On the Quark and Gluon Substructure of the σ and Other Scalar Mesons(§4. Meson Spectroscopy and Quark Model,Possible Existence of the σ-Meson and Its Implications to Hadron Physics)
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概要
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Within the increasing experimental evidence of the existence of the I = 0 scalar low mass and wide σ meson, we review the 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 u^^-u + d^^-d and of gg in its wave function, which make the wide σ and the narrow f_0(980) as η'-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 u^^-d state, and the K^*_0 (1430) its d^^-s partner.
- 素粒子論グループ 素粒子研究編集部の論文
- 2001-02-20