Chiral symmetry breaking from five-dimensional spaces
Chiral symmetry breaking from five-dimensional spaces
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DOI：
10.1016/j.nuclphysb.2005.05.009
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发表时间：
2005-01
期刊：
影响因子：
--
通讯作者：
L. Rold;A. Pomarol
中科院分区：
文献类型：
--
作者：
L. Rold;A. Pomarol
基于AdS/CFT对应，我们用一个简单的五维模型研究了QCD中手征对称性的破缺。该模型给出了明确的预测矢量介子的光谱，它们的衰变常数和相互作用作为一个参数的函数的夸克凝聚。我们计算了低能QCD手征拉格朗日量的系数Li，以及π介子的其他物理量。所有的预测结果都与实验数据吻合得很好。我们还表明，他们是强大的5D度规在IR的修改下，其中一些出现作为一个后果的高维规范对称性。例如，在树级，我们发现Mρ <$3g ρππFπ，Fρ <$3F π和BR（a1→πγ）=0。
Based on the AdS/CFT correspondence we study the breaking of the chiral symmetry in QCD using a simple five-dimensional model. The model gives definite predictions for the spectrum of vector mesons, their decay constants and interactions as a function of one parameter related to the quark condensate. We calculate the coefficients Liof the low-energy QCD chiral Lagrangian, as well as other physical quantities for the pions. All the predictions are shown to be in good agreement with the experimental data. We also show that they are robust under modifications of the 5D metric in the IR, and that some of them arise as a consequence of the higher-dimensional gauge symmetry. For example, at the tree-level, we find Mρ≃3gρππFπ, Fρ≃3Fπand BR(a1→πγ)=0.