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arXiv 0812.3218hep-ph
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AdS/QCD的软壁模型:轻标量介子的情况

Soft-wall model of AdS/QCD: The case of light scalar mesons

Fulvia De Fazio

摘要:

我们研究了具有背景介子场的AdS/QCD软壁模型中的轻标量介子,探讨了这种方法在强耦合区描述QCD性质的特点。我们发现,如果$a_0(980)$和$f_0(980)$被确定为最轻的标量介子,质量和衰变常数与实验和QCD确定是兼容的,而且,状态的线性Regge轨迹具有相同的矢量介子的斜率。标量态与轻赝标量介子对的强耦合很小,这与实验和QCD的估计不一致:这种差异与全息模型中手征对称性破缺的描述有关。

英文摘要:

We study light scalar mesons in the AdS/QCD soft-wall model with a background dilaton field, to investigate the features of this approach in describing QCD properties in the strong coupling regime. We find that the masses and decay constants are compatible with experiment and QCD determinations if $a_0(980)$ and $f_0(980)$ are identified as the lightest scalar mesons; moreover, the states are organized in linear Regge trajectories with the same slope of vector mesons. Strong couplings of scalar states to pairs of light pseudoscalar mesons turn out to be small, at odds with experiment and QCD estimates: this discrepancy is related to the description of chiral symmetry breaking in this holographic model.

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