标题： 关于Σ和其他标量介子的夸克和胶子亚结构 显示英文标题

标题： On the Quark and Gluon Substructure of the Sigma and other Scalar Mesons

摘要： 随着I=0标量低质量宽\sigma 介子存在的实验证据不断增加，我们回顾了从QCD谱求和规则和某些低能定理出发对其夸克和胶子亚结构的{\it 第一}分析。 目前的数据倾向于其波函数中等量的\bar uu +\bar dd和gg成分，这使得宽的sigma和窄的f_0(980)成为类似\eta '的粒子。 在这个混合方案内，我们简要讨论了其他I=0标量介子谱的连贯图景。 我们还预计a_0(980)是最轻的同位旋矢量\bar ud态，而K^*_0(1430)是其\bar ds伙伴。 显示英文摘要

摘要： Within the increasing experimental evidence of the existence of the I=0 scalar low mass and wide \sigma meson, we review the {\it first} analysis of its quark and gluon substructure from QCD spectral sum rules and some low-energy theorems. The present data favour equal components of \bar uu+ \bar dd and of gg in its wave function, which make the wide sigma and the narrow f_0(980) as \eta'-like particles. A coherent picture of the other I=0 scalar mesons spectra within this mixing scheme is shortly discussed. We also expect the a_0(980) to be the lowest isovector \bar ud state, and the K^*_0(1430) its \bar ds partner.