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

Details On the Quark and Gluon Substructure of the Sigma and other Scalar Mesons On the Quark and Gluon Substructure of the Sigma and other Scalar Mesons

2000-09-10

arxiv.org/abs/hep-ph/0009108v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex2e sources 8 pages including 1 Table + espcrc1.sty file. Plenary talk given at the Workshop on `` Possible existence of t

Scientific paper

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.

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