arXiv 1202.20732012-02hep-thhep-ph

开弦轴子和味问题

Open string axions and the flavor problem

David Berenstein, Erik Perkins

备注：: 30 pages, 2 figures. v2: references added. v3:typos fixed
DOI：: 10.1103/PhysRevD.86.026005

摘要：

我们考虑扩展的标准模型的启发交叉D-膜结构，以解决风味质量纹理。我们包括额外的反常规范对称性，和标量场打破他们，并产生Froggatt-Nielsen质量条款。Green-Schwarz轴子被包括在内，以消除混合异常，使模型一致。在低能量下，剩余的反常整体对称性仍然存在，与之相关的伪戈德斯通模式成为物理轴子，它可以被解释为从开弦模式产生的轴子。一般的考虑表明，这样的轴子在D膜模型中非常常见，并且可以与当前的边界完全不相容。天体物理的限制被放置在轴子都包括中微子质量的Froggatt-Nielsen计划，并考虑QCD瞬子贡献的轴子质量。我们发现简单的模型中的轴子衰变常数是在允许的范围内，但只有一个这样的极小模型与此属性是免费的过度微调其他地方。我们还注意到，一般解决CKM矩阵的风味纹理导致解构额外的维度。

英文摘要：

We consider extensions of the standard model inspired by intersecting D-brane constructions, in order to address flavor mass textures. We include additional anomalous gauge symmetries, and scalar fields to break them and to generate Froggatt-Nielsen mass terms. Green-Schwarz axions are included to cancel mixed anomalies rendering the models consistent. At low energies, a residual anomalous global symmetry remains, and its associated pseudo-Goldstone mode becomes the physical axion, which can be interpreted as an axion arising from open string modes. General considerations show that such axions are very common in D-brane models and can be completely incompatible with current bounds. Astrophysical constraints are placed on the axion both by including neutrino masses in the Froggatt-Nielsen scheme and considering QCD instanton contributions to the axion mass. We find simple models where the axion decay constant is in the allowed range, but only one such minimal model with this property is free from excessive fine tunings elsewhere. We also note that generically addressing flavor textures for the CKM matrix leads to deconstructed extra dimensions.

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