Light scalar mesons in QCD sum rules with inclusion of instantons

Light scalar mesons in QCD sum rules with inclusion of instantons
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QCD 中的光标量介子求和规则,包含瞬子

DOI:
10.1103/physrevd.79.114033
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发表时间:
2009-03
期刊:
影响因子:
5
通讯作者:
Zhang, J.
Zhang, J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, Z. F.;Steele, T. G.;Jin, H. Y.;Lu, D. H.;Zhang, J.

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高于1GeV的轻标量介子九能级(即,a{sub 0},K{sub 0}* 和f{sub 0})的量子色动力学求和规则.在传统的QCD求和规则中,计算的质量是简并的,K{sub 0}* 的质量总是大于a{sub 0},这与观测的谱相矛盾。在通过包括瞬子效应来改进相关函数之后,质量彼此很好地分离。特别地,我们的结果表明胶球含量在f{sub 0}(1500)的底层结构中起着重要的作用。讨论了结果对瞬子密度的敏感性。
The light scalar meson nonet above 1 GeV (i.e., the a{sub 0}, K{sub 0}* and f{sub 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{sub 0}* is always larger than the a{sub 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 show glueball content plays an important role in the underlying structure of f{sub 0}(1500). The sensitivity of the results on the instanton density is also discussed.
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