Towards a systematic construction of realistic D-brane models on a del Pezzo singularity
Towards a systematic construction of realistic D-brane models on a del Pezzo singularity
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系统地构建德尔佩佐奇点上的真实 D 膜模型
DOI：
10.1007/jhep10(2011)024
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发表时间：
2011
影响因子：
5.4
通讯作者：
F. Quevedo
中科院分区：
文献类型：
--
作者：
M. Dolan;S. Krippendorf;F. Quevedo
一个系统的方法，以确定现实的D-膜模型在复曲面del Pezzo奇点。要求夸克和轻子谱和Yukawas从D3膜和无质量超荷，我们导致标准模型的Pati-Salam扩展。层次的质量，味道混合和控制的耦合选择高阶德尔佩佐奇点，最大限度地减少希格斯部门喜欢复曲面德尔佩佐与dP 3提供最成功的妥协。然后给出了一个超对称的局域弦模型，它在低能时具有以下性质：（i）MSSM谱加上一个局域B − L规范场或取决于破缺模式的附加Higgs场;（ii）夸克和轻子质量的真实层次;（iii）夸克和轻子族之间真实的味混合，具有可计算的CKM和PMNS矩阵，以及与观测一致的CP破坏。在这种结构中，动力学项是对角的，并且在计算控制下抑制标准FCNC贡献。4、5、6维的质子衰变算符被抑制，规范耦合可以统一，这取决于能量在1012-1016 GeV范围内的弦尺度的破缺尺度，与TeV软质量的模量介导的超对称破缺一致。大统一尺度模型对应于dP 3处的D3膜，具有两个Pati-Salam规范对称性SU（4）× SU（2）R × SU（2）L的副本。D膜瞬子产生一个非零的μ项。右手中微子可以打破B − L对称性，并诱导中微子质量和R宇称违反算符的跷跷板机制，具有可观察的低能影响。
A systematic approach is followed in order to identify realistic D-brane models at toric del Pezzo singularities. Requiring quark and lepton spectrum and Yukawas from D3 branes and massless hypercharge, we are led to Pati-Salam extensions of the Standard Model. Hierarchies of masses, flavour mixings and control of couplings select higher order del Pezzo singularities, minimising the Higgs sector prefers toric del Pezzos with dP3 providing the most successful compromise. Then a supersymmetric local string model is presented with the following properties at low energies: (i) the MSSM spectrum plus a local B − L gauge field or additional Higgs fields depending on the breaking pattern, (ii) a realistic hierarchy of quark and lepton masses and (iii) realistic flavour mixing between quark and lepton families with computable CKM and PMNS matrices, and CP violation consistent with observations. In this construction, kinetic terms are diagonal and under calculational control suppressing standard FCNC contributions. Proton decay operators of dimension 4, 5, 6 are suppressed, and gauge couplings can unify depending on the breaking scales from string scales at energies in the range 1012–1016 GeV, consistent with TeV soft-masses from moduli mediated supersymmetry breaking. The GUT scale model corresponds to D3 branes at dP3 with two copies of the Pati-Salam gauge symmetry SU(4) × SU(2)R × SU(2)L. D-brane instantons generate a non-vanishing μ-term. Right handed sneutrinos can break the B − L symmetry and induce a see-saw mechanism of neutrino masses and R-parity violating operators with observable low-energy implications.