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arXiv 0804.2710hep-ph
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超越领先订单的全息QCD

Holographic QCD beyond the leading order

Youngman Kim, P. Ko, Xiao-Hong Wu

摘要:

在AdS $_5$空间中,在区间上的5维线性西格玛模型的背景下,考虑了首阶以上轻介子的全息QCD模型.我们在正则体动力学项的基础上加入了两个6维算符,研究了$π$,$ρ$,$a_1$及其部分KK模的手征动力学.作为dim-6算符的新特征,我们得到了非零的Br $(a_1 \to πγ)$,带电π介子的电磁形状因子和电荷半径,这些结果显著改善了前阶结果,并与实验结果符合得很好.

英文摘要:

We consider a holographic QCD model for light mesons beyond the leading order in the context of 5-dim gauged linear sigma model on the interval in the AdS$_5$ space. We include two dimension-6 operators in addition to the canonical bulk kinetic terms, and study chiral dynamics of $π$, $ρ$, $a_1$ and some of their KK modes. As novel features of dim-6 operators, we get non-vanishing Br$(a_1 \to πγ)$, the electromagnetic form factor and the charge radius of a charged pion, which improve the leading order results significantly and agree well with the experimental results.

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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