6-膜上隐藏USp(6)的标准模型的首阶开弦三点耦合的微扰.给出了由全纯Wilsonian超势项乘以涉及相应经典开弦Kaehler度量的非全纯前因子组成的物理Yukawa耦合,并导出了所有非手征物质态的质量项.轻子汤川相互作用是在领先的顺序味对角,而夸克部门显示出更复杂的模式的混合。N=2的超对称扇区只通过两个D 6膜位移获得质量--这也提供了一个夸克或轻子生成中上型和下型Yukawas之间的层次结构--其余的类矢量态通过微扰三点耦合获得质量,这些微扰三点耦合到一些标准模型单重场,这些单重场的vev沿平坦方向。简要讨论了超对称破缺的隐扇区耦合和信使。

英文摘要:

The perturbative leading order open string three-point couplings for the Standard Model with hidden USp(6) on fractional D6-branes on T6/Z6' from arXiv:0806.3039 [hep-th], arXiv:0910.0843 [hep-th] are computed. Physical Yukawa couplings consisting of holomorphic Wilsonian superpotential terms times a non-holomorphic prefactor involving the corresponding classical open string Kaehler metrics are given, and mass terms for all non-chiral matter states are derived. The lepton Yukawa interactions are at leading order flavour diagonal, while the quark sector displays a more intricate pattern of mixings. While N=2 supersymmetric sectors acquire masses via only two D6-brane displacements - which also provide the hierarchies between up- and down-type Yukawas within one quark or lepton generation -, the remaining vector-like states receive masses via perturbative three-point couplings to some Standard Model singlet fields with vevs along flat directions. Couplings to the hidden sector and messengers for supersymmetry breaking are briefly discussed.

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