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arXiv 0909.3887hep-phhep-th
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软壁AdS/QCD中共振介子质量谱的修正五维度规预测

Prediction for the Mass Spectra of Resonance Mesons in the Soft-Wall AdS/QCD with a Modified 5D Metric

Yan-Qin Sui, Yue-Liang Wu, Zhi-Feng Xie, Yi-Bo Yang

摘要:

构造了一个在红外区具有修正的五维度规的软壁anti-de Sitter/QCD模型,得到了一个包含手征对称性破缺和线性禁闭的非平凡的狄龙解.以π介子质量和衰变常数作为输入质量标度,对赝标、标量、矢量和轴矢量介子的共振态的预言与实验证实的共振态有很好的一致性.为了保持体标量势的稳定性,通过选取适当的符号和大小,研究了四次相互作用项的影响。结果表明,这种简单修改的软壁反de Sitter/QCD模型可以对赝标、标量、矢量和轴矢量介子的共振态的质量谱作出一致的预测,对激发态的质量谱,与实验值的符合率优于10%.得到的π形状因子也与实验数据吻合得很好。

英文摘要:

A soft-wall anti-de Sitter/QCD model with a modified five-dimensional metric at the infrared region is constructed to obtain a nontrivial dilaton solution, which incorporates the chiral symmetry breaking and linear confinement. By taking the pion mass and decay constant as two input mass scales, the resulting predictions for the resonance states of pseudoscalar, scalar, vector and axial-vector mesons agree remarkably with the experimentally confirmed resonance states. The effects of the quartic interaction term are investigated by taking an appropriate sign and magnitude for maintaining the stability of the bulk scalar potential. It is shown that such a simply modified soft-wall anti-de Sitter/QCD model can lead to a consistent prediction for the mass spectra of resonance states in the pseudoscalar, scalar, vector and axial-vector mesons; the agreement with the experimental data is found to be better than 10% for the excited meson states. The resulting pion form factor also agrees well with the experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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