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arXiv 1604.02571hep-ph
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改进软壁AdS/QCD的手征相变和介子谱

Chiral phase transition and meson spectrum in improved soft-wall AdS/QCD

Zhen Fang, Yue-Liang Wu, Lin Zhang

摘要:

在改进的软壁AdS/QCD模型中,对体标量场的五维共形质量进行了简单的修正,详细研究了QCD的手征热跃迁。在此模型中,我们还计算了轻介子谱和其它低能特征量,包括π形状因子,π-ρ耦合常数,π,ρ,α_1的衰变常数,除π衰变常数外,与实验值符合得很好。研究了手性缩合物的热行为。结果表明,这种简单改进的软壁模型包含了晶格模拟所显示的手征热跃迁的交叉行为。得到了预期的手性转变温度。

英文摘要:

We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.

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