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arXiv 0903.4029hep-ph
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包含瞬子的QCD求和规则中的轻标量介子

Light scalar mesons in QCD sum rules with inclusion of instantons

J. Zhang, H. Y. Jin, Z. F. Zhang, T. G. Steele, D. H. Lu

摘要:

1GeV以上的轻标量介子九能级({ \it} $a_{0}$、$K^{\ast}_{0}$和$f_{0}$)的量子力学性质。在传统的QCD求和规则中,这种九元态的质量是简并的,并且$K^{\ast}_{0}$的质量总是大于$a_{0}$的质量,这与观测到的谱相矛盾。通过引入瞬子效应改进了关联函数,质量得到了很好的分离。特别是,我们的研究结果表明胶球含量起着重要的作用,在$f_{0}(1500)$的底层结构。并对衰变常数进行了讨论。

英文摘要:

The light scalar meson nonet above 1 GeV ({\it i.e.\}the $a_{0}$, $K^{\ast}_{0}$ and $f_{0}$) are studied within the framework of QCD sum rules. In conventional QCD sum rules, the calculated masses of this nonet are degenerate, and the mass of $K^{\ast}_{0}$ is always larger than the $a_{0}$ in contradiction with the observed spectrum. After improving the correlation function by including instanton effects, the masses are well separated from each other. In particular, our results shows glueball content plays an important role in the underlying structure of $f_{0}(1500)$. The decay constants are also discussed.

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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